INFAUNAL MACROINVERTEBRATES OF THE CHARLOTTE HARBOR ESTUARINE

SYSTEM AND SURROUNDING INSHORE WATERS, FLORIDA

By Ernest D. Estevez

U.S. GEOLOGICAL SURVEY

Water-Resources Investigations Report 85-4260

Prepared in cooperation with the

FLORIDA DEPARTMENT OF ENVIRONMENTAL REGULATION

Contract Number: 14-08-0001-A-0160 Name of Contractor: Mote Marine Laboratory Principal Investigator: Ernest D. Estevez Contract Officer's Representative: Benjamin F. McPherson Short Title of Work: Infaunal Macroinvertebrates Effective Date of Contract: September 27, 1983 Contract Expiration Date: August 27, 1984 Amount of Contract: $38,374 Date Report is Submitted: October 22, 1984

The views and conclusions contained in this document are those of the author and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government.

Tallahassee, Florida

1986 UNITED STATES DEPARTMENT OF THE INTERIOR

DONALD PAUL HODEL, Secretary

GEOLOGICAL SURVEY

Dallas L. Peck, Director

For additional information Copies of this report can be write to: purchased from:

District Chief U.S. Geological Survey U.S. Geological Survey Books and Open-File Reports Section Suite 3015 Federal Center, Bldg. 41 227 North Bronough Street Box 25425 Tallahassee, Florida 32301 Denver, Colorado 80225 (Telephone: (303) 236-7476) CONTENTS

Page

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Shoreline and subtidal environment 8 COcUXlUcIlLo 0/4 -ttnonl* c -. . __ __-_ -.______-. ______^1 ^9 Previous studies of benthic fauna 13 Methods of investigation 13

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III ILLUSTRATIONS

Page

Figures 1-2. Maps showing: 1. Charlotte Harbor estuarine system, southwest Florida 4 2. Drainage basins of the Myakka, Peace, and Caloosahatchee Rivers in Florida 5 3-4. Graphs showing: 3. Frequency distribution of river discharges to the study area 7 4. Seven-day average discharge of the Peace River at Arcadia, January through March 1981, and the 1980 water year (shaded) 9 5-12. Maps showing: 5. Bathymetry and location of sampling stations 11 6. Bottom salinity and dissolved oxygen, September 1980 19 7. Faunal density and equitability (J T ) in May and June 1980 28 8. Faunal density and equitability (J T ) in September 1980 29 9. Similarity of molluscan assemblages (Czekanowski's index) , in September 1980 33 10. Similarity of polychaete assemblages (Czekanowski's index) , in September 1980 34 11. Similarity of crustacean assemblages (Czekanowski's index), in September 1980 35 12. Hydrographic and infaunal subsystems of the Charlotte Harbor estuarine system 39

TABLES

Page

Table 1. Discharge of the Myakka, Peace, and Caloosahatchee Rivers for water year 1980 8 2. Location and description of sampling stations 14 3. Summary of water-quality data 18 4. Master list of species 20 5. Summary of faunal data by station 27 6. Frequency distribution of species commonality 30 7. Geographic subsystems of the study area 38

IV INFAUNAL MACROINVERTEBRATES OF THE CHARLOTTE HARBOR ESTUARINE SYSTEM AND SURROUNDING INSHORE WATERS, FLORIDA

By Ernest D. Estevez

ABSTRACT

The Charlotte Harbor estuarine system is situated between the mouths of the Myakka, Peace, and Caloosahatchee Rivers and coastal barrier islands. Most of the area is shallow (less than 2 meters) and the predominant benthic environment is sandy and unvegetated.

A total of 25 intertidal and subtidal stations were sampled during two seasons (May-June and September) in 1980 for benthic infauna, sediment, and hydrographic parameters. Nearly all the 48,513 specimens other than nemerteans, nematodes, and oligochaetes were identified to species.

Bottom sediments were similar throughout the area, except at inlets where they were coarser and at upper river stations where they were more organic. Bottom salinity and dissolved oxygen increased along a gradient toward the south and west, especially in September. Species number increased along the same gradient, but densities were highest at river mouths and Pine Island Sound (May-June) or in coastal Charlotte Harbor (September). The middle harbor is a transitional area along the gradient. It is affected by stratifi­ cation and near-anoxic bottom conditions. Six subsystems had characteristic hydrographic and faunal features that portray the system as an integrated, rather than sharply subdivided, environment. Seasonal trends within and among subsystems were evident, but not extreme, due to relatively dry conditions in 1980.

INTRODUCTION

Estuaries are complex transitional ecosystems between oceanic and riverine environments, noted for their high productivity of sport and commer­ cial fisheries. In addition, estuaries provide a unique and essential habitat for a wide range of plants and animals. Estuaries of the Florida west coast are facing increased development pressure and have become the center of several resource management controversies. Data needed for effective resource management are lacking for many Florida estuaries.

The Charlotte Harbor estuarine system is facing potential environmental problems because of projected large population growth in its basin. The Governor of Florida established a committee composed of local, regional, and State agencies to recommend the course of action that Florida should take in planning for this growth. The committee, through its Technical Advisory Committee (TAG), asked the U.S. Geological Survey to prepare a proposal and a plan of study for a comprehensive environmental assessment of the area. The Survey, in cooperation with the TAG, prepared the proposal in 1980 and the plan of study in 1981. Based on these documents and subsequent meetings, the Survey began a multidiscipline, 7-year study of the basin and estuarine system in 1982. Purpose and Scope

The overall objective of the Survey study is to describe existing conditions and evaluate the impact of future development on water-related resources of the estuarine system. Central to the objective is the relation between hydrodynamics and water quality. This report addresses one aspect of the study objective to evaluate the macroinvertebrate infauna of soft bottom environments of Charlotte Harbor and surrounding inshore waters. The report describes the sampling approach and results from a reconnaissance of macro- invertebrate infauna performed in 1980 by the Mote Marine Laboratory (MML). This compilation and analysis was undertaken by MML in cooperation with the U.S. Geological Survey and the Florida Department of Environmental Regulation. Specific objectives of the reconnaissance and report were:

1. To provide a listing of infaunal macroinvertebrates from soft bottom environments; 2. To assess the suitability of infaunal macroinvertebrate sampling methods; 3. To identify spatial and seasonal trends or patterns in benthic communi- tites and, where possible, relate these patterns to tidal locations, salinity, sediment type, and other environmental parameters.

The 1980 benthic project was limited to the infauna of unvegetated soft bottoms (for example oyster reefs and seagrass beds were not sampled).

Acknowledgments

The science of benthic community ecology involves numerous persons in collection, sorting, taxonomy, and data processing. The author takes respon­ sibility for design and interpretation of this study but gratefully extends credit to these individuals who made it possible.

Sample collection: K. Caraccia, J. Enrico, P. Hull, L. McCann, T. Russell, R. Tegencamp, R. Yarbrough;

Sorting: G. Blanchard, R. Buhler, K. Burns, I. Dodson, E. Kinney, D. McCallum, J. Valentine, S. Wilkinson;

Taxonomy and sediments: J. Culter, D. Devlin, J. Leverone, R. Lee, N. Maddox, J. Mapes, M. Milligan, K. Molar;

Data and text processing: G. Blanchard, L. DeAnna, B. Fortune, L. Franklin, L. Fraser, B. Hussey, D. Latulippe, M. Spring.

Benjamin F. McPherson of the U.S. Geological Survey is acknowledged for his assistance during report preparation. K. Mahadevan and G. Blanchard made useful criticisms of early drafts. The 1980 sampling trips were sponsored by Mote Marine Laboratory. Study Area

Regional Physiography

The Charlotte Harbor estuary and connected inshore waters are formed by the drowned flood plains of three rivers and their associated coastal lagoons (fig. 1). Charlotte Harbor proper (excluding Matlacha Pass and Pine Island Sound) occupies an area of 493 km2 at mean high water; total area of the Myakka, Peace, and coastal watersheds is about 8,550 km2 . Waters of Matlacha Pass and Pine Island Sound occupy 312 km2 compared to their small coastal basin of 660 km2 . Pine Island Sound receives negligible drainage directly, whereas the indefinite area of "San Carlos Bay" is supplied by a 3,310 km2 watershed (excluding Lake Okeechobee and its tributaries) (McNulty and others, 1972).

Regions drained by the three rivers into the study area are shown in figure 2. Most of the Charlotte Harbor area is within the Coastal Lowlands (Cooke, 1945) although the Myakka River heads in the Central Highlands region (Joyner and Sutcliffe, 1976), corresponding to the upper De Soto Plain of White (1970). The Peace River flows from the Polk Uplands and crosses the De Soto Plain before reaching Charlotte Harbor. The Caloosahatchee River origi­ nates on the western shore of Lake Okeechobee and is controlled by locks. Coastal areas lie entirely within the Pamlico Terrace (8 meters above sea level). Surface geology of the terrace is a coquinoid limestone with sand and clays although shell hash with limestone, silty sands, and clays are common on higher terraces (Puri and Vernon, 1964).

Land Use

Mean altitudes of Sarasota County (5.5 m), De Soto County (17.1 m), Charlotte County (0.9 m), and Lee County (2.1 m) illustrate the low, flat character of land around the harbor. Native upland vegetation is mostly pine flatwood, with interspersed pine-oak assemblages and grasslands and swamp forests in wet areas. In 1973 most land was used for grazing and farming. Total county area given to these uses in 1973 were: Sarasota, 62 percent; De Soto, 84 percent; Charlotte, 53 percent; and Lee, 36 percent (Barnett and others, 1980; French and Parsons, 1983).

The areas of urban lands in the region increased 2,490 percent between 1945 and 1982 (Harris and others, 1983). Punta Gorda and Fort Myers accounted for 61 percent of total urban lands whereas platted and cleared but: unbuilt subdivisions accounted for the balance of urban land. Total population rose by nearly 600 percent in 26 years since 1950. With hundreds of thousands of undeveloped lots surrounding the harbor, another 0.5 to 1.5 million new residents are projected by 2020.

Climate

The study area has a humid, subtropical climate with long, warm, and moist summers and relatively dry winters. Winds are northerly in late fall and winter and southerly at other times. Windiest months are March and April. 82° 20' 82° 10 81° 50'

LOCATION OF STUDY AREA Port Charlotte 27° Barren Collier

Little CasparH! Island Pjacida Causeway

Bpca Crande e

CapBva Island

26° 30'

Cartos Bay 0 6 10 KILOMETERS Point II 1 I '1 L ill 1 I Sanrbel Ybel Estero Island Island

Figure 1. Charlotte Harbor estuarine system, southwest Florida, 83° 82° 81 c

28°

27° GULF OF MEXICO

EXPLANATION A: Myakka Subbasin B: Peace Subbasin C: Caloosahatchee Subbasin

Basin divide Subbasin divide

Figure 2. Drainage basins of the Myakka, Peace, and Caloosahatchee Rivers in Florida

Mean monthly low temperature at Punta Gorda ranges from -1.1°C (January) to 16.9°C (August) and averages 7.6°C. Extreme low temperatures are infre­ quent; only six major freezes occurred from 1930 through 1979 (South Florida Water Management District, 1980). Temperature changes are most rapid in March through May and September through November. Maximum temperatures range from 30.5°C (January) to 38.0°C (July-August) at Punta Gorda and average 34.4°C. Relative to inland stations, coastal areas are warmer in winter and cooler in summer, by about 3°C.

Coastal sites also receive less rain than inland areas. Estevez (1981) described a 120 to 240 millimeter difference in mean annual rainfall across the long (northeast-southwest) axis of Charlotte Harbor. Between 130 and 155 mm of rain falls in the region per year (South Florida Water Management District, 1980), half during June through September. About 100 thunderstorms occur in the area each year; three-fourths occur from June through September (Jordan, 1973). Rainfall during a typical water year in southwest Florida declines from October through January; a minor wet period may occur during February through April but May is frequently dry and rainfall increases from June through September. Five direct and 24 indirect hurricane strikes have occurred in or near the study area since 1900.

Hydrology

Discharges of the Kyakka, Peace, and Caloosahatchee Rivers correlate closely to rainfall in their respective watersheds although timing of discharge in the Caloosahatchee River is affected by lock operations between Fort Myers and Lake Okeechobee.

Average discharge of the Myakka River is 7.2 m3 /s which reflects no-flow conditions for many days in some years; maximum recorded discharge is 246 m3 /s. Discharges from the Peace and Caloosahatchee Rivers into Charlotte Harbor and San Carlos Bay are much greater by comparison. Average discharge of the Peace River is 32.7 m3 /s with recorded extremes of 1.1 to 1,030 m3 /s. Discharge of the Caloosahatchee River near Olga averages 40.8 m3 /s (range 0.04-606 m3 /s). Figure 3 summarizes the average duration of flows for each river and illustrates (a) lockage effects on Caloosahatchee River discharges compared to Peace River dis­ charge, (b) magnitude of differences between Peace and Myakka Rivers, and (c) frequency of very low discharges in Myakka River (Foose, 1983).

During the 1980 water year spring was relatively wet and summer relatively dry insofar as Myakka and Peace River flows were concerned. Flow data for water year 1980 are given by month for each river in table 1. Overall, the Myakka River contributed an average of about 5 percent of all three rivers' discharge to estuarine waters; the Peace River, 25 percent; and the Caloosahatchee (to San Carlos Bay), 70 percent. The Peace River contributed 80 to 85 percent of gaged discharges to Charlotte Harbor proper.

The relation of Peace River flows in water year 1980 to the previous 5 years is shown in figure 4, adapted from Environmental Quality Laboratory (1981). Peace Pviver data reflect tributary flows to the estuarine study area in general and illustrate the amount of annual and seasonal variation that occurs in river discharge. Annual mean flow ranked 48th of 49 years of record and the 1980 wet season was driest since 1961, being less than half the mean flows of preceding wet seasons (Environmental Quality Laboratory, 1981).

Tides in Charlotte Harbor and adjacent waters are mixed diurnally and semi- diurnally and under ordinary conditions they do not exceed 90 centimeters. Lowest low and highest high tides occur in December through February and June through August, respectively. Fastest tidal currents occur at Boca Grande where maximum flood and ebb speeds are about 1.13 and 0.46 m3 /s, respectively. Currents in Gasparilla Sound and lower Charlotte Harbor are dominated by tidal movements through Boca Grande. The tidal influence of Redfish Pass is limited to central Pine Island Sound. A tidal division in Matlacha Pass occurs in the narrows near State Road 78 bridge (Estevez, 1981).

Tidal effects occur inland to Snook Haven (Myakka River), several kilometers upstream of State Road 771 (Peace River), and the locks at S-79 (Caloosahatchee Pviver). Tidal waters of the study area extend from barrier bars between Gaspa­ rilla and Estero Islands inland to U.S. Highway 41 (Myakka River), Interstate 75 (Peace River), and Punta Rassa (Caloosahatchee River). DISCHARGE CUBIC FEET PER SECOND

n H- 00c

/^x cn O pt 05 hj rt H- fjj a* C it* pf

VO oo

00 a> cn

CO 8

DISCHARGE CUBIC METERS PER SECOND Table 1. Discharge of the Myakka, Peace, and Caloosahatchee Rivers for water year 1980

[Data from U.S. Geological Survey, 1981]

Combined Mean monthly discharge, monthly Contributions to Charlotte Date cubic meters per second totals, Harbor, percent of total Myakka Peace Caloosahatchee cubic Myakka Peace Caloosahatchee River River River meters River River River

1979

October 21.6 84.7 168.1 8,481 31 61 November 2.4 1.2 34.5 1,387 20 75 December 1.2 10.7 33.2 1,398 24 74

1980

January .9 11.6 71.0 2,590 1 14 85 February 5.0 19.5 127.6 4,311 <1 13 87 March 5.4 16.2 88.0 3,230 <1 16 84

April 4.8 32.5 93.4 3,918 4 25 71 May 2.6 14.3 48.2 2,018 4 22 74 June 2.8 15.2 17.4 1,060 8 43 49

July 1.8 14.7 15.0 976 6 47 48 August 3.0 14.4 33.4 1,573 6 28 66 September 12.3 16.2 51.6 2,403 15 20 64

Shoreline and Subtidal Environment

Most tidal waters in the region are unstratified, however, upper and middle Charlotte Harbor are vertically stratified during most wet seasons and depending on discharge of the Peace River can have surface salinities near zero as far seaward as Boca Grande (Alberts and others, 1970; Environmental Quality Labora­ tory, 1981). Salinity in central harbor areas ranges from 0 to 36 parts per thousand (°/oo) and can reach 40 °/oo in tidal creeks and ponds. Taylor (1974) gave summary data for three estuarine areas of the region:

Charlotte Harbor Pine Island Sound San Carlos Bay Parameter Mean Range Mean Range Mean Range

Salinity, °/oo 28.6 20.0-34.2 34.3 28.5-36.2 32.6 25.5-36.2 Temperature, °C 24.7 16.5-30.9 25.5 19.7-31.2 25.4 19.7-31.6 pH, standard units 7.8 7.3- 8.1 8.0 7.6- 8.3 8.1 7.8- 8.3 Dissolved oxygen, rog/L 4.3 3.4-5.2 4.1 2.8- 4.9 4.4 3.7- 5.3 180 -

150 -

120 -

90-

60 -

30 _

i I i i i i Jan Apr Jul Oct Jan Apr Jul Oct Jan Apr Jul Oct Jan Apr Jul Oct Jan Apr Jul Oct Jan 1976 1977 1978 1979 1980 1981

MONTH AND YEAR Figure 4. Seven-day average discharge of the Peace River at Arcadia, January through March 1981, and the 1980 water year (shaded).

Four shoreline types occur in the area: (1) riverine shores are low, narrow to broad, and vegetated by black needlerush (Juncus roemerianus) marshes inter­ spersed with mangroves or leather fern (Acrostiehum danaeifoliwri) ; (2) estuarine shores are either beaches or wetlands, primarily forests of black mangrove (Avioenn-La germinans) or red mangrove (Khizophora mangle); (3) forests are separated from open water by low berms, and are narrow to broad; and (4) barrier beaches are narrow unvegetated shores of moderate slope exposed to the Gulf of Mexico, or on inlets between islands.

Much of the shoreline and bathymetry of Charlotte Harbor and surrounding waters is structurally intact. Alterations have been made in some areas, however, where shorelines were filled for development of causeways or where canals were dredged. The Intracoastal Waterway traverses Gasparilla and Pine Island Sounds and enters the Caloosahatchee River. Emergent and submerged spoil border the Intracoastal Waterway (Harris and others, 1983; National Oceanic and Atmospheric Administration, 1981). Also, dredging of oyster shell near Bokeelia and Punta Rassa has altered bathymetry (Whitfield, 1975). Most of the subtidal parts of Charlotte Harbor are shallow and level (fig. 5). Depths to about 4 meters occur in the upper and middle harbor. A maximum depth of 15.5 meters occurs at one location in Boca Grande. Anoxic or near anoxic conditions occur near the bottom in deep (>3 m) areas of the upper and middle harbor but not near the coast (Eraser, 1981).

Unvegetated sandy bottoms are the most common benthic environment of the Charlotte Harbor estuarine system and adjacent inshore waters. Sediments of the area are structurally intact and relatively free of contaminants, except near residential canals and marinas (Van Vleet and others, 1984).

Mud flats, oyster reefs, and seagrass beds are the dominant intertidal and subtidal bottom types within the study area. Oyster reefs are most abundant in upper Charlotte Harbor, Gasparilla Sound, and the lower Caloosa- hatchee River-San Carlos Bay areas. Although not studied in Charlotte Harbor or adjacent inland waters, the fauna of oyster reefs typically are diverse and abundant (Wells, 1961). Seagrasses include widgeongrass (Puppia mavitimci) , manatee grass (Syringodi-um f-iliforme) , shoalgrass (Halodule wrightii) and turtle grass (Thalassia testudinwn). The diversity and abundance of seagrass fauna depend on grass species and luxuriance of bed growth, among other factors (Stoner, 1980). Most grassbeds and live oyster reefs occur in shallow water (less than 2 m) although relict reefs occur in deep water near Punta Gorda.

The Florida Department of Natural Resources (Harris and others, 1983) estimated the area of bottom types for the study area in 1945 and 1982:

Area, in hectares Percent Type 1945 1982 change

Salt marsh 2,934 1,435 -51 Mangrove 20,851 22,918 + 10 Unvegetated tide flat 4,535 1,102 -76 Oyster reef 326 197 -39 Seagrass beds 33,572 23,672 -29 Open water 116,873 126,548 + 8

Salt marsh losses were attributed to development. Declines in nonvege- tated tidal flats were ascribed to replacement by mangroves; reasons for oyster decline were unclear but estimates may be understated. Seagrass loss was greatest in the Captiva area (40 percent total study area decline) and was attributed to channelization (Harris and others, 1983). Overall, about 80 to 85 percent of the total study area in 1982 can be presumed to be a soft-bottom benthic environment.

10 82° 20' 82° 10' 82° 81° 50'

< 27° : Barren ®i Collier Causeway

30 INTERTIDAL STATION- location and number. SUBTIDAL STATION- location and number. 26° 50' Placida S4

Vi^'vjife'- i 26° 40' /Pine <^i^y

26° 30'

Figure 5. Bathymetry and location of sampling stations.

11 Sediments

Sediment origins, transport, and character in tidal waters of the area were described by Huang and Goodell (1967). Soils of the region are better termed surficial sediments owing to their recency and lack of structure. Most are sandy or organic, acidic and marine, and occur in subtidal areas as a mantle 3 meters thick. Marine sediments are quartz sand and carbonate shell mixtures. Sediments are dominated by quartz (greater than 50 percent) except in Boca Grande Pass and areas south of Sanibel Island. Quartz sands originated from Quaternary terraces around the estuaries. Because the rivers run at low grade, they transport more fine than sand-sized sediments downstream, although sediments in tidal areas are predominantly sand-sized. Detrital carbonate shell consti­ tutes the gravel-sized deposits. Huang and Goodell (1967) stated of the area sediments that:

Mean grain sizes range from 4.68 to -0.84 phi with an overall average of 2.01 phi. However, 90 percent of the means fall between 1.5 to 3.5 phi units***In Charlotte Harbor proper grain size decreases headward; while in the San Carlos Bay area, size decreases south to Sanibel Island***much coarser sediments are present in the deeper channels. Although the percentage of sand decreases on the west or seaward side of the harbor, the mean grain size increases because of the addition of shell gravel.

They also observed that sorting improved regionally from the northwest of the harbor mouth, and decreased from the head to the mouth of the San Carlos Bay. Sediments in channels and the harbor head near Punta Gorda were poorly sorted.

Huang and Goodell (1967) identified montmorillonite, kaolinite, illite, attapulgite, and zeolite among the clay minerals. Montmoril­ lonite is most abundant in the harbor head, the central harbor, and offshore San Carlos Bay, particularly in channels. Among carbonate minerals, magnesium calcite, aragonite, and dolomite are present in sediments of the study area. Aragonite is lowest concentration at the harbor mouth whereas dolomite, which increases with the silt content of sediments, is more common in Charlotte Harbor proper than in San Carlos Bay. Overall carbonates vary from 0.64 percent in the Peace River to 93.87 percent in tidal channels; a general decrease of carbonates was seen with increasing depth. Minerals comprised of phosphates appear on shores and in channels as coarse sand to dark granular sediments, or in shallows, as dark medium sand or silt. Highest concentrations of sedimentary phosphate occur in the central part of the harbor proper. Values for organic carbon range from 0.08 to 3.06 percent but 90 percent of samples are in the range of 0.1 to 1.0 percent. In general, organic carbon (as weight percent) decreases as depth or sorting increases. Organic nitrogen ranges from 0.01 percent to 0.25 percent and is distri­ buted as is organic carbon, but the ratio of organic carbon to nitrogen appears to increase with depth. Total organic matter is about 1.0 percent in surface sediments and 0.7 percent at depths of about 30 cm (Huang and Goodell, 1967).

12 Previous Studies of Benthic Fauna

Taylor (1974) stated accurately, "To date, there has been no systematic study of invertebrates throughout the Charlotte Harbor region." This observa­ tion applies not only to invertebrates generally but to the most commonly studied ecological group of invertebrates, benthic forms. Godcharles and Jaap (1973) reported on molluscs and crustaceans larger than 1 cm, caught with dredges in Charlotte Harbor but not in lower Pine Island Sound, Matlacha Pass, or San Carlos Bay. All samples were taken in at least 3 meters of water. Texas Instruments (1978) used trawls and 5 Ponar grabs (0.52 m2 each) at stations in upper Charlotte Harbor and the Peace River. Grabs were washed on 0.59 mm screens. Fauna were subsampled where taxonomic groups exceeded 200 individuals and identified to lowest practical levels, "usually genus." All samples were taken in 1976.

Environmental Quality Laboratory (1981) summarized results of quarterly samples at one station near station S-3 in Charlotte Harbor near Punta Gorda. Sampling began March 1976, using 5 Ponar grabs. Samples were washed on 0.59 mm screens. Over 20 consecutive quarters (to December 1980) number of taxa ranged from 3 to 33; density ranged from 14 to 299 individuals per 0.1 m2 ; diversity (H f ) ranged from 0.51 to 2.77; and evenness (J') ranged from 0.43 to 0.99. No correlation of these or other indices was found with flow, temperature, salinity, or dissolved oxygen. The Environmental Quality Laboratory and the Florida Department of Environmental Regulation are also conducting invertebrate studies in the Peace and Hyakka Rivers, and Chailotte Harbor, on selected taxa or with different gear and techniques.

In the southern part of the study area, Gunter and Hall (1965) collected large, epibenthic invertebrates by seine and trawl and found more species in Pine Island Sound and San Carlos Bay than the lower Caloosahatchee River. Applied Biology, Inc. (1976), collected benthic sampler near an electric power station farther up the Calcosahatchee River. Specimens were identified to genera. The number of taxa per station ranged from 11 to 23; most stations had between 15 and 19 taxa. Densities were highest in April (1975) ard lowest in July due to hydrographic conditions. Estevez (1981) summarized numerous other site- or taxon-specific studies in the area.

METHODS OF INVESTIGATION

Station Locations

Approximate station locations were established after a literature search and discussion with scientists familiar with the study area in order to cover a representative range of conditions. In the field, stations were situated on uniform, level bottom where possible. Seagrass beds, oyster reefs, and mamnade channels were avoided. Subtidal stations were located in at least 2 meters of water if local conditions allowed. In most cases, a diver inspected the sub­ stratum of subtidal sites if the bottom was not visible from the surface. Final stations (11 intertidal, 14 subtidal) were located by adjusting their position for bearings of convenience to prominent landmarks. Positions were mapped in the field and final positions were determined by the U.S. Geological Survey. Station locations are shown in figure 5 and site data are given in table 2. Detailed site locations are available from the Mote Marine Laboratory. Table 2. Location and description of sampling stations

Station Latitude Longitude Site description

27°02 f 39" 82°17'32 Intertidal, 0.8 m; north bank Myakka River south of U.S. 41, behind trailer park near bridge.

26°57 f 17" 82°12'43 Intertidal, 0.6 m; south bank Myakka River east of SR 771 bridge downstream of creek mouth. 26 057'02" 82°03'34 Intertidal, 0.6 m; east bank of Barren Collier Causeway, north side of Peace River, 50 m from shore.

26°49 f 43" 82°16 f 15 Intertidal, 0.6 m; west bank of Placida Causeway, east side of Gasparilla Sound. 26°43 I 07" 82°15'32 Intertidal, 0.5 m; south end of Gasparilla Island between phosphate dock and pier. 26°42 f 23" 82°09'43 Intertidal, 0.5 m; north end of Pine Island, 100 m offshore, across from post office. 26°39 f 38" 82°09 f 19 Intertidal, 0.6 m; west side of Pine Island, 50 m west of historical marker at indian mound. 26°29 f 08" 82°10'52 Intertidal, 0.5 m; sand bar east of bridge to Captiva Island. Pass fully closed on sampling dates. 26°28 f 27" 82°08 f 35" Intertidal, 0.3 m; 50 m ENE of observation boardwalk, Stop 4.

10 26°29 f 03" 81°59 f 53" Intertidal, 0.7 m; south shore, 180 m from easternmost bridge.

11 26 0 26 f 51" 81°56 f 47" Intertidal, 0.7 m; 50 m below MHW mark.

S-l 26°57 f 39" 82 001 f 05" Subtidal, 1.7 m; Green "15" in Peace River above Punta Gorda. S-2 26°55 f 51" 82°ll f 06 Subtidal, 2.6 m; Green "9" lower Myakka River. S-3 26°55 f 51" 82°06 f 20 Subtidal, 3.5 m; Red "2" between Punta Gorda and Hog Island.

14 Table 2. Location and description of sampling stations Cont inued

Station Latitude Longitude Site description

S-4 26°51 t 26" 82°09 f OO" Subtidal, 1.9 m; halfway between Green "5" and "7" central Charlotte Harbor, 175 m east of shore.

S-5 26°48 f 05" 82°03'47" Subtidal, 2.0 m; NNE entrance to marina.

S-6 26°46 f 30" 82 0 14'30" Subtidal, 2.2 m; near Green "7" (ICW) and Gasparilla Sound. S-7 26°44 f 19" 82 0 10 f 04" Subtidal, 3.2 m; red "4" between Pine Island and mainland, lower Charlotte Harbor. S-8 26°42 f 30" 82°15 f 26" Subtidal, 3.7 m; west of north end of Cayo Costa, south of lighthouse at Boca Grande. S-9 26°39 f 43" 82°12 f 15" Subtidal, 2.0 m; 200 m east of Useppa Island, upper Pine Island Sound.

S-10 26°39 f 16" 82°05 f ll" Subtidal, 2.5 m; upper Matlacha Pass east of channel. S-ll 26°33 f 49" 82°ll f 25" Subtidal, 1.7 m; between Red "42" and North Captiva Island. S-12 26°3r50" 82 007 f 38" Subtidal, 2.5 m; lower Pine Island Sound. S-13 26°32 f 02M 82°03 f 57" Subtidal, 3.0 m; lower Matlacha Pass.

S-14 26°27 f 53" 82°00 f 22" Subtidal, 4.0 m; halfway between mainland and Sanibel Island, San Carlos Bay.

Sediments Two cores were taken from undisturbed sediments at each station on each visit. Each 5-cm-diameter plug penetrated at least 10 cm and retrieved approximately 200 cm3 of sample, which was transferred to a labeled container and stored on ice. At the laboratory, each plug was rinsed over a 0.063 mm sieve, dried at 100°C for 24 hours, shaken for 30 minutes in a 6-element nest of sieves (1 phi intervals), and weighed by fraction. Formulae and statistics for sediment characteristics at each station are provided in Supplementary Data I. The silt relay fraction ( 0.063 mm) was centrifuged at 3,500 revolu­ tions per minute (rpm) for 30 minutes, dried at 100°C for 72 hours, and

15 weighed. All weights were entered into SEDSTAT software for standard granulometry analysis. Organic content was computed from at least 2 subsam- ples taken from each well mixed core before wet sieving. The subsamples were dried at 100°C to constant weight and weighed, ashed at 550°C for 60 minutes, and reweighed. Organic content was computed as percent loss in original weight for each subsample. A mean of subsamples values was recorded as the station value for organic content.

Hydrography

Depth was measured with a leadline. Temperature, conductivity, and dissolved oxygen were measured at the surface and bottom at subtidal stations and at middepth at intertidal stations. A YSI Model 57 SCT meter was used to measure temperature, conductivity, and salinity; a YSI Model 33 meter was used for dissolved oxygen.

Fauna

Intertidal samples of sediments were taken with 7.62 cm diameter cores to a depth of 15 cm. Cores were closed at the top with 0.5-mm-mesh screening. Five samples were taken (total sample area=0.114 m2 ). Contents of the five cores were pooled and washed as one sample on a 0.5-mm-mesh sieve. Subtidal samples were taken with a petite Ponar grab sampler (0.022-m2 area). Contents of five grabs were emptied into different buckets and washed as separate samples on a 0.5-mm-mesh sieve (total sample area=0.112 m2 ).

Material left on the sieve was rinsed into a prelabeled jar. A 15 percent magnesium chloride (MgCl2 ) solution (relaxant) was added to each jar, which was shaken and allowed to stand for 30 minutes. After decanting the relaxant, fixative (10 percent formalin in seawater) and stain (rose bengal) were added and the jar was reshaken.

At the laboratory, fixative was replaced with 70 percent isopropyl alcohol. Each sample was separated by agitation over a 0.5-mm sieve into light and heavy fractions for sorting. Heavy fractions were pan sorted and light fractions were sorted under a stereozoom dissection microscope. Sorted fauna from both fractions were combined in labeled vials containing 70 percent isopropyl alcohol and later identified and enumerated to the lowest practical identification level, usually species.

Sampling Dates

Subtidal stations were sampled on May 15, 1980. Intertidal samples were collected on June 16, 1980, and both environments were resampled on September 16, 1980. May and June samples were made 1 to 4 days after a new moon. In September the moon was entering its first quarter. On May and September tocuupling dates, tides were semidiurnal with high tides occurring around dawn and in the early to late afternoon. On the June date, tides were diurnal; a high tide in mid to late afternoon was followed by a low tide at about midnight. The use of brand names in tin-is report is for identification only and does not constitute endorsement by the U.S. Geological Survey.

16 RESULTS

Sediments

For all samples combined (N=50) most (72 percent) had fine sands (<3 phi) and only 6 percent had very fine sands (<4 phi). Another 10 percent had coarse sand to gravel. Half of all stations had poorly sorted to moderately sorted sediment (sigma phi, 0.71-2.00) and the remaining stations were modera­ tely well sorted (0.50-0.71). Moreover, 44 percent of all samples were nearly symmetrical relative to skewness (S =-0.1-0.1) and most of the remainder (32 percent) were skewed toward coarser particles. The majority of all samples had less than 1 percent silt-clay and combustible organics. Of all samples, 77 percent had less than 2 percent silt-clay and 88 percent had less than 2 percent organic carbon.

In September, subtidal sediments were coarsest near Boca Grande and finest in lower Pine Island Sound. Intertidal sediments were finest in upper Charlotte Harbor and along the western shore of Pine Island Sound. Intertidal organic content was low (1.0 percent) throughout the study area except for upper Gasparilla Sound. Subtidal organic content in September was highest off Punta Gorda, followed by sites near Boca Grande. Lower river areas and lower Pine Island Sound had moderate amounts (0.5-1.0 percent) of organic matter.

Subtidal stations 7 and 12 had highest and lowest mean grain sizes, respectively, of all stations sampled in September. Station S-7 sediments were also strongly skewed toward finer particles. Sediments skewed toward coarse particles included Blind Pass (station 8) and San Carlos Bay (station S-14), which were also more poorly sorted than sediments elsewhere. Best sorted sediments were at stations 2 and S-4 along the western shore of Charlotte Harbor. Station S-4 sediments had lowest organic contents and S-8 (Boca Grande) had fewest silt-clay particles.

Hydrography

Transformations and corrected data for on site observations at each station are provided in Supplementary Data II. Water temperature ranged from 25.5 to 29.0°C overall; salinity, 4.1 to 34.0 °/oo; and dissolved oxygen, 2.6 to 7.4 mg/L. Table 3 summarizes hydrologic data.

Mean salinity in open surface waters fell from 27.6 /oo to 21.3 /oo during May through September despite the relatively wet spring and dry summer. Mean bottom salinity was slightly greater than mean surface salinity (23.8 °/oo versus 21.3 °/oo, respectively) in September when intertidal and subtidal sampling coincided. Dispersion about salinity means was greater than for other parameters (standard deviation to 40 percent).

Intertidal dissolved oxygen fell significantly (student t test; p <0.05) from June through September. Open surface waters contained more dissolved oxygen than deeper water by about 0.5 mg/L in May-June and 1.0 mg/L in September. Intertidal and bottom means were similar. Mean temperatures and salinities of intertidal and bottom waters also were very similar in September.

17 Table 3. Summary of water-quality data

Intertidal Subtidal . Subtidal (mid-depth) ___(surface) (bottom) Parameter June September May September May September 1980 1980 1980 1980 1980 1980

Temperature

Mean, degrees Celsius 26.0 28.4 27.5 29.1 27.2 28.6 Standard deviation Degrees Celsius .3 .3 .7 .5 .7 .3 Percent of mean 1.1 1.0 2.5 1.7 2.5 1.0

Salinity

Mean, parts per thousand 23.3 21.3 27.6 21.3 27.9 23.8 Standard deviation Parts per thousand 6.5 8.6 5.7 7.7 5.4 5.7 Percent of mean 27.9 40.3 20.6 36.1 19.3 23.9

Dissolved oxygen

Mean, milligram per liter 6.0 4.6 6.3 5.6 5.8 4.6 Standard deviation Milligram per liter 1.4 .4 .4 1.0 .6 1.0 Percent of mean 23.3 17.3 6.3 17.8 10.3 21.7

Since intertidal salinity and dissolved oxygen data had comparable variability they were combined with bottom values to produce a composite description of hydrographic conditions (fig. 6). Bottom salinity was highest in Boca Grande Pass and San Carlos Bay. Gasparilla Sound and most of Pine Island Sound had 25 to 30 °/oo at bottom; Matlacha Pass had lower salinities. Bottom salinity fell to 5 °/oo in the Myakka and Peace Rivers, at or before stations 1 and S-l, respectively. Means of dissolved oxygen at bottom were low (<3.5 mg/L) in the Myakka River and between 3.5 and 4.0 mg/L for lower Peace River, upper Charlotte Harbor, and Gasparilla Sound. Highest mean values (>5.5 mg/L) were in San Carlos Bay and lower Pine Island Sound.

Fauna t A total of 546 species representing 15 phyla were collected during the study period (table 4). Annelida (polychaete worms) were most common (197 species), followed by Mollusca (gastropods, bivalves, and related forms; 156 species) and Arthropoda (crustaceans, 133 species; insects, 5 species). Ninety percent of all species were from these three phyla.

18 82° 20' 82° 10' 81° 50'

EXPLANATION DISSOLVED OXYGEN (In milligrams per liter)

27' 3.5-4.0 __

20 LINE OF EQUAL SALINITY Interval Little is 5 parts per Caspari lla thousand. 26° 50' Island Placida Causeway

Boca Crande 0 26° 40'

26° 30'

Bay 10 KILOMETERS Point Sanibel Ybel Island

Figure 6. Bottom salinity and dissolved oxygen, September 1980.

19 Table 4. Master list of species

PHYLUM PORIFERA Hesionidae sp. Porifera spp. Gyptis brevipalpa Micropthalmus sczelkowii PHYLUM CNIDARIA Parahesione luteola Hydrozoa sp. Podarke obscura Hydroidea sp. Ancistrosyllis hamata Anthozoa sp. Ancistrosyllis cf hamata Actinaria sp. Ancistrosyllis hartmanae Athenaria spp. Ancistrosyllis jonesi Thenaria spp. Sigambra tentaculata Sigambra bassi PHYLUM PLATYHELMINTHES Pilargidae sp. Platyhelminthes spp. Synelmis albini Polycladida sp. Syllidae sp.D Stylochus sp. Autolytus dentalius Euplana gracilis Autolytus sp.A Gnesioceros sp. Trypanosyllis sp. Prosthiostomum sp. Typosyllis sp. Typosyllis cf lutea PHYLUM RYNCHOCOELA Typosyllis sp.B Nemertina spp. Exogone dispar Exogone lourei PHYLUM NEMATODA Exogone atlantica Nematoda spp. Sphaerosyllis sp. Sphaerosyllis glandulata PHYLUM ANNELIDA Sphaerosyllis taylori CLASS POLYCHAETA Sphaerosyllis longicauda Pseudohalosydna sp. Sphaerosyllis piriferopsis Pseudohalosydna sp.A Brania clavata Polynoidae sp. Ehlersia cornuta Polynoidae sp.B Odontosyllis sp. Polynoidae sp.A Odontosyllis enopla Malmagreniella sp.B Syllides sp. Grubeulepis augeneri Syllides floridana Pholoe sp. Streptosyllis pettiboneae Sthenelais boa Parapionosyllis sp. Sthenelais sp.A Parapionosyllis longicirrata Paleanotus heteroseta Dentatisyllis carolinae Paramphinome sp.B Plakosyllis quadrioculata Phyllodoce arenae Nereidae sp. Phyllodoce castanea Neanthes acuminata Phyllodocidae sp.A Neanthes micromma Eteone heteropoda Neanthes succinea Eteone laceta Nereis falsa Eulalia sanguinea Platynereis dumerilii Paranaitis polynoides Laeonereis culveri Protomystides bidentata Nephtys simoni

20 Table 4. Master list of species Continued

Aglaophamus verrilli Polydora sp. Glycera sp. Polydora social is Glycera americana Polydora ligni Hemipodus roseus Polydora websteri Glycinde solitaria Prionospio sp. Goniadides carolinae Prionospio heterobranchia Onuphidae sp. Prionospio pinnata Onuphis sp. Prionospio cristata Onuphidae sp.A Spio pettiboneae Diopatra sp. Spiophanes bombyx Diopatra cuprea Pseudopolydora sp. Kinberyonuphis simoni Paraprionospio pinnata Mooreonuphis nebulosa Streblospio benedicti Mooreonuphis simoni Dispio uncinata Mooreonuphis sp.A Scololepis squamata Eunice vittata Scololepis texana Eunice websteri Aonides mayaguezensis Lumbrineris latreilli Minuspio sp.B Lumbrineris verrilli Minuspio cirrobranchiata Lumbrineris ernesti Carazziella hobsonae Lumbrineris cf Candida Magelona pettiboneae Lumbrineris sp.D Poecilochaetus johnsoni Arabellidae sp. Spiochaetopterus costarum oculatus Drilonereis longa Caulleriella sp. Arabella iricolor Caulleriella sp.A Arabella mutans Tharyx sp. Dorvilleidae sp. Tharyx cf dorsobranchialis Ophryotrocha sp.A Tharyx sp.A Schistomeringos rudolphi Chaetozone sp. Pettiboneia sp.A Chaetozone setosa Orbiniidae sp. Chaetozone sp.A Leitoscoloplos sp. Cirriformia sp. Leitoscoloplos foliosus Cirriformia sp.A Leitoscoloplos fragilis Acrocirrus frontifilis Naineris sp. Ctenodrilus cirrata Scoloplos sp. Piromis roberti Scoloplos rubra Armandia maculata Orbinia riseri Travisia hobsonae Aricidea sp. Capitellidae sp. Aricidea philbinae Capitellidae sp.A Aricidea cf catherinae Capitella capitata Aricidea fragilis Capitella jonesi Aricidea taylori Heteromastus filiformis Aricidea sp.C Notomastus latericeus Cirrophorus lyra Mediomastus sp. Cirrophorus furcatus Mediomastus ambiseta Polydorid Mediomastus californiensis Spionidae sp. Decamastus sp.A Apoprionospio pygmaea Capitellidae Genus A

21 Table 4. Master list of species Continued

Arenicola cristata Caecum pulchellum Asychis elongata Caecum imbricatum Clymenella mucosa Caecum strigosum Maldane cf sarsi Caecum insularum Axiothella mucosa Batillaria minima Owenia fusiformis Diastoma varium Myriochele oculata Cerithiidae sp. Sabellaria vulgaris Cerithium sp. Pectinaria gouldii Cerithium muscarum Ampharetidae spp. Epitonium sp. Amphicteis gunneri Epitonium nautlae Melinna maculata Melanella sp. Isolda pulchella Calyptraea central is Terebellidae sp. Crepidula sp. Pista cristata Crepidula plana Pista cf quadrilobata Crepidula maculosa Polycirrus sp. Naticidae sp. Loimia medusa Natica pusilla Amaeana trilobata Polinices duplicatus Streblosoma hartmanae Murex sp. Sabellidae sp. Mitrella sp. Chone sp. Mitrella lunata Chone americana Anachis obesa Megalomma bioculata Anachis floridana Potamilla sp.A Nassarina manilifera Sabella melanostigmae Cantharus cancellarius Fabricia sabella Busycon contrarium Fabricia sp.A Melongena corona Spirorbis corrugatus Nassarius vibex Spirorbis spirillum Nassarius albus Hydroides dianthus Olivella sp. Hydroides protulicola 01iveil a dealbata Questa caudicirra Olivella minuta Boguea enigmatica Olivella pusilla Archiannelida sp. Olivella floralia Polygordius sp. Oliva sp. Oligochaeta spp. Granulina ovuliformis Marginella apicina PHYLUM MOLLUSCA Marginella aureocincta CLASS GASTROPODA Marginella hartleyanum Gastropoda sp. Marginella lavalleeana Neritina reclivata Col umbellidae sp. Sayella fusca Col umbel la rusticoides Sayella hemphilli Turridae sp. Sayella crosseana Kurtziella sp. Vitrinellidae sp. Cryoturris cerinella Cyclostremiscus pentagonus Conus jaspideus stearnsi Teinastoma sp. Odostomia sp. Caecum sp. Odostomia bisuturalis

22 Table 4. Master list of species Continued

Odostomia impressa Neaeromya floridana Odostomia seminuda Carditamera floridana Odostomia producta Pteromeris perplana Odostomia laevigata Astarte sp. Turbonilla sp. Crassinella lunulata Turbonilla interrupta Cardiidae sp. Turbonilla conradi Laevicardiurn sp. Turbonilla dalli Laevicardium mortoni Turbonilla sp.F Spisula solidissima Acteon punctostriatus Mulina lateralis Acteocina canaliculata Rangia cuneata Bulla striata Mactra fragilis Haminoea succinea Raeta plicatella Haminoea elegans Ensis minor Unela remanei Macomidae sp. Nudibranchia spp. Macoma sp. Polycera sp. Macoma tenta Dosinia discus Macoma constricta Tellina spp. PHYLUM MOLLUSCA Tellina lineata CLASS POLYPLACOPHORA Tellina versicolor Polypiacophora spp. Tellina alternata Tellina squamifera PHYLUM MOLLUSCA Tellina tampaensis CLASS BIVALVIA Tellidora cristata Bivalvia spp. Donax variabilis Nucula proxima Tagelus sp. Nuculana acuta Tagelus plebius Solemya occidental is Tagelus divisus Anadara transversa Semelidae sp. Glycemeris pectinata Semele sp. Musculus lateralis Semele bellastriata Modiolus modiolus squamosus Semele purpurascens Brachidontes exustus Semele nuculoides Amygdalum papyri urn Abra aequalis Lioberus castaneus Cumingia tellinoides Geukensia demissa granosissima Mytilopsis leucophaeta Cyclopecten sp. Polymesoda caroliniana Anomia simplex Transennella conradina Crassostrea virginica Mercenaria campechiensis Lucinidae sp. Chione cancellata Lucina sp. Gouldia cerina Lucina nassula Parastarte triquerta Lucina radians Anomalocardia auberiana Anodontia alba Cooperella atlantica Diplodonta punctata Chama sp. Erycina sp. Sphenia antillensis Erycina emmonsi Corbula contracta My sell a planulata Pandora sp.

23 Table 4. Master list of species Continued

Lyonsia hyalina floridana Cumella sp.A Asthenothaerus hemiphilli Cyclaspis sp.D Bushla elegans Cyclaspis sp.B Bivalvia sp.A Cyclaspis sp.A Vaunthomsonia sp. PHYLUM MOLLUSCA Tanaidacea spp. CLASS SCAPHOPODA Kalliapseudes sp. Dental inn eboreum Kalliapseudes sp.A Dentaliurn texasianum Hargeria rapax Dentallun laqueatum Anthuridae sp. Anthuridae sp.A PHYLUM ARTHROPODA Cyathura polita CLASS MEROSTOMATA Apanthura magnifica Limulus polyphemus Apanthura cf signata CLASS PYCNOGONIDA Xenanthura brevitelson Achelia spinosa Eurydice littoral is Anoplodactylus petiolatus Paracerceis caudata CLASS CRUSTACEA Cymodoce faxoni Cladocera sp. Serolis mgrayi Myodocopa spp. Erichsonella cf attenuata Parasterope pollex Edotea tn'loba Podocopa spp. Munna reynoldsi Haplocythidea sp. Munna cf hayesi Haplocytherida setipunctata Metoponorthus sp. Copepoda spp. Amphipoda sp. Calanoida spp. Ampelisca abdita Harpacticoida spp. Ampelisca vadorum Cyclopoida spp. Ampelisca holmesi Macrocyclops albidus Ampelisca sp.B Semibalanus balanoides Gitanopsis sp. Balanus amphitrite amphitrite Ampithoidae sp. Balanus improvisus Ampithoe longimana Balanus venustus Cymadusa compta Mycidacea sp. Lembos smithi Mysidopsis bigelowi Lembos unicornis Mysidopsis bahia Lembos setosus Mysidopsis almyra Lembos spinicarpus inermis Mysidopsis furca Lembos rectangulatus ; Mysidopsis mortenseni Microdeutopus sp. Bowmaniella portoricensis complex Microdeutopus myersi Bowmaniella brasiliensis Acuminodeutopus naglei Metamysidopsis swifti Batea catharinensis Taphromysis bowmani Batea cf catharinensis Anchialina typica Cerapus sp.A Cumacea sp. Coroptiium lacustre Leucon sp. Corophium simile Leucon sp.A Corophium tuberculatum Oxyurostylis smithi Corophium louisianum Almyracuma sp. En'cthonius brasiliensis

24 Table 4. Master list of species Continued

Unciola serrata Panopeus herbstii Grandidierella bonnieroides Pinnotheridae sp. Elasmopus levis Pinnixa pearsei Gammarus mucronatus Grapsidae sp. Maera cf williamsi CLASS INSECTA Megaluropus sp. Chironomidae spp. Melita appendlculata Ceratopogonidae spp. Acanthohaustorius mi 11 si Coelotanypus spp. Photis pugnator Procladius spp. Photis sp. Tanytarsus spp. Photis melanicus Polypedilum spp. Microprotopus raneyi Listriella cf barnardi PHYLUM SIPUNCULA Lysi anopsis cf alba Sipuncula spp. Monoculodes nyei Phascolion sp. Synchelidium cf americanum Metharpinia floridanus PHYLUM PRIAPULIDA Eudevenopus honduranus Priapulida sp. Eobrolgus spinosus Stenopleustes cf gracilis PHYLUM PHORONIDA Podocerus sp. Phoronis architecta Parametopella cypris Stenothoe cf minuta PHYLUM ECTOPROCTA Tiron tropakis Bryozoa spp. Tiron triocellatus Caprella penantis PHYLUM BRACHIOPODA Paracaprella tenui s Brachiopoda sp. Luconacia incerta Glottidia pyramidata Trachypenaeus constrictu-s Lucifer faxoni PHYLUM ECINODERMATA Leptochela serratorbita Ophiolepis sp. Periclimenes longicaudatus Hemipholis elongata Alpheus floridanus Amphiuridae sp. Ogyrides alphaerostris Amphiodia pulchella Hippolyte pleuracanthus Amphipholis sp. Callianassa sp. Ophiophragmus sp. Paguridae sp. Ophiophragmus filograneus Paguristes hummi Ophiophragus wurdmani Pagurus brevidactylus Micropholis atra Pagurus carolinensis Micropholis gracillima Euceramus praelongus Axiognathus squamata Emerita portoricensis Echinoidea sp. Brachyura sp. Mellita quinqueisperforata Majidae sp. Holothuroidea sp. Libinia emarginata Leptosynapta sp. Portunidae sp. Leptosynapta inharens Portunus gibbesii Xanthidae sp. PHYLUM HEMICHORDATA Neopanope texana texana Enteropneusta sp.

25 Table 4. Master list of species Continued

PHYLUM CHORDATA SUBPHYLUN VERTEBRATA SUBPHYLUN UROCHORDATA Osteichthyes spp. Ascidiacea sp. Anchoa sp. Molgulidae sp. Gobiidae sp. SUBPHYLUN CEPHALOCHORDATA Gobiosoma bosci Branchiostoma sp. Symphurus plagiusa Branchiostoma caribaeum

Species Richness

Number of species per station for all collections ranged from 18 to 136 and averaged 58. All intertidal stations averaged 44 species per collection; mean species number per subtidal station fell from 74 (May 1980) to 65 (Sep­ tember) . Intertidal and subtidal stations with fewest number of species in May through June were station 11 (Estero Island; N=18) and station S-l (Peace River; N=36); most were found at station 8 (Blind Pass; N=110) and S-7 (lower Charlotte Harbor; N=131). Intertidal and subtidal stations with fewest number of species in September were station 5 (Boca Grande; N=21) and station S-5 (Pirate Harbor; N=29); most were found at stations 8 (Blind Pass; N=107) and S-7 (lower Charlotte Harbor; N=136). Table 5 summarizes station data. Supplementary Data III is a listing by stations of species ranked by density and percentage. Species number gener­ ally decreased from south to north and west to east, more so in May through June. San Carlos Bay and Pine Island Sound had an average May through June species count of 75 compared to 66 in Matlacha Pass; 62 in Charlotte Harbor; 54 in Gasparilla Sound; and about 38 species in the lower Myakka and Peace Rivers. In September, San Carlos Bay and Pine Island Sound had average species counts of 67 versus 62 in Matlacha Pass; 55 in Charlotte Harbor; 42 in Gasparilla Sound; and 33 in the lower rivers.

Benthic Macroinvertebrate Density Numbers of individuals per square meter ranged from 737 to 138,432. Mean density for all collections was 18,370 per m2 . Intertidal densities varied over a 10 percent larger range than did subtidal densities although their respective means were similar (18,160 per m2 versus 18,540 per m2 ). Compared to spring, mean intertidal density generally decreased except at station 10 and mean subtidal density decreased in September. Overall, densities in Myakka and Peace Rivers fell during the summer and Charlotte Harbor densities doubled. Intertidal and subtidal stations with lowest densities in May through June were stations 11 (737 per m2 ) and S-5 (1,733 per m2); highest densities were found at station 8 (80,430 per m2) and S-l (96,788 per m2 ). Two other sites with notably high densities were at station 10 (138,432 per m2 in September) and lower Charlotte Harbor (number S-7; 69,886 to 126,467 per m2 ). May through June densities are shown in figure 7. Intertidal and subtidal sites with lowest densities in September were stations 5 (895 per m2) and S-l (2,275 per m2); highest densities were found at stations 10 (138,432 per m2 ) and S-7 (126,467 per m2 ). September densities are shown in figure 8.

26 Table 5. Summary of faunal data by station

May through June 1980 September 1980 Number Density, Number Density, Station of No. per Equitability of No. per Equitability No. species square J 1 species square J 1 meter meter

1 32 21,998 0.47 23 8,277 0.54 2 46 9,148 .67 42 4,389 .69 3 37 24,111 .30 26 5,178 .53 4 38 2,079 .64 27 1,141 .80 5 19 998 .75 21 895 .73

6 47 1,728 .83 68 4,617 .79 7 52 2,438 .83 40 6,820 .71 8 110 80,430 .56 107 60,395 .53 9 32 5,938 .60 29 6,732 .64 10 57 11,709 .66 57 138,432 .17 11 18 737 .82 30 1,334 .81 S-l 36 96,788 .40 38 2,275 .74 S-2 38 7,022 .62 36 3,031 .73 S-3 40 21,598 .34 32 3,449 .65 S-4 48 6,737 .69 44 6,986 .63

S-5 50 1,733 .86 29 55,497 .48 S-6 69 4,960 .71 56 2,480 .73 S-7 131 69,886 .31 135 126,467 .45 S-8 82 6,524 .76 51 3,084 .76 S-9 109 7,208 .82 46 2,844 .70 S-10 68 5,555 .72 50 2,613 .84 S-ll 108 10,283 .64 135 22,824 .67 S-12 62 6,773 .74 66 4,568 .68 S-13 82 17,189 .71 73 5,919 .69 S-14 118 5,555 .85 112 9,359 .53

Equitability Species number and density are related to equitability, the evenness of a taxon's distribution compared with enumerated taxa. A sample in which all taxa are equally represented is perfectly equitable (J l=1.0 using method of Pielou, 1966). Values of J f approaching zero indicate numerical dominance by one or few species. Mean equitability for all collections was 0.65 +_ 0.16 and differed little if determined by depth or season. Stations with higher densities had lower equitability (figs. 7 and 8).

27 r \

82° 20' 82° 10' 81° 50'

To Snook Haven EXPLANATION THOUSANDS OF ORGANISMS PER SQUARE METER

Port Charlotte 27° Barro Coller (

Little Caspar! Ma 26° 50' Island Placida Causeway

SHADING INDICATES PERCENTAGE OF PERFECT EQUITABILITY (J f ).

26° 40' Useppa CayoUlJsl Costa

North (1<5A ~ Captiva\V°A \ Island

Capti va Island

26° 30'

Bay 10 KILOMETERS Point &£ Sanibel Ybel EsTero Island Island

Figure 7. Faunal density and equitability (J 1 ) in May and June 1980,

28 82° 20' 82° 10' 81° 50'

To Snook Haven EXPLANATION THOUSANDS OF ORGANISMS PER SQUARE METER

Charlotte 27° Barron Collier

Little Caspar! lla 26° 50' Island Placida Causeway

SHADING INDICATES PERCENTAGE OF PERFECT EQUITABILITY (J*).

26° 40'

Captiva Island

26° 30'

Sanibel Island

Figure 8. Faunal density and equitability (J ? ) in September 1980

29 Common Species

Commonality refers to number of occurrences of a taxon in samples. In this study commonality ranged from 1 (2 percent of possible 50 samples) to 48 (96 percent). Nemerteans and nematodes were the only taxa more common than 90 percent. Oligochaetes were 82 percent common; others were less common than 70 percent overall. Individual species (as opposed to higher taxa already mentioned) with 50 percent or more commonality included the ' flatworm, Stylochus sp. (50 percent); annelids, Capitella capitate, (60 percent) and Glycinde solitaria (68 percent); the gastropod mollusc, Acteocina canalicuiata (50 percent); and crustaceans, Ampelisca holmesi (56 percent), Haplocytherida setipunctata (54 percent), and Oxyurostylis smithi (56 percent). Other very common species (>40 percent) are listed below:

CNIDARIA ARTHROPODA Afhenaria spp. Crustacea ANNELIDA CoTophiwn louisi-anum Polychaeta Cyafhura polita Apoprionospio pygmaea Ericthonius brasiliensis Ar-icidea philbinae Grandidiere 1 la bonnieYO'ides Ax-iothella rnucosa Eargeria rapax Mediomastus ambi-seta Listriella cf. bamardi, Paraprionospio pinnata Parasterope pollex Pectinar-La gouldi-i- MOLLUSCA Bivalvia Amygdalwn papyriwn UyBella planulata Tellina versicolor

Commonality depended on season. For the taxa named thus far, about three- fourths became less common or remained as common from the spring to fall. It is interesting that 132 uncommon (defined as occurring fewer than five times in a collection) species were present in the spring collection but not the fall, and that 106 uncommon species were added to the fall collection. In both collections more species were uncommon than otherwise (table 6).

Table 6. Frequency distribution of species commonality

Commonality, Frequency number of May through September occurrences June

1 155 122 5 22 15 10 9 7 15 3 0 20 1 1 25 0 0

30 Dominant Species

Dominance within samples is a measure of a species' relative abundance. Abundance of the numerically dominant ("first") species, as percent of total individuals in a sample, ranged from 9 to 76 percent for all collections. Mean abundance of first species in May through June intertidal samples was 33.1 percent (+17.2 percent) compared to 30.1 percent (+22.1 percent) for subtidal samples. Numerical dominants of intertidal samples in May-June were mostly polychaetes and crustaceans whereas the numerically dominant species of subtidal samples were mostly polychaetes. Species most commonly found within the intertidal samples were: Apoprionospio pygmaea, Mediomastus ambiseta (Annelida); Amygddlwn papyriwn (Mollusca); Ampelisca holmesi (Crustacea). Mean importance of first species in September intertidal and subtidal samples were similar to earlier collections in both cases. Numerical dominants of intertidal samples were mostly molluscs and crustaceans; polychaetes, especially Paraprionospio pinnata, were the roost frequent subtidal dominants.

The number of species needed in addition to the numerically dominant one to represent 75 percent of all individuals in a sample varied from 1 to 34 in May through June and averaged about 7 and 12 for intertidal and subtidal collections, respectively. Representatives of additionally important spring species, in descending order of commonality, included: Tellina versicolor (Mollusca), Cumella sp. A., Ampelisca holmesi, Corophiwn louisianwn, Grandidierella bonnieroides, Parasterope pollex (Crustacea); Arcidea philbanae (Annelida); Amygdalum papyriim (Mollusca); and Haplocytheridia setipunctata (Crustacea). Other abundant species in September samples were Capitella capitata, Haminoea succinea, Pectinaria gouldii (Annelida); Tellina versicolor ."Mollusca); Acanthohaustorius millsi and Cyathura polita (Crustacea).

Species Groups Between Phyla

As neither the intent nor design of this study commend extensive comment on complex community structure, only two findings relative to species groupings in subtidal samples are noteworthy. First, no strong affinities between sets of species were evident where commonality, abundance, or relative importance were used as individual measures of grouping. Second, different areas of the estuarine system had characteristic species groups involving common or abundant species and some less dominant ones, but the groups were not strikingly different when only the common species were considered.

Upper and lower Charlotte Harbor areas provide examples. Communities found in upper harbor stations in May through June usually included Glycinde solitaria, Neanthes succinea, Streblospio benedicti (Annelida); Amygddlwn papyriwn (Mollusca); Ampelisca abdita, Grandidierella bonnieroides (Crustacea); and Chironomidae (Insecta). Lower harbor communities contained Mediomastus ambiseta, Spiochaetopterus costarum (Annelida); Acteocina canaliculata, Turbonilla conradi (Mollusca); Ampelisca holmesi, Listriella cf. barnardi, Oxyurostylis smithi, and Parasterope pollex (Crustacea). September communities in upper harbor stations usually included Glycinde solitaria, Minuspio cirrifera, Paraprionospio pinnata, Pectinaria gouldii (Annelida); Cyclostremiscus pentagonus (Mollusca); Ampelisca abdita (Crustacea). Lower harbor communities commonly contained Diopatra cuprea, Mediomastus ambiseta, Minuspio cirrifera (Annelida); Tellina versicolor (Mollusca); Ampelisca holmesi, Oxyurostylis smithi (Crustacea).

31 Species Groups Within Phyla

Abundance data for the September period were evaluated among molluscs, polychaetes, and crustaceans using Czekanowski's similarity index and classifica­ tion was performed using a group-averaged sorting method (Bloom, 1981). Five groupings of stations were generated from mollusc similarity with six stations left ungrouped, three in upriver areas and three near Boca Grande (fig. 9). The two largest groups occurred in the lower harbor. Sanibel Island mollusc assem­ blages were similar to those in Matlacha Pass and Pine Island Sound fauna resem­ bled San Carlos Bay groups. Gasparilla Sound stations were distinct, as were upper harbor subtidal assemblages.

Polychaete and crustacean groupings were less clear than molluscs but resembled one another by having harbor-wide assemblages (figs. 10 and 11). Subtidal polychaetes from the Peace River, Cape Haze shoreline, and Pine Island Sound were notably similar. Spotty similarity was noted for Myakka River stations and erratic patterns were generated for intertidal stations elsewhere, with only three stations left ungrouped. Crustaceans at subtidal stations were also broadly similar and formed one large group extending from the lower Myakka River through Matlacha Pass to San Carlos Bay. Intertidal station similarity among crustaceans was also high. Four stations were left ungrouped.

DISCUSSION

In a review of 1,500 benthic studies in coastal and estuarine waters of Florida, Mahadevan and others (1984) remarked that Charlotte Harbor is the least studied major estuary in the state. Objectives of this study were to assess methods and adequate station number and location; survey benthic infauna of the system; and identify patterns or trends in and between faunal assemblages.

Methods

A disadvantage in use of cores at depth was the need for divers. Ponar grabs did not always trip, sampled less deeply than cores, and sometimes spilled con­ tents on retrieval from shell-hash or cobble bottoms. Jordan (1978) recommended cores over grabs for"sampling infaunal sand communities in Tampa Bay.

The most critical aspect of either technique is replication and corresponding area of bottom sampled (Dennison and Hay, 1967). Species-area curves were examined for September samples from intertidal and subtidal areas. Cumulative species number vas plotted against cumulative sample area at stations 4 and 6. Station 4 had 27 species compared to 68 at station 6. In both cases the fifth replicate added new species equivalent to 5 to 10 percent of the station total. At a nearby subtidal station in Pine Island Sound (S-9; 46 species) the fifth replicate added 2 unique species (4 percent total). Upper harbor areas were sampled less adequately. Station S-3 (32 species) gained 5 species, or about 16 percent. Lists for S-2 and S-3 were analyzed together to estimate effects of increased sample area. Doubling replication (up to 0.22 m2 ) reduced accumulation of new species in the last (tenth) replicate to 5 percent. Up to 0.35 m2 may be needed to adequately sample upper harbor areas but actual effort can only be determined through new sampling.

32 82° 20' 82° 10' 82° 81° 50'

27'

26° 50'

26° 40'

26° 30'

Figure 9. Similarity of molluscan assemblages (Czekanowski's index), in September 1980.

33 82° 20' 82° 10 81° 50'

27'

26° 50'

26° 40'

26° 30'

0 5 10 KILOMETERS L 11 1 i I I I I 1 I

Figure 10. Similarity of polychaete assemblages (Czekanowski's index), in September 1980.

34 82° 10 82° 81° 50'

27'

ittle Caspar! I la 26° 50' Island

26° 40'

26° 30'

0 5 10 KILOMETLRS LL i 1 III 1 I I J

Figure 11. Similarity of crustacean assemblages (Czekanowski f s index), in September 1980.

35 Effect of Depth

The estuarine system of Charlotte Harbor is less than 3 meters deep in most areas; Gasparilla and eastern Pine Island Sound, and Matlacha Pass are shallower than 1 meter except in channels. Intertidal areas are expansive with 24,000 hectares vegetated by tidal forests and marshes (Harris and others, 1983). By comparison to these unstudied benthic areas, intertidal infaunal communities in Tampa Bay, a large estuarine system north of Charlotte Harbor on the Florida Gulf coast, are well studied. Intertidal species richness and density in Tampa Bay are lower than in subtidal areas; intertidal faunal assemblages are peripheral elements of subtidal communities but do exhibit similar patterns of recruitment and dominance (Bloom and others, 1972; Santos and Simon, 1974; Dauer and Simon, 1975).

In the Charlotte Harbor area, mean intertidal and subtidal depths were 0.6 meter and 2.6 meters, respectively. Most intertidal stations had fewer species than subtidal ones and there were few species which were strictly intertidal. Species richness at Blind Pass was exceptional (110 to 136 species) and is discussed in the next section. Intertidal densities ranged more than in subtidal areas and generally decreased over summer as did subtidal densities.

Station Selection

Intertidal and subtidal stations occupied in this study were exposed to a representative range of depth, current speed, fetch, and hydrographic varia­ bles. Middle Charlotte Harbor between stations S-3 and S-7 is a zone of rapid transition among these parameters and should have had additional stations. Manmade environments such as residential canals, navigation channels, and artificially nourished beaches were intentionally avoided, so new sampling in those areas may be useful. Blind Pass (station 8) had exceptional species richness among intertidal stations, which may be related to its evanescent nature: the pass opens and closes due to storms and longshore drift of beach sediments. The Pass was closed in 1980. The channel and flood-tidal delta east of the inlet had poorly sorted, coarsely skewed sand with moderate amounts of silt-clay and organics. This combination of factors acted as a favorable environment for a fauna already diverse from recent connections to the Gulf, and proximity to San Carlos Bay and shallow shelf waters where infaunal diversity is very high (Mahadevan and others, 1984). Faunal inter­ actions between inshore stations and oyster reefs or major seagrass meadows deserve study insofar as the roles of these other benthic habitats as refuges and sources of novel species in the Charlotte Harbor system are unknown.

Fauna

Estevez (1981) tabulated nearly 600 polychaete, gastropod, bivalve, and crustacean species from reports on Charlotte Harbor and adjacent waters, including oyster reefs and seagrasses. This study identified 486 species in the same 4 groups, out of 541 total species, from only soft bottom environ­ ments. Simon and Mahadevan (1985) opined that up to 1,500 species are represented in similar benthic environments of Tampa Bay, the nearest estuary comparable to Charlotte Harbor.

36 Seasonal and Aperiodic Changes in the Fauna

The 1980 water year was unusual insofar as tributary discharges were concerned. April, normally the month with lowest flows, had higher rates than other months. The wet season was the driest since 1961; accounting for small changes in salinity between May through June and September compared to wetter years (Estevez, 1981). In the Charlotte Harbor estuarine system, our sampling revealed high diversity at river mouths and inshore coastal areas for both seasons (table 5). Species number dropped during summer. In May through June density paralleled diversity (for example, middle harbor areas were transi­ tional) but in September the middle harbor had highest densities (figs. 7 and 8). Densities increased at 6 of 11 intertidal stations, and subtidal densities decreased in the lower river areas but increased in the middle harbor during summer. Species replacement was high in both collections.

Definitive long-term data are unavailable to confirm evidence for seasonality in benthic fauna within the study area. Environmental Quality Laboratory (1981) monitored one station in the upper harbor 1,800 meters from station S-3, beginning March 1976. Species richness averaged by calendar quarter was highest (11) in the fourth quarter (October-December) and lowest (7) in the third quarter (July-September). Mean quarterly density was highest in the second quarter (ending in June) and lowest in the third quarter. Our results from station S-3 in May through June and September parallel these findings. Greater diversity and density values from station S-3 compared with the Environmental Quality Laboratory station can be explained by increased sample area, although both sampling efforts in the upper harbor were probably inadequate. The 1976 through 1980 monitoring data near S-3 showed an increase in diversity in 1980 over prior years which is consistent with annual varia­ tion observed in Tampa Bay. Data on seasonality for other areas of the estuarine system are unavailable from any source, although our synoptic hydrographic data suggest the potential for an equally strong faunal response to seasonally varying salinity gradients in Pine Island Sound, as described below.

In September, density ranged from 20,000-40,000 per m2 in outer harbor areas to 4,000-6,000 per m2 in the river areas; inlets had lowest densities overall. This pattern contrasted to May through June when highest mean density (37,309 per m2 ) was in the Peace River (area 2). Richness and density data suggest that (1) infaunal patterns are associated with salinity and dissolved oxygen throughout the estuarine system, (2) hydrographic factors correspond to infaunal diversity and abundance better than sediment character­ istics, (3) sediment characteristics are important near inlets, and (4) the estuarine system may be divisible into subsystems reflecting different environmental conditions along latitudinal and longitudinal gradients.

Benthic infaunal communities respond to various rates of catastrophic (aperiodic, extreme) perturbations as well as annual cycles of change in estuarine conditions. Examples from Tampa Bay are several (Dauer and Simon, 1976; Conner, 1977; Santos and Bloom, 1980; Bell and Devlin, 1983). The configuration of a benthic assemblage depends in part upon the recency and severity of such disturbances. In Charlotte Harbor and nearby estuaine waters these disturbances include freezes, droughts and floods, and population

37 flushes of dlnoflagellates called red tide blooms. Estevez (1981) summarized their specific effects on estuaries and tabulated 24 red tides, 29 hurricanes, and 12 major freezes in the region since 1900. The probability of some part of the estuarine system being affected by at least one such disturbance in a year was 80 to 85 percent. A hurricane in 1972 and a freeze in 1979 preceded sampling in 1980 but their effects cannot be assessed relative to the present study because ante­ cedent data are lacking.

Spatial Patterns in the Fauna

Benthic infauna are affected as much by ranges of physical factors as by their instantaneous values (Boesch, 1977). Sediment data are available from Huang and Goodell (1967), but long-term or synoptic data on other factors (temperature, salinity, or dissolved oxygen) are lacking for most areas of the estuarine system. Granulometry of all areas was generally very similar except for Boca Grande and San Carlos Bay (table 7). On the other hand, bottom salinity and dissolved oxygen values were distributed as distinct gradients across subsystems (fig. 6, table 7). Trends in hydrographic and faunal data (figs. 6, 9-11) from September 1980 were used to delineate six ecological subsystems (fig. 12).

Table 7. Geographic subsystems of the study area [Mean size: f, fine; m, medium. Sorting: ms, moderately sorted; ps, poorly sorted. Skewness: ns, nearly symmetrical; cs, coarsely skewed]

Subsystem Property

Sediment

Mean size f m Sorting ms ms ms ms ms ps

Skewness ns ns ns ns ns cs Silt-clay, average 2.34 1.15 2.60 1.37 1.48 0.91 percent (± 2.45) (± 1.19) ( 3.23) (± .41) (± 1.23) (± 1.15) Organic content, .83 .95 1.18 .47 .63 1.17 average percent (± .57) (± 1.16) (± 1.32) (± .16) (± .27) ( 1.04)

Bottom water quality

Mean salinity, parts 11.5 11.9 25.3 22.8 28.6 28.5 per thousand (± 7.3) (± 6.5) (± 2.3) (± 4.2) (± 2.4) (± 2.1)

Mean dissolved oxygen, 3.3 4.5 4.6 4.7 5.2 5.3 milligram per liter (± 1.0) (± .6) (± .8) (± .7) (± .6) (± .5)

38 82° 20' 82° 10 81° 50'

Port Charlotte 27° Barren Collier EXPLANATION

SEPTEMBER 1980 MEAN

5670 4472 30.040 27,162 26° 50' 23,199 | Placida ___ 3668 Causeway Myakka Peace River and upper harbor Mid and lower harbor Pine Island Barrier Bayside w!^W]\^ 26° 40'

Captiva Island

26° 30'

Figure 12. Hydrographic and infaunal subsystems of the Charlotte Harbor estuarine system.

39 Distribution, commonality, and abundance data for infauna in the study area suggest that soft-bottom communities are points along continua of species combi­ nations rather than discrete entities (Boesch, 1977). Numerous species were common to many stations and occurred in more than one estuarine subsystem. The polychaetes Capitella capitata and Glycinde solitaria and the crustaceans Ampelisca holmesi, Haplocytherida setipunotata, and Oxyurostylis smithi were nearly ubiquitous. Combinations of common species are characteristic of faunal distributions along estuarine gradients, as illustrated in the Results section for upper and lower harbor assemblages. East to west differences in crustacean assemblages can be demonstrated for neighboring waters in the lower harbor (fig. 11). Mollusc assemblages varied most along a north to south axis (fig. 9) whereas polychaetes were common and abundant over large areas (fig. 10) but differed by species.

The number of species (species richness) was averaged for stations in each subsystem. In September, the average number was highest in subsystems 5 and 3, the Barrier Bayside and middle to lower harbor areas (80 and 63 species, respec­ tively) . Areas adjacent to the Barrier Bayside stations had the next highest values (Matlacha Pass, 60 species; inlets, 53 species) and river areas had fewest species (35-36). In May-June, the average number of species was highest in the Barrier Bayside and Peace River areas and intermediate in the central harbor. Recognition of geographic subsystems modeled after those proposed in figure 12 may be helpful in the design and interpretation of future studies of community structure. Differences in fauna between the Barrier Bayside and Pine Island zones, for examples, may be due to basic trophic differences among the species characteristic of the areas. Polychaetes more common in Pine Island Sound than elsewhere in the harbor included Ai"icidea philbanae, Scololepis texana, Polydora ligni, Scoloplos rubra, and Streblospio benedicti,; in the Barrier Bayside system Sabella melanostigmata, Prionospio heterobranchia , Carazziella hobsonae, and Polydora socialis occurred together. Molluscs were a characteristic element of Barrier Bayside assemblages and included OHvella minuta and 0. pusella, TelHna versicolor, Marginella ap^cina, and M. lavalleeana, whereas Acteooi-na eanaliculata and Tellina tampaensis were among the few mollusc species represented in the Pine Island subsystem. This pattern was reversed for common crustaceans in that most occurred in Pine Island and few were found in Barrier Bayside waters with regu­ larity. Pine Island crustaceans included Ampelisca abdita and A. holmesi, Mysidopsis bigelowi and Oxyurostylis smithi,.

The patterns for three major taxa throughout the whole study area revealed more clustering for molluscs than polychaetes or crustaceans. Clustering was particularly strong in the lower harbor which may be attributed to the higher number of mollusc species and individuals there. Pine Island Sound clusters resembled those in San Carlos Bay whereas Blind Pass was similar to Matlacha Pass, suggesting an effect of habitat exposure on the fauna. Mollusc clusters were not affected by depth whereas polychaetes and crustaceans were. In the two latter cases, similarity of the fauna was higher between subtidal sites than between subtidal and intertidal ones. Harbor-wide clusters of subtidal crustaceans was expected because of their mobility, whereas the same dispersion of a polychaete assemblage was a surprise. Clusters of crustaceans differed between Pine Island Sound and Matlacha Pass whereas polychaete clusters were more generally similar in both areas. The patterns thus described suggest that mollusc dispersion coincides best with harbor-wide gradients of hydrographic or sediment features and commend that group for monitoring projects of large geographic scope. Worms and crustaceans seem best fit for site specific comparisons where the isolated effects of one or another parameter are under study. Trends in species richness and density illustrate the transitional nature of zone 3, middle and lower Charlotte Harbor, between riverine and gulf coastal environments. Insights to infaunal dynamics along the salinity- dissolved oxygen gradients (and other unstudied ones such as particulate foodstuffs) apply to a relatively dry water year. More significant differences in benthic characteristics are expected when Charlotte Harbor and San Carlos Bays are freshened by greater discharges by their respective tributaries. It may be that salinity and its associated effects have more pronounced consequences in benthic communities accustomed to the least variation in those parameters, instead of those areas where variations are extreme but regular.

SUMMARY AND CONCLUSIONS

The first major objective of this investigation was to survey macroin- vertebrate infauna of the dominant bottom environment of the study area, namely the unvegetated, sandy benthos.

Collections during May through September of 1980, a water year in which spring was wetter and summer was drier than normal, produced 546 species of marine and estuarine invertebrates in 15 phyla. This list is larger than previously available for all benthic environments in the area but probably understates maximum diversity since no samples were taken in winter or from either the Caloosahatchee River or Estero Bay.

The second objective was to assess sampling methods and locations. Because of Ponar grab spillage, manual coring was preferred over grabs, even in subtidal areas. Total sample area of 0.10 to 0.20 meter is probably adequate for most parts of the estuarine system. The deep transitional areas from Cape Haze to Punta Gorda where anoxic conditions may be caused by strati­ fication will need larger sampling areas, as may adjacent areas during summers of wetter years. Intertidal sampling could be reduced and subtidal sampling increased, especially in the middle harbor area. Once hydrologic interactions between Pine Island Sound, Matlacha Pass, and San Carlos Bay are better known, addi­ tional stations would help document dynamics of their diverse infaunal communities. Having data on a station offshore Sanibel and Estero Islands would allow evaluation of shelf-estuary interactions. The third objective was to identify patterns or trends in communities. Subtidal areas had more species than intertidal areas and changed more over summer, from higher to lower species numbers. Density ranged greatly. Subtidal densities decreased during summer, especially in upper harbor areas. Density in mid to lower harbor areas increased during the same period.

41 Sediment characteristics were more similar across the study area than hydro- graphic features. Trends in diversity and density corresponded to salinity and dissolved oxygen gradients, and could be interpreted from both the observed and probable range and persistence of these gradients.

Most species were uncommon and numerically rare. Replacement of rare species was high between collections. Common species were often dominant. Combinations of these species occurred in areas of the estuarine system but in varying ratios. The roles of these species alone and in characteristic assemblages deserves attention. Overall, communities of the system are combinations of a broadly dispersed fauna rather than separate or coherent groups. Species number and density trended across the study area both latitudinally and longitudinally.

Similarity analysis revealed geographic clustering of molluscs and broadly dispersed assemblages of polychaetes and crustaceans. Mollusc groupings did not correspond to tidal position and both mollusc and crustacean similarity patterns distinguished Pine Island Sound from Matlacha Pass. Monitoring of harbor-wide subtidal areas would be feasible using only molluscs, whereas site specific analyses of polychaete or crustacean community structure would be helpful in assessing particular impacts of known origin.

Unvegetated sandy bottoms are the most common benthic environment of the Charlotte Harbor estuarine system and adjacent inshore waters and are populated by a rich macroinvertebrate infauna. Sediments of the area are structurally intact and relatively free of contaminants, except near residential canals and marinas, so patterns of benthic diversity or density can be related to natural events with greater certainty than in less pristine estuaries.

New infaunal studies in the area should turn to the trophic role of key species (Word, 1980); the role of infauna in controlling events within overlying waters (Cloern, 1982); and the nature of infauna communities in natural areas (oyster reefs and seagrass beds) and areas affected by man (residential canals, navigation channels, and petroleum-contaminated sediments).

SELECTED REFERENCES

Alberts, J. , Harriss, R., Mattraw, H. C., and Hanke, A., 1970, Studies on the geochemistry and hydrography of the Charlotte Harbor estuary, progress report No. 1: Sarasota, Florida, Mote Marine Laboratory, 28 p. Applied Biology, Inc., 1976, Ecological parameter monitoring at the Fort Myers Plant, Florida Power and Light Company: Atlanta, Applied Biology, 418 p. Barnett, B. S., Fernald, R. T., Goetsfried, A., and Lau, S. R., 1980, Fish and wildlife resources of the Charlotte Harbor area: Florida Game and Fresh Water Fish Commission, Office of Environmental Services, 211 p. Bell, S. S., and Devlin, D. J., 1983, Short-term macrofaunal recolonization of sediment and epibenthic habitats in Tampa Bay, Florida: Bulletin of Marine Science, v. 33, no. 1, p. 102-108. Bloom, S. A., 1981, Similarity indices in community studies: potential pitfalls: Marine Ecology Progress 'Series, v. 5, p. 125-128. Bloom, S. A., Simon, J. L., and Hunter, V. D., 1972, Animal-sediment relations and community analysis of a Florida estuary: Marine Biology, v. 13, no. 1, p. 43-56.

42 Boesch, D. F., 1977, A new look at the zonation of benthos along the estuarine gradient, in Coull, B. C., ed., Ecology of marine benthos: University of South Carolina, Belle W. Baruch Library of Marine Science, no. 6, p. 245-266. Cloern, J. E., 1982, Does the benthos control phytoplankton biomass in south San Francisco Bay? Marine Ecology Progress Series, v. 9, p. 191-202. Conner, W., 1977, Response of a soft bottom ecosystem to physical perturbation. Tampa, Florida, University of South Florida, Ph.D dissertation, 126 p. Cooke, C. W., 1945, Geology of Florida: Florida Geological Survey Bulletin No. 29, 342 p. Dauer, D. M., and Simon, J. L., 1975, Lateral or along-shore distribution of the polychaetous annelids of an intertidal, sandy habitat: Marine Biology, v. 31, p. 363-370. Dauer, D. M., and Simon, J. L., 1976, Repopulation of the polychaete fauna of an intertidal habitat following natural defaunation: species equilibrium: Oecologia (Berl), v. 22, p. 99-117. Dennison, J. M., and Hay, W. H., 1967, Estimating the needed sampling area for subaquatic studies: Journal of Paleontology, v. 41, p. 706-708. Environmental Quality Laboratory, 1981, Hydrobiological monitoring February 1980-February 1981 lower Peace River and Charlotte Harbor. Report to South­ west Florida Water Management District, 247 p. Estevez, E. D., 1981, Charlotte Harbor estuarine ecosystem complex, a summary of scientific information: Mote Marine Laboratory Review Series 3, 1077 p. Folk, R. L., 1974, Petrology of sedimentary rocks: Austin, Hemphill Publishing Company, 182 p. Foose, D. W., 1983, Selected flow characteristics of Florida streams and canals: U.S. Geological Survey Water-Resources Investigations Report 83-4107, 265 p. Fraser, T., 1981, Variation in freshwater inflow and changes in subtropical estuarine fish community, in Cross, R. D., and Williams, D. L., eds., Pro­ ceedings of the National Symposium on Freshwater Inflow to Estuaries, v. 2: U.S. Fish and Wildlife Service, FWS/OBS-8V04, p. 296-320. French, C. 0., and Parsons, J. W., eds., 1983, Florida coastal ecological characterization: a socioeconomic study of the southwestern region: U.S. Fish and Wildlife Service, Division of Biological Services, FWS/OBS-83-14, 333 p. Godcharles, M. F., and Jaap, W. C., 1973, Fauna and flora in hydraulic clam dredge collections from Florida west and southeast coasts: Florida Department of Natural Resources, Marine Research Laboratory Contribution No. 229, 89 p. Gunter, G., and Hall, G. E., 1965, A biological investigation of the Caloosa- hatchee estuary of Florida: Gulf Research Reports, v. 2, no. 1, p. 1-71. Harris, B. A., Haddad, K. D., Steidinger, K. A., and Huff, J. A., 1983, Assessment of fisheries habitat: Charlotte Harbor and Lake Worth, Florida: Florida Department of Natural Resources, 211 p. Huang, T., and Goodell, H. G., 1967, Sediments of Charlotte Harbor, southwestern Florida: Journal of Sedimentary Petrology, v. 37, no. 2, p. 449-474. Jordan, C. L., 1973, Climate, Chapter II A, in Jones, J. I., and others, eds., Summary of knowledge of the eastern Gulf of Mexico: State University System of Florida, Institute of Oceanography, p. IIA1-14. Jordan, W. R., 1978, Sampling a macrobenthic infaunal sand community in a subtrop­ ical estuary: Tampa, Florida, University of South Florida, Master of Science thesis, 89 p. Joyner, B. F., and Sutcliffe, Horace, 1976, Water resources of the Myakka River basin area, southwest Florida: U.S. Geological Survey Water-Resources Investigations Report 76-58, 87 p.

43 Mahadevan, S., Sprinkel, J., Heatwole, D., and Wooding, D., 1984, Review and annotated bibliography of benthic studies on coastal and estuarine areas of Florida: Florida Sea Grant College Report No. 66, 576 p. McNulty, J. K., Lindall, W. N., Jr., and Sykes, J. E., 1972, Cooperative Gulf of Mexico estuarine inventory and study, Florida: Phase 1, area descrip­ tion: U.S. Department of Commerce, National Oceanic and Atmospheric Administration Technical Report NMFS CIRC-368, 126 p. National Oceanic and Atmospheric Administration, 1981, Chart 11426. Pielou, E. C., 1966, The measurement of diversity in different types of biological collections: Journal of Theoretical Biology, v. 13, p. 131-144. Puri, H. S., and Vernon, R. 0., 1964, Summary of the geology of Florida and a guidebook to the classic exposures: Florida Geological Survey Special Publication No. 5, 312 p. Riley, J. P., and Skirrow, G., eds., 1975, Chemical oceanography: London, Academic Press, v. I, 2nd edition, 606 p. Santos, S. L., and Bloom, S. A., 1980, Stability in an annually defaunated estuarine soft bottom community: Oecologia, v. 46, p. 290-294. Santos, S. L., and Simon, J. L., 1974, Distribution and abundance of the poly- chaetous annelids in a south Florida estuary: Bulletin of Marine Science, v. 24, no. 3, p. 669-689. Simon, J. L., and Mahadevan, S., 1985, Benthic macroinvertebrates of Tampa Bay, in Treat, S. F., Simon, J. L., Lewis, R. R., and Whitman, R. L., eds., Proceedings of the Tampa Bay Area Scientific Information Symposium: Florida Sea Grant College Report no. 65, 663 p. South Florida Water Management District, 1980, Water use plan, Volume IIC, lower west coast: 225 p. Stoner, A. W., 1980, The role of seagrass biomass in the organization of benthic macrofaunal assemblages: Bulletin of Marine Science, v. 30, no. 3, p. 537-551. Taylor, J. L., 1974, The Charlotte Harbor estuarine system: Florida Scientist, v. 37, no. 4, p. 205-216. Texas Instruments, Inc., 1978, Preliminary geological report for the proposed DeSoto site development: Report to Florida Power and Light Co., 573 p. U.S. Department of Commerce, 1979, Tide tables for 1980, east coast of north and south America: National Oceanic and Atmospheric Administration NOAA S/T79-107, 293 p. U.S. Geological Survey, 1981, Water resources data Florida, v. 3A, southwest Florida surface water: Tallahassee, Fla. Van Vleet, E. S., Pierce, R. H., Brown, R. C., and Reinhardt, S. B., 1984, Sedimentary hydrocarbons from a subtropical marine estuary: Organic Geochemistry, v.6, p. 249-257. Wells, H. W., 1961, The fauna of oyster beds, with special reference to the salinity factor: Ecological Monographs, v. 31, 239 p. White, W. A., 1970, The geomorphology of the Florida peninsula: Florida Bureau of Geology Bulletin No. 51, 164 p. Whitfield, W. K., 1975, Mining of submerged shell deposits: History artd status of regulation and production of the Florida industries: Florida Marine Research Publication 11, 49 p. Word, J. Q., 1980, Classification of benthic invertebrates into infaunal trophic index feeding groups: Southern California Coast Water Research Project Annual Report, p. 101-122.

44 Supplementary data I.--Sediment formulae and statistics

Sediment statistics were determined by the following formulae from Folk (1974), where phi = -log x; x = particle size in millimeters.

A. Median = phi value at 50 percent level. B. Mean grain size (Mz) - overall size measure. Mz = phi* 16 + phi* r 50 + phi* 84

mm phi _____Class____

>2.0 <-l Gravel >1.0 < 0 Very coarse sand >0.5 < 1 Coarse sand >0.25 < 2 Medium sand >0.125 < 3 Fine sand >0.0625 < 4 Very fine sand <0.0625 > 4 Silt clay

C. Inclusive graphic standard deviation (sorting coefficient) (sigma), a measure of uniformity of sorting. sigma = phi 84 £-*- phi 16 -f phi 95 ^-f- phi 5

______Values______Degree of sorting

<0.35 sigma Very well sorted 0.35 sigma - 0.50 sigma Well sorted 0.50 sigma - 0.71 sigma Moderately well sorted 0.71 sigma - 1.00 sigma Poorly sorted 1.00 sigma - 2.00 sigma Poorly sorted 2.00 sigma - 4.00 sigma Very poorly sorted

D. Inclusive graphic skewness (Sk) - degree of asymmetry between central part of grain size composition curve and tail portions of the curve. , = phi 16 + phi 18 + 2(phi 50) phi 5 + phi 95 - 2(phi 50) 2 (phi 84 - phi 16) + 2 (phi 95 = phi 5) Sk values Degree of sorting

+1.00 - +0.30 Strongly fine-skewed +0.30 - +0.10 Fine-skewed +0.10 - -0.10 Nearly symmetrical -0.10 - -0.30 Coarse skewed -0.30 - -1.00 Strongly coarse-skewed

45 E. Graphic kurtosis (Kg) - ratio between sorting in tails of the granulometric curve and sorting of the new central portion of the curve. phi 95 - phi 5 Kg ~ 2.44 (phi 75-phi 25) Kg values Degree of kurtosis <0. 67 Very platykurtic 0. 67 - 0 .90 Platykurtic 0. 90 - 1 .11 Mesokurtic 1. 11 - 1 .50 Keptokurtic 1. 50 - 3 .00 Very leptokurtic >3. 00 Extremely leptokurtic Sediment characteristics for intertidal stations (1-11 collected June 1980) and subtidal stations (S1-S14 collected May 1980) . Silt- Station Median, Mean, Sorting, Skewness , Kurtosis , clay, Organics , No. phi phi sigma phi phi percent percent total total

1 2.48 2.45 1.04 -.11 1.24 3.69 3.65 2 1.57 1.59 .53 .16 1.23 .52 .43 3 2.03 2.03 .68 .03 .77 .63 .59 4 2.71 2.81 .61 .24 .88 1.82 .63 5 1.88 1.86 1.02 -.24 1.29 .23 .46

6 2.60 2.66 .55 .22 1.10 .42 .28 7 2.66 2.75 .65 .15 1.10 .98 .73 8 2.18 1.77 1.43 -.41 1.30 3.61 1.48 9 2.50 2.50 .60 -.04 1.54 1.07 1.86 10 2.52 2.50 .96 -.09 1.31 2.59 1.23 11 2.58 2.63 .69 .03 1.47 .38 .33 S-l 2.48 2.47 .76 -.01 1.34 2.31 .54 S-2 2.50 2.52 .73 .03 1.40 3.60 .86 S-3 2.84 2.84 .72 .03 .70 1.58 1.77 S-4 2.59 2.60 .59 .14 1.40 .09 .20 S-5 2.23 2.16 .70 -.10 .89 .29 .54 S-6 2.86 2.92 .68 .11 .78 3.46 .38 S-7 1.63 3.24 1.14 .36 .42 .30 1.53 S-8 -.78 -.60 1.12 .32 .98 .07 1.26 S-9 2.72 2.84 .76 .24 1.06 6.97 1.14 S-10 2.38 2.32 .65 -.10 1.26 .07 .28 S-ll 2.70 2.80 .61 .24 .87 .76 .35 S-12 3.36 3.27 .65 -.20 . 1.18 6.76 .29 S-13 2.59 2.65 .71 .05 1.29 .29 .43 S-14 2.42 2.02 1.35 -.14 0.52 5.13 1.32

46 Sediment characteristics for intertidal stations and subtidal stations (1-11 and S1-S14, respectively) collected September 1980. Silt- Station Median, Mean, Sorting, Skewness , Kurtosis , clay, Organics, No. phi phi sigma phi phi percent percent total total

1 2 .28 2. 29 1.06 .02 1 .10 5 .68 1.43 2 1 .62 1. 69 .55 .27 1 .13 .46 1.13 3 1 .80 1. 90 .67 .21 .80 .37 .27 4 2 .90 2. 96 .86 .05 1 .04 8 .32 3.22 5 2 .14 2. 05 .79 -.26 .95 .30 .39

6 2 .73 2. 79 .77 .02 .96 1 .35 .28 7 2 .61 2. 69 .71 .05 1 .46 .87 .49 8 .83 66 1.55 -.13 .78 .84 1.00 9 2 .52 2. 52 .61 -.04 1 .55 1 .39 .69 10 2 .43 2. 35 .72 -.11 1 .37 1 .60 .56

11 2 .84 2. 79 1.03 -.28 1 .31 .48 .48 S-l 2 .48 2. 48 .57 -.03 1 .42 .77 .75 S-2 2 .44 2. 39 .78 -.05 1 .30 2 .67 .65 S-3 2 .76 2. 67 1.15 -.29 1 .33 2 .92 2.64 S-4 2 .54 2. 54 .53 .05 1 .31 .54 .12

S-5 2 .25 2. 17 .69 -.13 .91 .67 .22 S-6 2 .66 2. 75 .71 .10 1 .14 1 .78 .35 S-7 .10 45 1.43 .34 1 .28 .86 1.82 S-8 .73 . 62 1.32 -.10 .88 .23 1.19 S-9 2 .86 2. 91 .62 .13 .76 .46 .34

S-10 2 .26 2. 20 .76 -.03 .96 .89 .28 S-ll 3 .07 3. 03 .66 -.09 .74 3 .23 .48 S-12 3 .16 3. 09 .63 -.17 .76 1 .72 .70 S-13 2 .62 2. 70 .64 .16 1 .24 1 .78 .48 S-14 2 .19 1. 78 1.73 -.34 .74 2 .63 .88

47 Supplementary data II.--Hydrographic characteristics

Salinities were computed from conductivity, and dissolved oxygen data were corrected for salinity and temperature on the basis of relationships given by Riley and Skirrow, 1975 (p. 561-562).

Numbers 1-11 and S1-S14 denote intertidal and subtidal stations, respectively. Depths are given as: S, surface; M, mid-depth; B, bottom. Salinity units are parts per thousand ( /oo).

A. Intertidal stations

June 16. 1980

Corrected Station Temperature , Salinity, dissolved oxygen, No. °C /oo mg/L

1-M 25.6 10.5 5.3 2-M 25.7 28.2 5.1 3-M 26.3 29.5 5.3 4-M 25.8 18.0 5.6 5-M 26.3 13.0 5.9

6-M 26.3 24.8 6.9 7-M 26.3 28.5 6.4 8-M 25.5 27.0 5.0 9-M 25.7 26.0 5.6 10-M 26.3 25.1 5.5

11-M 26.1 25.4 9.9

September 16. 1980

Corrected Station Temperature , Salinity, dissolved oxygen, No. °C /oo mg/L

1-M 28.2 4.1 3.2 2-M 28.5 6.9 4.7 3-M 28.0 14.2 4.1 4-M 28.6 25.0 3.7 5-M 28.1 27.2 4.6

6-M 28.6 25.6 4.3 7-M 28.0 26.6 4.4 8-M 28.5 27.0 4.7. 9-M 29.0 26.1 5.9 10-M 28.5 25.3 5.2

11-M 28.0 26.3 5.9

48 B. Subtidal stations

May 15. 1980

Corrected Station Temperature , Salinity,0 , J ' dissolved oxygen, No. °C /oo mg/L

Sl-S 28 .0 17 .4 5 .4 Sl-B 28 .0 18 .0 5 .6 S2-S 28 .0 21 .0 5 .9 S2-B 27 .5 21 .2 5 .2 S3-S 27 .5 21 .5 6 .1

S3-B 26 .0 22 .6 5 .2 S4-S 27 .5 24 .2 6 .7 S4-B 26 .0 25 .0 4 .3 S5-S 28 .0 25 .6 6 .4 S5-B 27 .5 26 .2 6 .2

S6-S 27 .5 31 .6 5 .6 S6-B 27 .3 31 .9 5 .8 S7-S 27 .0 33 .5 6 .9 S7-B 27 .0 32 .8 6 .7 S8-S 26 .0 33 .6 6 .5

S8-B 27 .0 34 .0 5 .7 S9-S 27 .5 32 .8 6 .6 S9-B 27 .4 32 .8 6 .5 S10-S 28 .5 23 .4 6 .4 S10-B 28 .4 23 .5 5 .6

Sll-S 26 .8 33 .3 6 .6 Sll-B 26 .8 33 .5 6 .6 S12-S 27 .5 31 .0 6 .3 S12-B 28 .0 30 .7 5 .6 S13-S 28 .1 23 .9 6 .2

S13-B 27 .6 24 .1 5 .9 S14-S 26 .5 33 .5 6 .1 S14-B 26 .5 33 .5 6 .2

49 September 16. 1980

Corrected Station Temperature , Salinity, dissolved oxygen, No. °C /oo me/L

SI -S 29 .5 5. 1 4,,2 S2 -S 30 .0 10. 1 6..2 S2 -B 29 .0 15. 2 2,,6 S3 -S 30 .0 17. 3 7 ,3 S3 -B 28 .5 18. 5 4,,3

S4 -S 29 .0 18. 3 7..4 S4 -B 28 .5 19. 8 2,.7 S5 -S 29 .6 21. 9 5..4 S5 -B 29 .2 22. 0 5,,4 S6 -S 29 .0 27. 4 4,,3

S6 -B 28 .5 28. 3 4,,1 S7 -S 29 .0 23. 4 6,,2 S7 -B 28 .5 25. 7 5..6 S8 -S 29 .0 30. 1 5.,3 S8 -B 28 .1 30. 6 5..1

S9 -S 28 .9 30. 5 5,.4 S9 -B 28 .9 30. 8 5,.3 S10 -S 29 .5 15. 6 4,.4 S10 -B 28 .5 17. 2 4,.1 Sll -S 28 .5 27. 7 6 .3

Sll -B 28 .5 29. 4 4,.8 S12 -S 28 .5 24. 3 6 .1 S12 -B 28 .5 24. 3 5,.9 S13 -S 29 .0 17. 7 4 .4 S13 -B 29 .0 17. 7 4,.4

S14 -S 28 .5 29. 0 5 .5 S14 -B 28 .1 29. 9 5 .4

50 Supplementary data III.--Station reports of species ranked by density and percent total station density

EXPLANATION

cf .... similar to the specified taxon sp . . . . a distinct but unnamed form in the specified taxon spp. ... a group of distinct but unnamed forms in the specified taxon t. . . . . trace occurrence, always less than 1.0 percent of total station density

51 4i 41 4i 4-1 4^ -p4Ji4Ji4Ji4Ji4J.+J<4J. ^-* i S -S ^ c u3 uj Ul 4i 4- 4^ 4i s is r^ ! *i T-) Pui 0

Kj U3 OJ 5 CT» IS IN CTi 04 IS S 04 Ui 1-1 Ui TI U3 u3 Oj CO Cn N cn *-« cu cn 03 is s eg eg 04 r^ r^ kD CQ 03 S S Q S Ul Ul |S TX JN IN jN fv fx ^ -t rs 03 t-1 03 TI ^ W is »-i eg cn s *-i cn ui eg *-« Q s s 03 CQ yi >t -t ivj fVJ M !VJ «-i ~* »i eg OQ rs in s in ifi 03 M m -M C 0 U3 uQ 04 -i 03 0"i CQ U3 kO TO M «-« cu jz; u. 03 04 03 FS r*-* PO OJ

CN ift o; LO 01 4- a> *o 03 T3 >-^ 2 1-1 4J 1/1 ^ ^ I/I -i ^1 o Q 0 a Q 0 cn k ~c i/i T3 cn v Ui Ul 0) cc Hi n c ^ a ill X "QQi Ci - « 4- -2' Oi Q> cti a U 2 C .-i :--! o C C r-i ^ +i 03 C 3 £ 03 ri 0 >» 03 0 i. 13 » Oi r-\ » »-| -t_i 1 03 0 4i fJJ rl C o .--i H a =-1 -Q Qi Ql Ci. i/l .-i » Q i/i flG 03 cr. ^ P IB U 03 C I/I 03 i/i » > C O. OJ > 4i Cl. U'l 03 ^-! .1 ^ > 0 "13 4- « 4i 03 05 ! 1 6 Q i^ p o i 03 1-1 Ql i/l 4^ n 03 03 » !/! X 0. « » 03 C » * U i/i -1 jl^ . i r-i 03 1 X L » 03 c 1 3 1-1 3 -Q 03 » -! Ci OG i/i 03 ij > Ci. 4^ 03 Cl. Q. Ul * ID --I 'Ti I 03 rj 3 "Q .--i CJ. 01 15 » 0. ..Q o CC C 15 "Q * O. 0 1 CJ « a ai .--! » Ql « 0 -i 0. l/l L 0. , .-i t 0. i/i 03 jQ Cl. Cl. 0 r,, r~! U 03 ij CJ 03 £ a - a 03 4J > Ci. Ci. cti i~i ~i Oi » 0 l/i 03 0 Cl . ri Q . n 5^ l/| » Ol 03 03 £ 03 Cl. » Ol » U'l !/! £t 0. 0 * ill U) , 04 l/l Q Oi 03 ai « CJ « 03 I/I Ul i/! r-1 . i » L l/i -! 3 13 0. i/l «i Ifl -si Hi t i/l £. iL 4i 0 If! 03 C Ul » » » Ul C 0. i, r-l 03 ^ , » L Ci. » ifi -^ » » -3 2J S Ql -1 0. *4^ --i I/I > 03 D 2^2 a OJ Ql !/l 03 -r, r-! 03 03 .C 5-1 3 rl Q| tfl » S 03 Ul 03 fC S Hi 'Tj 0 Q U! CJ. C S 03 Ql , 03 M- 0 Q » ~3 , U ^ » -i Q. Ql i C 03 0 Q M .-i a i. G 03 C k rl S, 5k » X £. Q- 2 ^ .£ 0 -1 Q 0. » 0 0 --i U Q k 03 £ * i/i -I 03 r-t 03 U! TI 03 i i Qi 1-1 3 i r-j i-s -C »1 Ql r-i 1-1 £ 3 > 0 0 03 Cl Cl 0 Ql Jk U C c; 0 U Oi 0 (J 4* I/I U » Ql -! Ul Qi | > r-t f|J 1-1 .1 -i-i 1 1 Ql <~i £ X 4^- 03 M ~i 03 0. 5, i Q 0 S, U 4^- 03 Cl 4-1 r. s CC r-l 13 1-1 ID r-1 4J U "Ti £ L Q H fll 3i i» 41 Oi >, >, 4i r-i 1-1 (Ti G Qi 01 C ill 4-. ai .-i T3Q|i-«njCOJ-nQi Ql r, r-1 S Q Ql -=1 H 0 C 0 g . -i Ql C Hi O cn Sk 03 Qi S. >-. « 03 > r~! -! 0 Q. X4^ C !U 'i 3 1 0. Ui £ i/i os^s^s^s. cn x x i/i O. 03 S Q. G 2 03 S S 0) r-I Q 0 13 Oi 4i i-l 03 03 > ! 03 0 fC 03 X X Qj 0 Ql 2 3 Q| Q| 0 >^ S i* ~2 03 U 0 S, Ol Qi Pu 0 k 03 0 03 a CO * U CD ^| cn cn Q u iii a ex m I cn CD a x Q > 04 G CD '-t; E; E2CQ2EQ22 a * cn a E CC CD G G cn tt 04 2 cn Density Per- Species or taxonomic category (No./m2 ) cent

* STATION 2 - DRY SEASON Aeteoeina. canal iculata 1 05. S5 1 Edotea. tri 1 oba 96.48 1 Haplocytherida. setipunetata 78.93 1 Vaunthowsonia. sp. 78.93 1 Tel lina. alternate 61. 39 1 Neroatoda. spp. 61. 39 1 Paraprionospio. pinnata 61.39 1 Qxyurosty 1 i s. sroi thi 5£r. 6£ 1 Laeonereis* culver i 43.85 t Pectinaria. gouldi i 43.85 t St rebl ospi o. bened i et i 43.85 t Tel 1 ina. spp. 43.85 t Mysi dopsi s. alwyra 35.08 t Luei ni dae. sp. 35.08 t Het erowast us. f i 1 i f orwi s 35.08 t Hargeria. rapax £6. 31 t Coroph i UJM. 1 ou i si anuro 17.54 t Mysi dopsi s. f urea 17.54 t Eteone. heteropoda 17.54 t Glycinde. sol itaria 17.54 t Mi trel la. lunata 1 7. 54 t Liwulus. polyphemus 17.54 t My si dopsi s. bahi a 17.54 t Lei toseol opl os. sp. 8.77 t Pirmixa. pearsei 8. 77 t Nearithes. sueei nea 8.77 t Maeomidae. sp. 8.77 t Corbula. contracta 8.77 t Beukensia. deiaissa. granosissima 8.77 t Cyathura. pol ita 8.77 t Ampel isea. holmesi 8.77 t Ol igoehaeta. spp. 8.77 t Cal 1 i anassa. sp. 8.77 t Spiophanes. bcunbyx 8.77 t

* STATION 3 - DRY SEASON Grarididierel la. bormieroides 1 8375. £4 76 Amygdal uw. papyri UM £-359. 39 10 Cyathura. pol ita 964.81 4 Arapel i sea. abdi ta 675. 36 3 Nemert i na. spp. £ 36. 81 1 Coroph i um. louisiaruiM 1 84. 1 9 1 Neanthes. sueei nea 1 49. 1 0 1 Bowmani el 1 a. brasi 1 i ensi s 1££. 79 1 Hargeri a. rapax 1 1 4. 0£ t Peetinaria. gouldi i 1 1 4. 0£ t

53 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION 3 - DRY SEASON Stylochus, sp. 96,48 t Pol ydora, soci alas B7-71 t Laeonerei s, cul vera Bl , 39 t Dl ioochaeta, spp- 5£, fe£ t Se/wi bal anus- balanoides 43, S5 t Heterowast us, fa 1 a f oriwi s 43, 85 t Mysel la, pi anul ata 43, 85 t Li mul us, polyphemus 35. ®8 t Capi tel 1 a, capi tata 35, ®8 t dime 1 la, so, A 35,08 t Pol ydora, sp. £&, 31 t Acteoci na, canal icul ata *?6, 31 t Hapl ocytheri da, set i punctata £&, 31 t Mediomastus- cai a f orniensis £&, 31 t Gl ycinde, sol i taria ££>, 31 t Mysi dopsi s, f urea £6,31 t Edotea. triloba 1 7, 54 t Balanus, iwprovisus 1 7, 54 t Geukensia, demissa- granosissiwa 1 7, 54 t Ham a noea, succa nea 8,77 t Ga tanopsas, sp. 8,77 t Neopanope, t ex ana- t ex ana 8,77 t Nerea dae~ sp. 8,77 t Eupl ana, Draci las 6,77 t Gawwuarus, wucronat us 8,77 t Brachyura, sp. 6,77 t Ma coma, so. 8,77 t

* STATION 4 - DRY SEASON Capi tel la, capi tata 824, 47 40 Prionospao, heterobranchia 377, 1 5 18 Aricidea, phi Ibinae 1 1 4. 0£ 5 AM pel a sea, hoi mesa 96,48 5 Neanthes, succinea 96,48 5 Heterowast us, fa 1 a f ormi s 96,48 5 Dl iDochaet a, spp. 61, 39 3 Neroert i na, spp. 52. B2 3 Tharyx, sp. 26, 31 1 Tel 1 i na, versa col or £6, 31 1 Cyathura, pol it a £6- 31 1 Ar i ci dea, f rao i 1 i s 1 7. 54 1 Scololepis, t ex ana 1 7, 54 1 Kal 1 a apseudes. sp, A 1 7, 54 1 Grandidierel la, bonnieroides 17,54 1 Nematoda, spp. 17,54 1 Spiophanes. bowbyx 8,77 t

54 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION 4 - DRY SEASON Semi ba 1 anus, ba 1 anoi des B-77 t Abra. aeq ua 1 i B B. 77 t Hoi othuroi dea. sp. B-77 t Lei toscol opl os- f ol i OBUB B. 77 t Anodont a a. al ba B-77 t Aropel isca. abdi ta B. 77 t Lei toscoloplos. frag a 1 is B- 77 t Sabel 1 a. me 1 ano&t i guiae B. 77 t Awygdal uxo. papyri uw B- 77 t Card a tamera. floridana B. 77 t Cerapus. sp. A a. 77 t Polydora. social is a, 77 t Geukensia. demissa. granosi Beawa a- 77 t Erycina- sp. a. 77 t Margine! la* apicina a. 77 t Bl yea nde. BO! a t ar i a a. 77 t Hargeria- rapax a. 77 t Laevi eardi urn. wortom B. 77 t Ehlersia- cornuta a, 77 t Apoprionospio. pygroaea B, 77 t Hesa oni dae- sp. S-77 t

* STATION 5 - PRY SEASON Di&pio. imrariata 427- 63 43 Spi o* pett i boneae B7-7£ 9 Capi tel 1 a. capital- a 76,75 a Minuspio* cirrobranchiata 65. 79 7 Streptosyl las. pett i bone a e 54. B£ 5 Branch iostoma. caribaeuro 3£- B9 3 Phoronis- architecta 32. B9 3 Donax. var a abi 1 i s 32- S3 3 Nematoda- spp. £1.93 £ Tiron, tropakis £1.93 £ Protofliystades. ba dent at a £1.93 £ Ol igoehaeta- spp. £J.93 £ Bowmani el 1 a. bras. a 1 i ensi & £1.93 £ Cyathura- polita £J.93 £ Eudevenopus. bonduramis 10.96 1 Chone. sp. 10.96 1 Cyel aspa s. sp. B 10.96 1 Nemert i r*a« spp« 10.96 1 DphiophragwiuB. f i lograneus 10.96 1

55 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION 6 - DRY SEASON Apopr i onospa o, pygmaea £45- 5B 14 Tel 1 ir»a, versa col or £19, £7 13 Spiophanes, bowbyx 1 49, 1 0 9 Acantboftaustora us, mi 1 Isi 131,5fc B Haplocytherada, seta punctat a 1 1 4, 0£ 7 Neroert i r*a, spp. 1 05. £5 B Cyatbura, polita 70, IB 4 Am pel i sea* bo lines a &1.39 4 Oxyurostyl is, smith a 5£, 6£ 3 Bowmar»iel 1 a. brasa 1 aer»si s 5£, &£ 3 Spionadae- sp- £&, 31 £ Morioculodes, nyei £&, 31 £ Glottadaa, py rain i data £&, 31 £ Orbi r»a i dae, sp. £6, 31 £ Luca ria, sp- £&, 31 £ Mysel 1 a, pi ariul at- a £6. 31 £ Glycera, ainera car»a £&. 31 £ Kinbergonuphi s« simor»i 1 7. 54 1 Brachiopoda. sp. 1 7. 54 1 Acteoci r»a» canal icul at a 1 7. 54 1 Parasterope, pel le.x 1 7, 54 1 Alpheus, f loridanus 17.54 1 Nassar-i us, al bus 1 7, 54 1 Pol ydora, 1 a oni 17,54 i La str-a el 1 a, cf . bar-nar-da 17.54 1 Wul ina. 1 at era 1 i s 17.54 l Polydora. soca al is S. 77 l SyncDel i da ui». cf , aroera canuw 8. 77 1 Elas/nopus, lev as S, 77 l Nematoda, spp. B. 77 i Spiochaetopterus, costaruw. oculatus B. 77 1 Act a nara a. sp. S. 77 1 Olagochaeta, spp- S, 77 1 Pinnixa. pearsea S. 77 1 Balanus, awprovasus S, 77 1 Ensi s, mi rior B. 77 1 Branch a ostoma, carabaeum B. 77 1 Wel 1 a ta. qua nouea sperf orta B. 77 1 Terebel 1 a dae, sp. B. 77 1 Laevacarda uro. sp. B. 77 1 Wyodocopa. spp^ B. 77 1 Nat a ca dae. sp. B. 77 1 Cbone. ameracana B, 77 1 Lea toscoiopios, fraoalas B. 77 1 Eudevenopus, bond ur anus S, 77 1 Caul 1 era el la. sp. B. 77 1 Blyca nde. sol a tar a a S. 77 1

56 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION 7 - DRY SEASON Ol ioocbaeta. spp. 350. 84 14 Microptbalwus. sczelkowii £36. 81 10 Nematoda. spp. £1 9. £7 9 Axiotbel la. wucosa 149. 10 6 Capi tel 1 a. capi tat a 1££. 79 5 Polydora. social is 114. 0£ 5 Ol i vel 1 a. winuta 96.48 4 ftsycbis. elongata 87.71 4 Eteone. beteropoda 78.93 3 Newer t i na. spp. 78.93 3 Lei toscolopl os. fragilis 78.93 3 ft w pel isca. abdita 70. 16 3 Pri onospi o. beterobrancbi a 70. 16 3 Acteocina. canal icul ata 61.39 3 Hargeria. rapax 61.39 3 Neantbes. succinea 43. 85 £ Parastarte. triquerta 35.08 1 Lei toscolopl os. foliosus 35. 08 1 Lyonsia. byal ina. floridana 35. 08 1 Bi val via. spp. £6.31 1 Pol ycl adi da. sp. £6.31 1 Arenicola. cri stata 1 7. 54 1 Crepidula. pi ana 1 7. 54 1 Vauntbowsonia, sp. 17.54 1 Edotea. tr i 1 oba 1 7. 54 1 Tel 1 i na. tawpaensi s- 17.54 1 Kal 1 i apseudes. sp. ft 17.54 1 Exooone. atlantica 17.54 1 Newer t i na. spp. 1 7. 54 1 Scololepis. t ex ana 17.54 1 Coropbi uw. 1 oui si anuw 1 7. 54 1 Typosyl 1 i s. cf . 1 utea 8.77 t Tbaryx. sp. 8.77 t Podarke. obscura 8.77 t Ol i va. sp. 8.77 t Turboni 1 1 a. sp. 8.77 t Laeonerei s. cul veri 8.77 t Glottidia. pyrawidata 8.77 t Pbascol i on. sp. 8.77 t Diopatra. cuprea 8. 77 t Het erowast us. f i 1 i f orwi s 8. 77 t Ericbsonel la. cf . attenuate 8. 77 t Macrocy clops, a Ibid us 8. 77 t Aricidea. fragilis 8. 77 t Col uwbel 1 i dae. sp. 8. 77 t Copepoda, spp. 8.77 t Cbi one. cancel 1 ata 8.77 t

57 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION 7 - DRY SEASON Margi nel 1 a. apacina 8.77 t Kanber&onuphas. samona B. 77 t Mysel 1 a. pi arm 1 ata 8. 77 t Aroycjdal uw. papyra urn B. 77 t Card a tamer a. floradana 8.77 t

* STATION 8 - DRY SEASON Kal 1 a apseudes. sp. A ££7£5. 66 JC.O Pol yd or a. soca alas 9£6£. 1 7 1£ Ampel a sea. boi mesa 9£09. 55 11 Ki nberoonupttas. samona 66££. 1 0 S Coropbi urn. 1 oua sa anum 5£45. 05 7 Hargera a. rapax 51 9£. 43 6 Fabraca a. sabel 1 a 3850. 46 5 Neantbes. acuroinata 3043. 53 4 Ax a otnel 1 a. mucosa £:i=?.*>6.. ..--. * .. 60f j-v 3 Pra onospa o. beterobranchi a 1973. 47 £ Myodocopa. spp. 1 07B. 83 i Oxyurost yl a s. sma tha 8£4. 47 l Enlersaa. cor nut a 806. 93 i Neroatoda. spp. 798. 16 1 Capi tel la. capa tat a 727. 99 1 Cuwel la. sp. A 587. 65 1 Ampel a sea. abda ta 41£. £3 1 Nemert a na. spp. 403. 46 l Branda da erel 1 a. bonna eroa des 385. 9£ t Scol ol epi s. t ex ana 385. 9£ t Caul 1 era el 1 a. sp. 333. £9 t ExoDone. at 1 ant a ca 306. 98 t Lyonsi a. nyal ana. f ioradana £89. 44 t ft "t" -fa&yjisk Y* Jl el SOO £80. 67 t Mysel 1 a. pi anul ata £54. 35 t Cborce. aweracana £1 9. £7 t Laeonerea s. cul vera 1 49. 1 0 t Ol a vei 1 a. pusa 1 1 a 140. 33 t Cyathura. polita 131.56 t Tharyx. sp. 1££. 79 t Ol aoochaeta. spp. 1 ££. 79 t Acteocana. canal a cul ata 1 1 4. 0£ t Pbascol ion. sp. 1 05. £5 t Crepa dula. maculosa 1 05. £5 t Maoel ona. pett a borieae 1 05. £5 t Copepoda. spp' 96.48 t Edotea. tra 1 oba 87. 71 t Phyl lodoce. castanea 78. 93 t Parastarte. traouerta 70. 1 6 t

58 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION B - DRY SEASON Act eon. punctostriat us 70. 16 t Turboni 3 3 a. da 3 3 i 70. 16 t Ant h ura dae. sp. A 61.39 t Hap3 ocyt fieri da. set i punct at a 61. 33 t Sty 3 ochus. sp. 5£. 6£ t Lysi anopsi s. cf . a3ba 5£. 6£ t Ar i ci dea. ph i 3 bi nae A3.85 t Eteone. fieteropoda A3. 85 t Sco3 op3 os. rubra A3. 85 t Laevicardi HOT. wort on a 35. 08 t Lei tosco3op3os. fragi3is 35.08 t Eri ctfioni us. brasi 3 a ensi s 35. 0S t Brani a. c3 a vat a 35. 08 t Mysidopsis. furca 35. 0S t Margine3 3 a. apicina 35. 08 t Ampfia uri dae. sp. 35. 08 t Ci rr i forma a. sp. 35. 08 t Nassari us. vi bex £6. 31 t Tharyx. sp. £6.31 t Lei t osco 3 op3 os. f o3 i osus £6.31 t By pt i s. br e v i pa 3 pa £6. 31 t Leptosynapta. sp. £6.31 t Prosthiostowuw. sp. £6. 31 t Ampfii uri dae. sp. £6.31 t Saye3 3 a. f usca £6.31 t Leitosco3op3os. sp. 17. 5A t Paracerceis. caudata 17. 5A t Tapfirowysi s. bowman a 17. 5A t Heteromast us. f i 3 i f orwi s 17. 5A t Opfiiophragmus. fi3oDraneus 1 7. 5A t Pnama3ocardia. auberiana 17. 5A t Bowmani e3 3 a. brasi 3 i ensi s 17. 5A t Vi tri ne3 3 i dae. sp. 17. 5A t Para ster ope. po3 3 ex 1 7. 5A t Paracapre3 3 a. tennis 1 7. 5A t Ci rropfior us. 3 yra 17. 5A t St rept osy 3 3 i s. pet t i boneae 17. 5A t Listrie3 3 a. cf. barnardi 17. 5A t Nassari us. a3 bus 17. 5A t Mediomastus. sp. 17. 5A t Me3 inna. macu3ata 17. 5A t Meg a 3 uropus. sp. 17. 5A t Mega 3 omwa. bi ocu3 at a 8.77 t Boguea. enigmataca 8.77 t Mysi dopsi s. bi ge3 owi B. 77 t Acumi nodeutopus. nag3ei 8. 77 t Saye3 3 a. crosseana 8.77 t

59 en rn & r/i x rn CD D n n H 3D CD 2 TI t? 3D H *^ *t * tO H HI CD nt)tnt)XjnDntj3DXjn3D23DH3Dr/int3* T 3 ? H3 "0 ^ i/i o x 3" n ^ to to to T X ID to < c *j to i50iD000^0030'<3'D5iD3nib t-1 (D u> n o 31 rt u to rt ^ to to rt to *5 D" *5 *"*' "D * ' ^$ to S to S~J 3 rt i > \ i jj- i > wj -Q i_ > 3 * < l~'"D *~J 0 3"*? to to o 3 "5 10 H- n 3 w to tl *1 3 ID 0 rt ^ ID 3 IP 1 to n o to ID H «- CT 3 5 I/i f- IB to X X *- X X 3" ^ O ip w. w- t-j Q. ui- gj rt ^ D" Oi rt ID "S n c «- "D 3" X n D. ^ |J- i/i « in 3 ID to u- n r- «i) n 3 fc-s-D'D 3 n n u n a a ^ rt- «-. Q in -OK to (D I/! >-- 3" «- 3 n rt rt T H a 3 *- T U-U-IB u-« >uju- « >i > '15 «-"-0 to to 3"3 3 rt-c 3"H f"i 0 T n 3" c * n CL ^ n n n i-:- 31 I-'. >J » W>. a ID u- to ID * 3" U- l~| 1) tJ- u- c 3H* *"'tototototoDTH 1 * QtortOinflJ'-' o 3 dr *5 S n III i/i Oi u 3 rt c to I/I 3 i-:- I ' Ji to * ' c to D ID uj 3 'n ID ID m uj n n * cLCLCLTiDctofD* f-s* *~- ' o h{ * < i/i in ID u- » rt * Ui » t_i i) » fD to to 3 3 * "D to "5 * 2i - in "D to o o *j w u- to c * s "D * in to ID in 3 2 rt U-v *"£ U-: rt » ** |p 5" » ^ 6, n V o ID k-> n n ID » to » to '43 tj » n c tod in 3" 3" l/l to to i/l * to~t}IDO"Oto u''* 303 X JU w 5 w- *n '0 < in o uj to ^ to or rt u>. n D1 *0 » in < n * C "DOOnj* *"DViXto33* *~'3tort" o * Oi ID in » u>. c * c t*- *< ' *o ID *j ' ' -+i T to 1 ti'D C "5 uj-ij » T ^ T i/i »n » '0 D ~D CLIO rj\X2 3" I n - ^ » -i, *]5 i^ in £ rt to 5l( u- i~i w tr » «D X » «-. Q C 1-1 3Dtoto Ui-"D"D »3<-^j "|j U- W- Cr «- to f 3 c 1-1 -D "+1 to en in in »- c to * aa o to fj 3 i-:- l~j n » to rj 0 3 ID to rt rt < 0 ^ - to "Dti C^S T«n< 5 *j ** C rt it! to ID Hi C *J *< r- 3 to ID ID >D tort "ti'D Stoto C'D o rt ^ w 0 3 3 c ^ rt to s in rt c » % rt QL ti tO n ^2 Ht 2 to In m u to in to o * rn rt ID (D 3 to to 3 1^ rt *j n 55 'n ^ to cm r- ^ IT U to 3 Ul *D Ul o It JLl a in o D 3" D rt to u J2 u 2 ^ to a ID

/-N O - ro 25 (D I-* U*- ro 0s CT1 J> S O 3 ro ro ro ro ro ro W W f-H f.fl CT5 CT" '43 Q L" M- S si u* w 0"> fT- 0"> r.f1, si '4J & m w ro ro '-* ^ Lri C.H ro «- OS 03 03 03 OS03050303030303Q30303030303030303030503 3 rt' I-.! W r>j w W W S Q O*1 CT1 W W j> ro OD ro «- W U* to- sl sl sl sl sislslslsjslslslslslslslslslslslslslslsl OD OD ro ro '43 UD 03 cn si si Cf W 03 si si si si slsislslslslslslsjsjsjsjsislslslslslsjsj o !-d u- »- ro w (D (D fcnfc , I rt* X. .ml rr rr rt rr rr ro ro & 4> J> LI rt ' Density Per- Species or taxonomic category (No./m2 ) cent

* STftTJDN 9 - DRY SEftSON Ol ittocbaeta. spp. £6. 31 t Tel 1 ina. tawpaensi & 1 7. 54 t E.xooone. at 1 ant i ca i 7. 54 t Laeonerei s. cul ve*~i 1 7. 54 t Mar, el ona. pet t i boneae B. 77 t Metoponortbus. sp. B. 77 t Tel 1 ina. spp. B. 77 t Kal 1 iapseudes. sp. ft B. 77 t Copepoda. spp. B. 77 t Lei toscol opl os. sp. B. 77 t ftxi otbel 1 a* roucosa B. 77 t Gastropoda* sp. S. 77 t

* STATION J0 - DRY SEASON Thary.x. sp. £64.1. S0 £4 Pa>~asta>~te. t^iquerta £604. 9B ££ Pbascol i on- sp- 1 394. SB 1£ ftr-i ci dea. pb i 1 bi nae 535. 03 5 Acteoei na. canal icul at a 4£9, 77 4 Ca»~di tawera. flo^idar»a 385. 9£ 3 Lyonsia. byal ina- f loridana 350. B4 3 K i nbe^g on u pb i s-. s i won i 350. 84 3 Het erowast us. f i 1 i f orwi s 333. H9 3 Dl irjocbaeta. spp. ££8- 04 £ Myodocopa. spp. £10.50 £ Sr-amil i na. ovul i far-mi s 1 75. 4£ 1 Newatoda, spp. 1 75* 4£ i Capi tel la, capi tata 1 40. 33 ji Ce^i thi urn, wuscaruw 1 40. 33 i Nassar-i us. al bus 13J.56 l Tel 1 ina. taropaensis 1££. 79 1 Eteone. heteropoda 96.48 i Edotea. t^i 1 oba 76.93 i Barrjeria. rapax 70. 16 l Newest i na, sop* 70. 16 i P>^i onospi o. beterobranchi a fc.l. 39 1 Tel 1 ina. 1 i neat a 5£. 6£ t Scol ol epi s* t ex ana 5£. 6£ t E.xoDone. at 1 ant i ca 43.85 t Marginel la. apicina 43. 85 t CVepidula. waculosa 43.85 t Ampel isca. bolwesi 35. 08 t Mysel 1 a. pi ami 1 at a 35. 08 t Copepoda. spp. 35.08 t ftthenaria. spp. 35. 08 t Mel inna. maculata 35.08 t

61 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION 10 - DRY SEASON Cyathura. pol ita 35.08 t Liwnil us. polypherous 35. 0B t Sphaerosyl 1 i s. longicauda £&. 31 t Vaunthowsonia. sp. £6. 31 t Pect i nari a. ooul di i 2B. 31 t Spi ocbaetopterus. cost arum. oculatus 1 7. 54 t Bi val vi a. spp. 17.54 t Ens is. mi nor 1 7. 54 t Lei toscoloplos. foliosus 1 7. 54 t Haplocytberida. set i punctata 1 7. 54 t Cerapus. sp. A B. 77 t Anowal ocardia. auberiana 8.77 t Pi st a. era stata 8.77 t Nassari na. wani 1 a f era 8.77 t Melonoena. corona B. 77 t Lea toscoloplos. f raoi 1 is 8.77 t Glycinde. sol i tari a 8.77 t Glycera. awericana 8.77 t Laeonerei s. cul veri 8.77 t Awpithoe. longiwana 8.77 t .Xenant^ura. brevitelson 8.77 t Taphroroysi s. bowroani 8.77 t Seroel i dae. sp. B. 77 t Am phi uridae. sp. 8. 77 t A.x i otftel 1 a. mucosa 8.77 t

* STATION 11 - DRY SEASON Tel 1 ina. versicolor 1 66. 64 £3 Dispio. uncinata 1££. 79 17 Cycl aspi s. sp. B 87.71 1£ Metamysidopsi s. swi f t i 78.93 11 Magelona. pettiboneae 70. 16 10 Donax. vari abi 1 i s 5£. 6£ 7 Glycinde. sol it aria £6. 31 4 Newer t i na. spp. £6.31 4 Phyl 1 odoce. arenae 1 7. 54 £ Copepoda. spp. 1 7. 54 2 Brachyura. sp. B. 77 1 Cftone. aroericana B. 77 1 Tharyx. sp. 6.77 1 Armandi a. roacul at a B. 77 1 Eteone. heteropoda 8.77 1 Ol i vel la. floral ia 8.77 1 Mysidopsis. furca 8.77 1 Spisula. sol idi ssiroa 8.77 1

62 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-l - DRY SEASON Awygdal urn. papyri ui» Oj-. .i< Si C^O.Q ilk JC.C?O£k Grandidierel la. bonnieroides 9633. £3 10 Amphi ctei s. gunner i 7011, 04 7 Cyel aspi s. sp. A 6455. 49 7 Corophi urn. 1 oui si anuw 5077. 72 5 St rebl ospi o. bened i et i 1 955. 53 2 Polydora. websteri 1444.43 1 Cyathura. polita 1 033. 32 1 Edotea. tri 1 oba 4BS. B6 1 Gi tanopsi s. sp. 422. 21 t Mul ina. lateral is 311. 10 t Neanthes. sueei nea £66. 66 t Geukensi a. deroissa. granosi ssiroa £44. 44 t Neraert i na. spp. 177.77 t StvlC'Chus. sp. 166.66 t Eupl ana. graei 1 i s 144. 44 t Tel 1 i na. versa eol or 144.44 t Nemert a na. spp. 122.22 t Ch i ronorai dae. spp. 77. 77 t Pol yroesoda. earol i ni ana 77.77 t Capi tel 1 a. capi tata 66.66 t Myti lopsis. leueophaeta 33. 33 t Neopanope. t ex ana. t ex ana 33. 33 t Nematoda. spp. 33. 33 t Hydroidea. sp. 22. 22 t Cooperel 3 a. at 1 ant i ca 22. 22 t Nudi branehia. spp. 22.22 t Grapsi dae. sp. 22. 22 t Copepoda. spp. 11.11 t Glyeinde. sol it aria 11.11 t Dl i gochaet a. spp. 11.11 t Bowwani el 1 a. brasi 1 i ensi s 11. 11 t Apanthura. cf, si gnat a 11. 11 t Gastropoda, sp. 11.11 t Waeowa. const ri eta 11.11 t Awpe3 i sea. abdi t a 11. 11 t

* STATION S-£ - DRY SEASON Curoe3 3 a. sp. A 29BB. 59 4£ Pect inaria- gouldi i 764. 36 11 Parapri onospi o. pi nnat a 711.04 10 Parasterope. po3 lex 373- 29 5 Aroygdal ura. papyri uro 346. 63 5 Aw pel a sea. abdi ta 337. 74 5 Leucon. sp. 30£. 1 9 4 Ox y ur os t y 3 i s. &M it hi 1 B6. 64 3

63 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-2 - BRY SEASON Neantbes. succi nea 1 53. 3B 2 Med i owast us. awbi seta 1 1 5. 54 2 Copepoda. spp. 37. 7B 1 Act eon* punctostriat us B2.21 1 Axiocnatftus. sou a/flat a 53. 32 1 Grandidierel la. bonnieroides 53. 32 1 Styl ocbus. sp. 53. 32 1 Odostowi a. sp. 44.44 1 Tttaryx. sp. 44.44 1 Mysel la. pi anulata 44.44 1 Glyci nde. sol atari a 35. 55 t Newer t i na. spp. £&. BB t Mul i na. 1 at era 1 i s 2B.BB t Doyri des. al pbaerostri s 2B- BB t Glycera. awericana £6. BB t Coropbi uw. 1 oui si anum 1 7. 77 t Ampel i sea. vadoruro 17.77 t Monocul odes, nyei 17.77 t Ampel i sea. holmes i B. BB t Cyatbura. polita B. BS t Paracaprel 1 a. tenui B B. SB t Spiocbaetopterus. cost arum, oculatus B. BS t Capi tel 1 a. jonesi B. BB t Streblospio. benedicti B. BS t Apantbura. cf . si gnat a B. SB t Ol i oocbaet a. spp. S. BS t Pbyl 1 odoce. arenae a. ss t Port uni dae. sp. B. SS t Pinnixa. pearsei B. BB t Cbone. awericana B. BB t

* STATION S-3 - DRY SEASON Cumel la. sp. A 1 342&. BS B2 Leucon. sp. A 5457. 23 £5 D.xyurostyl i s. sroi thi &B4. 37 3 Parapri onospi o. pi nnata £>(?i4. 3B 3 Gl yci nde. sol i tari a 1 53. SB 1 Sioawbra. bassi 151.03 1 Ampe 1 i sea . a bd i t a 151.03 1 Pect inaria. ooul di i 1 1 5. 54 1 Odostomi a. sp. B2f 21 t Odostowia. bisut ural is B2. 21 t Paracaprel 1 a. tenui s B2.21 t Neantbes. succi nea B2. 21 t Pinnixa. pearsei 53. 32 t Parasterooe. ool lex 53. 32 t

64 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-3 - DRY SEASON Mi nuspi o. sp. B 44.44 t Anci strosyl 1 i s. jonesi 44.44 t Aroycdal uw. papyri urn 35. 55 t Eri cthoni us. brasi 1 i ensi s 35. 55 t Newer t i na. spp. 35. 55 t Monocul odes, nyei £6.66 t Aropel i sea. ttolroesi 2B.BB t Act eon. punct ost r i at us ZB.BB t Medi oroast us. arobi seta 2B.BB t Port uni dae, sp. 17.77 t Aropel i sea. vadoruw 17.77 t Edotea. tri loba 17.77 t Medi oroast us. sp. 1 7. 77 t Sthenelais. sp. A 17.77 t Mysi dopsi s. bi gel owi B.BB t A.xio£natbus. squaroata B.BB t Macoroa. tent a B.BB t Enteropneusta. sp. B.BB t Axiognatftus. squaroata B.BB t Mysel la. planulata B.BB t Leptochela. serratorbita B.BB t Fabri ci a. sabel 1 a B.BB t Sayel 1 a. f usca B.BB t Arophi phol i s, sp. B. BB t Cbone, aroericana B.BB t Mysi dopsi s. furca B.BB t

* STATION S-4 - DRY SEASON Curoel la. sp, A 1 1 46. 55 17 Pect i naria, goul di i 11 36. 77 17 Ox y u r os t y 1 i s. sro i t ft i 791,03 i£ Awjycjdal uro, papyri uro 737,70 11 Parasterope. pol 1 ex 577, 7£ 9 Apoprionospi o. pygroaea 533, £8 B Abra. aeq ua 1 i s 373, £9 B Mysel la, pi anulata 1 95, 53 3 Aropel i sea, holroesi 1 Bb, 64 3 Tel 1 i na. versi col or 1 1 5. 54 £' Sthenel ai s. sp. A 97.76 1 Eri cthoni us. brasa 1 a ensi s £>£. £1 1 Acuroinodeutopus. naclei 6£.£1 1 Acteoci na. canal i cul at a 53. 3j£ 1 Wol Dili i dae. sp. 44. 44 1 Parapri onospi o. pi nnat a 44.44 1 Act eon. punct ost ri at us 35. 55 1 Spiophanes. borobyx 35. 55 1

65 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-4 - DRY SEASON Macowa. tent a 35. 55 1 Edotea. tri 2 oba 35. 55 1 63 yea nde. sol a tar a a 35. 55 1 Monocui odes, nyea 35. 55 1 Stylocttus. so. £6. BB t Awpel a sea. abdita ZB.BB t Glottidia. pyrawidata £6.66 t Grapsidae. so. £6. 66 t Newer t a na. spp. £6.66 t Odostowia. bisuturaj1 as £6.66 t Bi val via. spp. 17.77 t ftnachis. obesa 17.77 t Harrjeria. rapax 17.77 t Neanthes. succanea 17.77 t Lucina. so. B. BB t Ma t re 2 3 a. J1 unata B.BB t Pseudonalosydna. so. ft 8. BB t Mu 2 ana. lateral as B. BB t Osteacntftyes. spp. B. BB t Gastropoda. sp. B. BB t Mysidopsi s. bacelowa B. BB t Lyonsia. hya3 ana. f^oridana B. SB t Phy 1 1 odoce. arenae B. BB t Listraei 3 a. cf . barnardi B. BB t GJi ycera. sp. B. BB t Copepoda. sop. B. BB t

* STATION S-5 - DRY SEASON ftpoprionospao. pygmaea £4B. 86 14 Echinoidea. sp. 1 95. 53 11 Tel 1 a na. versa col or 1 51 . 09 9 Cyathura. po2 a ta 79. 99 5 Newer t a na. sop. 71. Itf 4 er -3- > " Hapiocytherada. setipunctata »_O. iZ 3 Eractf)ona us. brasa 1 iensas 53. 3£ 3 Dweni a. f us a f orwi s 53. 3£ 3 Spaophanes. borobyx 44. 44 3 AmpeJt a sea. boi'wesi 44. 44 3 Gatanop&is. sp. 44.44 3 Eudevenopus. honduranus 44. 44 3 Mysa dopsi s. bi gel owa 44. 44 3 Edotea. tri 3 oba 35. 55 d Copepoda. spp. 35. 55 £ Branch a osto/oa. caribaeujw 35. 55 £ Glottadi a. pyrawadata 35. 55 £ Cyci aspa s. sp. B 35. 55 £

66 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-5 - DRY SEASON Acar/tbobaustorius, mi 1 Isi £6,66 £ Oxyurost y 1 i s, siwi tbi £6, 66 £ Mysel la, pi ami 1 at a £6,66 £ Polydora, social is £6,66 £ Newer t i r*a, spp. £6,66 £ Acuiwi joodeutopus, joarjl ei 17,77 1 Curoel la, sp, A 17,77 1 Ti rorc, tropaki s 17,77 1 Syrcchel i di urn, cf , aroeri camiro 17,77 1 Lej/ibos, spi rci carpus, i joerroi s 17,77 1 Listriel la, cf, barnardi 17,77 1 Gastropoda, sp. 8,88 1 Cerapus, sp, A 8,88 1 Aricidea, pba Ibijoae 8,88 1 Pbyl 1 odoce, arenae 8,88 1 Pa raster ope, pol 1 e.x 8,88 1 Loiwi a, medusa 8,88 1 Paguridae, sp. 8,88 1 Parawetopel 1 a, cypri s 8,88 1 Lucir»a, sp. 8,88 1 Gl yci ftde, sol i tari a 8,88 1 Morjoculodes, rcyei 8,88 1 Phoroni s, arcbi tecta 8,88 1 My si dopsi s, iwortensena 8,88 1 Nassari us, vi bex 8,88 1 Mi mispi o, sp, B 8,88 .1 Mi trel la, 1 unata 8,88 1 Nematoda, spp. 8,88 1 Paracaprel 1 a, temii s 8,88 1 Nat i ca, pusi 1 1 a 8,88 1 Ti ron, tri ocel 1 at us 8,88 1 Myodocopa, spp. 8,88 1

* STATION S-6 - DRY SEASON Medi oiflast us, arobi seta 1 5£8, 73 31 Haplocytberida, seti punctata 433, 51 9 Apoprionospi o, pyomaea 319,96 6 Tel 1 i r»a, versi col or 30£, 1 9 6 Nucula, proxima £39, 97 5 Cbaeto^rone, sp. 1 68, 87 3 Solemya, occidental is 1 59, 98 3 Kinbercomipbis, siwoni 1 33, 3£ 3 Ampel i sea, bo 1 roes i 1 06, 65 £ Turboni 1 la, interrupt a 1 06, 65 £ Kal 1 i apseudes, sp, A 88,88 £ Nuculana, acuta 79, 99 £

67 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-6 - DJRY SEASON Copepoda. spp. 71. 10 1 Newer t i r*a. spp. 71. 10 1 Thary.x. sp. 62.21 1 Ari ci dea. pbi 1 bi r*ae 53. 32 1 Myodocopa, spp- 53. 32 1 O3 a ve 3 3 a, pusi I 3 a 53. 32 1 Newatoda, spp. 53. 32 1 Parasterope. pol 3 ex 53. 32 1 Phascol i or/, sp. 53. 32 1 Ari ca dea. fragi las 44.44 1 Mysi dopsi s. bi gel owi 44. 44 1 Abra. aequaa* a s 35. 55 1 Notowast u&* latericeus 35. 55 1 Lea toscoJ opl os. frag a las 26. BB 1 Da pi odont a. pur/ct at a 26.66 1 Ddost owaa* sp* 26. b6 1 Lucina* radi an& 26.66 1 O.xyurostyl is. smatha 26.66 1 Vaur>tf)om£c«r^aa. sp. 26.66 1 Awpharet a dae. spp. 17.77 t Dent al a UTO. te.xasa anuw 1 7. 77 t Axaothel I a. wucosa 17.77 t Luca f er. f a.xc«r*a 17.77 t Armandaa. macul at a 17.77 t Cyatrtura. pol i ta 1 7. 77 t Lei toscciJ opl os. f ol a osus 17.77 t Carazziel 1 a. hob&onae 1 7. 77 t Glycinde. sol it aria 17.77 t Luca na. sp. 17. 77 t Pori f era. spp. 17.77 t Spiopttarces. bowby.x 17.77 t Hydros oa. sp. B. BB t Caul I era el 1 a. sp. B. SB t Synchel i di uw>. cf . aweri canuw B. BS t Spiochaetopterus. costaruwi. oculatus B. SB t Mercenar i a. cawpechi er»si s B. BS t Phy 1 1 odoce. arer/ae B, SB t Lyonsia. hya.l i na. f loridana S. BS t Sabel 1 i dae, sp. B. SB t Mega 3 owwa. bi ocul at a S. BS t Paraprionospi o. pirmata B. SB t Wacowa. tent a B. SB t Pect ir/ari a. gouldi i B. SB t Mag el ona. pet t a bor/eae B. BS t Turboni 1 I a. dal 1 i B, SS t Lucina. nassul a B, BS t Dosi r>i a, di scus B. SB t

68 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-6 - DRY SEASON Sphaerosyl 1 i s* tayl ori &*B& t Mi nuspi o* sp* B a*&a t Listriella* cf* barnardi a* as t Pinnixa* pearsei a*aa t Monoculodes* nyei a*aa t Eri cthorii us* brasi 1 i en&i & a*aa t Nat i ca* pusi 1 1 a a*aa t Ph or on is* architect a a*aa t Microphol is* graci 11 iwa a*aa t Ol i gochaeta* spp* a*aa t

* STATION S-7 - DRY SEASON Fabri ci a. sabel 1 a 52J54*7a 75 Chone* amer i cana £275* 3£ 3 &oni adi des* carol i nae l£70*9a £ Coroph i UM, 1 ou i si arium 1 1 d£* 1 & £ Tiron* triocel latus 1 1 &£* 1 1 £ A.x i othel 1 a* jnucosa 719.92 J Eri cthoni us. bra&i 1 i ensi s 7C«£r*15 1 Crassiriel la* lunulata 634* 37 1 Ex oo one* di spar 5a&* 60 1 Act eon* punctostriatus 533* SB 1 Nematoda* spp* 479* 95 1 Vaunthomsonia* sp* 391*07 1 Microdeutopus* sp* 3d£* 1 a 1 Eulal ia* sanguinea 373* £9 J Medi omast us* sp* 373* £9 1 Kal 1 i apseudes* sp* A 355* 5£ 1 Wicroprotopus* raneyi 323* 85 t Ol igochaeta* spp* 31J*0a t Phyl 1 odoce* arenae £93, 30 t Lembos* uni corni & £75* 5£ t Nemert i na* spp* £57* 75 t Phot i s* jnel ani cus £43* a& t Aricidea* sp* C £4ti* d& t Acuini nodeutopus* nag lei £43* BB t Anadara* transverse £43* BB t Ki nbergonuphi s* si woni £3a * 0a t Aropi thoe* 1 one; i roana £04* 4£ t Myodocopa* spp* 1 BB. 64 t Munna* cf * hayesi 177*76 t Phot is* sp* 1 59* 9a t Lioberus* ca&taneus 1 51 * 09 t Abra* aequal is J£4* 43 t Lucifer* faxoni 1 1 5* 54 t Isol da* pul chel 1 a 97*76 t

69 Density Per- Species or taxonomic category (No . /m2 ) cent

* STATION S-7 - DRY SEASON Pbyl lodoce, castanea SB, SB t Lyonsia, by a I ina, f loridana 88, SS t Glycera, americana SB, SB t Awygdal urn. papyri urn SS, SS t Lucina, sp. 79, 99 t Gi tanopsi s, sp. 71, 1® t Moloul idae, sp. 71, 1» t Podarke, obscura 71, 1® t Copepoda, spp. 53, 3£ t Spi o, pet t i boneae 53, 3£ t Spbaerosyl 1 i s, sp. 53, 3£ t Pol yci rr us. sp. 53, 3£ t Cycl aspi s, sp, B 53, 3£ t Aroaeana, tri lobata 53, 3£ t Cunoella, sp, A 44,44 t Stbenelais, sp, A 44,44 t Moor eon upb i s. sp, A 44,44 t Cardi i dae, sp. 44,44 t Spiopbanes. bow by* 44,44 t Anacbis, obesa 35, 55 t Cbaet ozone, sp. 35, 55 t Apoprionospio, pygwiaea 35, 55 t Lei toscoloplos, f ol iosus 35.55 t Cyatbura, polita 35, 55 t Heroipbolis, elonoata 35,55 t Pbascol ion, sp. 35, 55 t Crepidula, pi ana 35, 55 t Diplodonta, punctata £6,66 t Glottidia, pyraroidata £6,66 t Paguridae, sp. £6,66 t Spi ocbaetopterus, cost arum, ocul at us £6,66 t Corbula. contracta £6,66 t Euceramus. praelongus £6.66 t Macowa. tent a £6.66 t Grandidierel la, bonnieroides £6.66 t Aropel isca, abdi ta 17.77 t A.xiognatbus. squamata 17.77 t Hydrozoa, sp. 17,77 t Cyroadusa, cowpta 17,77 t Hydroidea, sp. 17,77 t Tagel us. di vi sus 17,77 t Paleanotus, beteroseta 17,77 t Tiron. tropakis 17,77 t Styl ocbus. sp. 17,77 t Pararopb i nome. sp, B 17.77 t Awpharet i dae. spp. 17,77 t Eudevenopus, bonduranus 17,77 t

70 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-7 - DRY SEASON Asthenotnaerus. ftemi pr»i 1 1 a 17.77 t Pol yd or a. soci al i s 17.77 t Odostomi a. sp. 17.77 t Dxyurostylis. siwithi 17.77 t Semel e. bel 1 astri at a 17.77 t Brancbiostowa. sp. 17.77 t Spttaerosyl 1 i s. tayl ori 17.77 t Pol ygordi us. sp» a. aa t Pasta. cf . quadra lobata a. aa t Terebel 1 i dae. sp. a. as t Aonides. mayaguezensi s a. aa t Xantbidae. sp. a. aa t Holothuroidea. sp. a. aa t Mysi dopsi s. iwortenseni a. aa t Phol oe. sp. a. aa t Brachiopoda. sp. a. aa t Caecum. strigosuw a, aa t Paranaitis. polynoides a. aa t Ci rropnorus. lyra a. aa t Portunus. gibbesi i a. aa t Calyptraea. central is a. aa t Pagurus. carol inensis a. aa t Monocu lodes, nyei a. aa t Glyceiweris. pectinata a. aa t Dent at i syl 1 i s. carol i nae a. aa t Pectinaria. aouldi i a. aa t Caul leriel la. sp. a. aa t Nat i ca. pusi 1 1 a a. aa t Cr epi d u 1 a. macu 1 osa a. aa t Musculus. lateral is a. aa t Echinoidea. sp. a. aa t Pseudohalosydna. sp. a. aa t Epi toni ui». sp. a. aa t Parasterope. pol 1 ex a. aa t Leu con. sp. A a. aa t Scol opl os. sp. a. aa t Mysi dopsi s. bi oel owi a. aa t Tharyx. sp. a. aa t Wi nuspi o. sp. B a. aa t Paraprionospio. pinnata a. aa t Brani a. cl avata a. aa t Gastropoda, sp. a. aa t Cerapus. sp. A a. aa t Nephtys. sirooni. (?) a. aa t Si puncul a, spp. a. aa t Athenaria. spp. a. aa t Oweni a. f usi f orroi s a. aa t

71 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-7 - DRY SEASON Medicunastus. arobiseta B. BS t Pandora, sp. 6. S8 t Parametopel1a, cypr i & B. BB t

* STATION S-6 - DRY SEASON Crassinel2 a. 2 umi 2 at a 782. 1 4 1£ Eup2 ana* oraci 2 i & 70£. 1 5 11 Podarke. obscura B22. 1 B 10 Copepoda. spp. 453. SB 7 Dosi rii a. d i ecus 444. 40 7 Parapionosy2 2 is* 2or*gicirrata 346. 63 5 Polyoord i us. sp. 319.96 5 Heroa podus. roseus £84. 41 4 Olioochaeta. spp. £31. 0B 4 Paramphi nome. so. B £££. £0 3 Metharpi ma. f1ori danus 1 95. 53 3 Branchi ostoroa. card baeuw 1 59. 98 £ Arophiuridae. &p. 151.09 £ Eurydice.2 i ttora2 is 151.09 £ Luci fer.faxoni 97.76 1 Typosy2 2 i s. sp. 79.99 1 Caecum, sp. 71. 10 1 Sphaerosy2 2 i s. tay2 ori 6£. 21 1 Anadara. transverse 53. 3£ 1 Newer t i na. spp. 53. 3£r 1 Nat i ca. pusi11 a 44.44 1 Caul 2erie2 2 a. sp. 35. 55 1 Athenari a. spp. 35. 55 1 Mega2 uropus. sp. 35. 55 1 Eri cthoni us. brasi 2 i ensi s 35. 55 1 Eulal ia. sariouinea 35. 55 1 Seroele.nuculoides £6.66 t Phot i s.welanicus £6. 66 t Portunidae.sp. £6.66 t Platyhelminthes. spp. £6. 66 t Terebel1i dae.sp. £6. 66 t Polyplacophora. spp. £6.66 t Tanaidacea.spp. £6.66 t Unci ola. serrata £6.66 t Wyodocopa. spp. £6. 66 t Wi tre2 la. sp. £6. 66 t Aropi thoe. 1ong i mana £6.66 t Brachyura. sp. 17.77 t Curoel la. sp. A 17.77 t Grapsi dae. sp. 17.77 t Brani a.clavata 17.77 t

72 Density Per- Species or taxonomic category (No . /m2 ) cent

* STATION S-B - DRY SEASON Arophiodia. pulchel la 17.77 t Axi othel 1 a. wucosa 17.77 t Bi val vi a. spp. 17.77 t Aroygdal ui». papyri urn 17.77 t Haplocytberida. set ipunctata 17.77 t Monocu lodes, nyei 17.77 t Stylochus. sp. 17.77 t Spbaerosy 1 Us., sp. 17.77 t Sewi balanus. balanoides 17.77 t Tbaryx. sp. 17.77 t Arabel 2 a. i r i col or B. 80 t Asci d i acea. sp. fl. SB t Acr-oci rr-us. f r-owt i f i 1 i s B. BB t Ba Janus. iwprovisus B. Bfl t Achel ia» spinosa B. BB t Gor»i ad i dee. carol i r»ae B. BB t Hydrozoa. sp. B. BB t Eryci na. emmorjBi B. BB t Ehlereia. cornuta B. Bfl t Cycl aspi &, s»p. B B. BB t Cyathura. pol i ta B. BB t Exogone. dispar B. BB t Fabri ci a. &abel 1 a B. BB t Leptosynapta. sp. B. BB t Eroerita. portoricewsis B. Bfl t Nematoda. spp* B. BB t Spieula. eolidiseima B. Bfl t Lei t oecol opl os. frag i 1 i s fl. flB t Paguridae. sp. B. flfl t Eunice, webs t era fl. flfl t Sty loch us. sp. fl. Sfl t Wel li ta. quinqueieperforta fl. flfl t Tiron. tropakis B. flfl t Liii0ulu&. poly phew us fl. Bfl t VaunthowsE-oni a. sp. B. BB t Pal eanotus. heteroseta fl. flfl t Lemboe. epini carpus, inermis B. flfl t Gi tanopsi s. ep. fl. flfl t Lenobos. unicornis fl. flfl t Ddontosyl 1 i s. enopl a fl. flfl t Para»terope. pol lex fl. flfl t

* STATION S-9 - DRY SEASON Medicuaastus. awbiseta fl71.8£ IS Ol igochaeta. spp. 435.51 & Copepoda. spp. 417.73 6

73 Density Per- Species or taxonomic category (No . /m2 ) cent

* STATION S-9 - DRY SEASON Balamis, iroprovis.ua 373. £9 5 Tel 1 i na. versa col or 3A&. &3 5 Abra. aequal is. £48. BB 3 Macoma. tent a £4B. BB 3 Newer tir*a. spp. £39. 97 3 Newatoda. spp. £J3. 31 3 Parasterope. pol lex £13.31 3 Turboni 1 3 a. conrada £04. 4£ 3 Ol i vel 1 a. pus. a 1 1 a 1 S&. 64 3 Anadara. transverse 168.87 £ Strebl osoroa. hartmanae 151.09 £ Stenopl eustes, of. graca 3 i s 1 33. 3£ £ Acteocana. canal iculata 115. 54 £ Era cthona" us., braei 1 i ensi s 115. 54 £ Pri onospi o. heterobrancha a 115.54 £ My sea la. planulata 97.76 1 Soleroya. Occident alas 97.76 1 Ampelisca. abdita 79.99 1 Capi tel la. capitata 79.99 1 My si dopsi s. bah a a 79.99 1 Parapri onospi o.. pannata 79.99 1 Glycinde, soli tar i a 6£.£1 1 Coroph a um. 1 ou i si anuw 6£.£1 1 Exocjone. da spar &£.£! 1 Wysi dopsi s, bi gel owi 6£.£1 1 Dxyuros-tyl is. swithi 6£.£1 1 SpiocMaetopterus. cost arum, ecu 1 at us. 6£.£1 1 Geukensia, dewassa, granosissiwa 53. 3£ 1 Branulana. ovul a forwas 53. 3£ 1 Spa ophanes, bowbyx 53. 3£ 1 Aropni uridae. sp. 44.44 1 Lea toscol opl oe, f ol a osus 44.44 1 Ma croprotopus. raney a 44.44 1 Neanthes. acumanata 44.44 1 Phyl lodoce. arenae 44.44 1 Synchel a d a uw. cf . amer a canum 44.44 1 Tharyx, sp- 44.44 1 Ampel a sea. hoi mesa 35.55 t Wyodocopa. spp- 35. 55 t Phyl 1 odoce. cast anea 35.55 t Thenar a a, spp* 35.55 t Cerapus. sp- A £6.66 t Caul lerael la. sp. £6.66 t Chaone. cancel lata £6.66 t Chone* aroeracana £6.66 t Caprel 1 a. penant a s £6. 66 t Amp it hoe, longimana £6. 66 t

74 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S~9 - DRY SEASON Ana eft i s, obesa Z&.&& t Ka 1 1 i apse tides* sp- A £&. >& t Ddostoroia- products £6,66 t Myri ocbel e- ocu3 at a £&-&& t Lyonsia-hyal ina- florid ana £6-66 t Pect i nari a. goul di i £6.66 t Marginal Is. apicina 17-77 t Sco3 opl os, rubra 17.77 t Atbenari a. spp- 17-77 t Lucina- sp- 17-77 t Haroi noea- succi nea 17-77 t Hargeria- rapax 17-77 t Cardi i dae« sp. 17-77 t Odostcunia* sejooinuda 17-77 t Goul di a, cer i na 17-77 t HapJocythe^ida, setipunctata 17-77 t Hydr*oidea, sp. 17-77 t NucuJa, proxiwa 17-77 t Capi tel 1 a, jonesi 17-77 t Odontosy J Us-, enopl a B-BB t Cumel la, sp, A B-BB t Po J ydora, soci a 3 i s B-BB t Sty 2 ochus, sp. B- BE t Co 3 uwbeJ J a, rust i coi des B-BB t Con us. jaspideus, steamsi B- BE t Ddostojwi a, sp. B-BS t Cirrophorus. lyra a-B& t Ar-i ci dea. ph i 1 bi r*ae B-BB t Ax i othel 1 a, mucosa B-BB t Wetharpir^ia. f Joridanus B-B8 t Pol ynoi dae. sp. a-Ba t Chaet ozone- sp. B-BS t Sphaerosyl lis- taylori a-Ba t D&teichthyes, spp. &-BB t Apoprionospio- pyomaea a-Ba t Stenothoe« cf . mi nut a B-BS t Batea- cathari nensi s a-Ba t Wuscu 1 us- 1 at era 1 i s B-BB t Luwbrineri s, verri 1 1 i a-Ba t Asthenothaerus, hemi phi J 1 i B-BB t Nat i ca. pusi 1 1 a a-Ba t Fabr i ci a, sabel 1 a B-BB t Pftascol i on- sp- a-BB t EupJ ana- graci 1 i s &-BB t Pi rcuai s- robert i a-Ba t Edotea- tr i 1 oba B-BB t Nassari us- vi bex &-BB t

75 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-9 - DRY SEASON Gastropoda, sp. 8,88 t Lastrael la. cf, barnarda 8,88 t Erachsonel la, cf, attenuata 8,88 t Tagel us, pi eba us 8,88 t Gitanopsas, sp. 8,88 t Tel 1 ana, squama f era 8,88 t Hydroades- daanthus 8,88 t Happolyte, pleuracanthus 8, 88 t Eulal a a, sanouanea 8,88 t Raeta, pi a cat el la 8,88 t Epa tona UBJ, nautl ae 8,88 t Sphaerosyl 1 as, longacauda 8,88 t

* STATION S-i® - DRY SEASON Ajnpel a sea, hoi mesa 11&2.11 £0 Parasterope,pol1ex 749,9£ 13 Medaomastus, ambaseta 631,04 11 Lastraella, cf, barnarda 444,40 8 Eracthonaus, brasa 1 aensis 435,51 8 Qxyurostylas, sroatha £13,31 4 Cui»ella,sp, A 195,53 4 Glycande, sol a taraa 177,76 3 Megaluropus, sp, 14£,£0 3 Acteocana, canal aculata 115,54 2 Ampelasca, abdata 97,76 & Axoygdal uw, papyri urn 71,10 1 Neroertana, spp, 71,10 1 Balanus, amprovasus 6£,£1 1 Neanthes, succanea 6£,£1 1 Coropha uro, louasaanujn 53,3£ 1 Wysella, planulata 53,32 1 Sayella, fusca 53, 32 1 Turbona11 a, conrada 44,44 1 Kanbergonuphas, samona 44,44 1 Spaochaetopterus, costarun), oculatus 44,44 1 Mysadopsas, f urea 44-44 1 Cyroadusa, coropta 44,44 1 Mysadopsas, bah a a 44,44 1 Hajnanoea, succanea 44,44 i Neroatoda, spp, 35,55 1 Wul ana- lateral as 35,55 1 Parapra onospa o, pa nnata £r6, 66 t Paracaprella, tenuas 17.77 t Granda da erel1a, bonna eroa des 17,77 t Athenara a, spp, 17,77 t Edotea, traloba 17,77 t

76 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-10 - DJRY SEASON Ol i gochaeta, spp. 17,77 t Gastropoda* sp. 17,77 t Macoma, tent a 17,77 t Capitel la* capitata 17,77 t Bowroani el 1 a. brasi 1 i ensi s 17,77 t Tel 1 i na, versa col or 17,77 t Mel i nna, roacul ata 8.88 t Apoprionospio, pygxoaea S, 60 t Leitoscoloplos, fragilis B, 08 t Laevicardi uro, wortoni 0,00 t Gitanopsis, sp. 0,00 t Hargeri a* rapax 0,00 t Armandi a, jnacul ata 0,00 t Ar i ci dea, ph i 1 bi nae 0,00 t Acuwi nodeutopus. nag 1 ei 8,08 t Ph or on is, architect a 8,00 t Di astoroa. vari um 0,00 t Copepoda, spp. 0,00 t Haplocytherida, setipunctata 0,00 t Ens is* minor 0,00 t Phascol ion. sp» 0,00 t Odostcunia* sp» 0,00 t Ophiophragmus, sp» 8,88 t Crepidula, sp« 0,00 t Pol ydora, websteri 0,88 t Pi nni xa- pearsei 8,88 t Eteone* heteropoda 8,88 t Caecum, pulchel 1 urn 8,88 t Thenari a, spp. 8,88 t Mitrella, lunata 8,68 t Turridae, sp. 0,00 t Paracerceis, caudata 0,00 t Odostomia, bisutural is 0,00 t Erichsonella, cf, attenuata 0,88 t Lucina, sp. 8,80 t Oweni a, f usi f oriwi s 6,68 t

* STATION S-J1 - DJRY SEASON Spi rorbi s, corrugat us 4186,24 41 Er i cthoni us, brasi 1 i ensi s 639, 93 B Newatoda, spp. 595, 49 B Ol igochaeta, spp. 337, 74 3 Ampithoe, longixoana £75, 52 3 Coroph i UM, 1 ou i s i anuro £04, 4£ S Ar i ci dea, ph i 1 bi nae 1 95, 53 S Mediomastus, ambiseta 1 86, 64 S

77 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-ll - DRY SEASON Pol ydora. soci a 1 i s i 4£. £0 1 Tel 1 i na. versa col or 1 1 5, 54 1 Caprel la, penant i & i 1 5, 54 1 Hi nbergonuphi s. si won i 1 1 5. 54 1 Mediomastus. &p. 1 i 5, 54 1 Acteocina. canal iculata 115. 54 1 Balanus. ampfti trite, aropfti trite 97.76 1 Elasmopus, levis 97.76 1 Odontosy 1 lie* enopl a 97.76 1 Anadara. transversa as. as 1 Cerapus, sp. A as. as 1 Ol i vel 1 a* pusi 1 1 a as. as 1 Luconacia. incerta SB. a& 1 Tbaryx. sp. 79.99 1 Nudi branchi a. spp. 79. 99 1 Margi nel 1 a, api ci na 79.99 1 Nemert i na« spp* 73. 99 1 Abra- aequal is 71. 10 1 Exogorje, dispar 71. 10 1 Microprotopus, raneyi 71.10 1 Turboni 1 la* conradi 6£.£1 1 Lei toscol opl os» f ol i OB us &£.£! 1 Stenopl eustes* cf . graci 1 i & &£.£! 1 Terebel 1 idae. sp* &£.£! 1 Thenari a* spp~ 6£.£1 1 Ari ci dea- tayl ori 53. 32 1 Cft i one, cancel lata 53. 3£ 1 Oxyurostyl is* siwi thi 53. 3£ 1 Ax i othel 1 a, mucosa 44.44 t Ampel i sea, abdi ta 44.44 t Granul ina, ovul iforwis 44.44 t Cyathura, pol i ta 44.44 t Hippolyte, pleuracanthus 44.44 t Paracaprel 1 a. tenui s 44.44 t Balanus, improvisus 3S. 55 t Crassi nel 1 a, 1 unul ata 35. 55 t Mysel 1 A. pi anul ata 35. 55 t Sphaerosy 1 1 i s. tayl ori 35.55 t Pr i onospi o» fteterobrancfti a 35.55 t Chone. awericana £6,66 t Bushi a, el egans £6.66 t Turboni 1 1 a, sp» F £6,66 t Sabel laria, vulgar is £6. 66 t Marginel la. aureocincta £6. 66 t Apopri onospi o, pygmaea £6. 66 t Cope pod a- spp. 17.77 t Ampel i sea* ftolmesi 17.77 t

78 Density Per- Species or taxonomic category (No,/m2 ) cent

* STATION S-ll - DRY SEASON Musculus. lateral is 17.77 t Bi val vi a, spp. 17.77 t Bryozoa. spp. 17.77 t Hargeria. rapax 17.77 t Lucina. sp. 17.77 t Gitanopsis. sp. 17.77 t Acuminodeutopus. nag lei 17.77 t Luci f er. f axoni 17.77 t Prosthio&towum. sp. 17.77 t Nuculana. acuta 17.77 t Mitrella. lunata 17.77 t Hydroi dea. sp. 17.77 t Fabri ci a- sabel 1 a 17.77 t Spiocbaetopterus. cost arum, oculatus 17.77 t Stenotftoe. cf« mi nut a 17.77 t Gnes-i oceros. sp~ 17.77 t Wyriochele. oculata 17.77 t Wed i owa st u s. ca 1 i f or n i ens i s 17.77 t Sayella. f usca 17.77 t Capitel la, capitata 17.77 t Paraprionospio. pinnata B.BB t Sthenel ai s. boa 8. SB t Nat i ca. pusi 1 1 a B,BB t Arwandia, juaculata B, SB t Gastropoda. sp. B. SB t Autol yt us. sp- A a. as t Crepidula. pi ana B. SB t Eupl ana. graci lie B. BB t Geukensi a. demi ssa. granosi ssima B. BB t Ol ivel la. sp. B. SB t Hanoi noea. succi nea B. BB t Mycidacea. sp. B, SB t Pagurus. brevi dactyl us B. BB t Amygdal uw. papyri urn B, SB t Atftenaria. spp. B. BB t Dent a 1 i urn. 1 aq ueat urn S, SB t Hydrozoa. sp. B. BB t Gl yci nde. sol i tar i a B. SB t Tiron. tropakis B. SB t Typosy 1 1 i s. sp. B S. SB t Para pi onosy 1 1 i s, sp. B. SB t Phyl 1 odoce. arenae S. SB t Nassari us. al bus B. BB t Turridae. sp. B. SB t Spiophanes, bombyx B. SB t Parasterope. poll ex S. SB t Macoroa. tent a B. BB t

79 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-ll - DRY SEASON Listriella. cf. barnardi B. 88 t Nucula. proxi/wa 8.88 t Melanella. sp. 8.88 t Monocu lodes, nyei 8.88 t Cumi rigid, tel 1 inoides 8.88 t Port uni dae, sp. 8.88 t

* STATION S-l£ ~ DRY SEASON Spiocbaetopterus. costaruro. oculatus 1ZB2. 09 19 Medi omast its, awba seta 844. 36 1£ Turboni 2 1 a. conradi B2£. 1 B 9 Parasterope. pol lex 559. 94 8 Neroatoda. spp. 551 . ®5 8 Medi oroast LIB. sp. 417.73 6 Glycinde. sol it aria 311.08 5 Hapl ocytheri da. set i punctata 1 4£. £0 £ Paraprionospio. pinr»ata 1 33. 3£ £ Tel 1 i na. versi col or 1 33. 3£ £ Listriel la. cf. barnardi 115.54 £ Cbaetozone- sp. 1 1 5. 54 £ Nemert i na- spp. 106.65 £ Acteocina. canal iculata 97.76 1 Kinbergonuphis. siwoni 88.88 1 Ol igochaeta. spp. 79.99 1 Am pel i sea. hoi mesa 79. 99 1 My s a dopsi s. bi gel owi 62. 21 1 Macoroa. tent a 62. £1 1 Apoprionospio. pygiwaea 53. 3£ 1 Lucifer. faxoni 53. 3£ 1 Oxyurostylis. siwithi 44.44 1 Odostomi a. sp. 44.44 1 Leitoscoloplos. foliosus 44,44 1 Copepoda. spp. 44.44 1 Cumella. sp. A 35.55 1 Polydora. social is 35.55 1 Asychis. elomjata 35.55 1 Medioroastus. cal i forniensis 35.55 1 Odostoroia. bisutural is 35.55 1 Carazz i el 1 a. hobsonae 35.55 1 Leitoscoloplos. fragil is £6.66 t Wysi dopsi s. furca £6.66 t Chaet ozone. setosa £6.66 t Atf>enari a. spp. £6.66 t Anachis. obesa £6.66 t Odostoini a. seminuda £6.66 t Ampel i sea. abdi ta £6.66 t

80 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-l£ - DRY SEASON Leitoscoloplos. sp. 2B.BB t PhyJt 1 odoce. arenae 47.77 t Turboni 1 la. interrupt a 17.77 t Abra. aeq ua 1 i s .17. 77 t Neantftes. acuminata 17.77 t Mi nuspi o. sp- B 17.77 t Stenopl eustes. cf . graci 1 i s 17.77 t Scol ol epi s. so uawat a 17.77 t Nuculana. acuta 17.77 t Astarte. sp. 8.88 t Capi tel 1 i dae. sp. 6.88 t Mercenaria. cawipechiensis 8.88 t Prtyl lodoce. castanea B. SB t Chone. a/ueri cana 8.88 t Nassari us. al bus B. SB t Grapsidae. sp. 8.88 t Scoloplos. rubra B.BB t Sthenel ai s. boa 8. B8 t Eulal ia. sanguinea B.BB t Mysel la. planulata 8. BB t Eri cthoni us. brasi 1 i ensi s B. 8B t Maldane. cf . sarsi 8. B8 t Luwibri neri s. sp. D B. B8 t Periclimenes. longicaudatus B. 8B t

* STATION S-J3 - DRY SEASON Awpel i sea. abdi ta 2B2Z. 1 9 15 Ajapel isca.holwesi £499. 97 15 Cerapus. sp. A £177.75 13 Parasterope. pol 1 ex 1211.09 7 Curoel la. sp. A 977. 76 6 Aricidea. philbinae 844. 43 5 Hargeri a. rapax 593. 99 3 Myodocopa* spp. 577. 77 3 Oxyurostyl is. swithi 477.77 3 Capi tel la. ca pi tat a 466, 66 3 Thary.x. sp. 4&&. 66 3 My s-el la. planulata 311. 10 £ Newer t i na. spp. £11.10 1 Medi or/last us. sp. £11. 10 1 Aroygdal urn, papyri urn £11.10 1 Caecum, pul chel 1 uw 1 99. 99 1 Medioroastus. arobiseta 199.99 1 Acteocina. canal iculata 1 55. 55 1 Acuroinodeutopus. nag lei 144.44 1 Grandidierella. bonnieroides 444^44 1

81 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-13 - DRY SEASON Nematoda. spp. 1 33. 33 i Hal 1 a apseudes. sp. J££. ££ i Qdostoroaa. bisut uralis 111.11 1 Paracercea s. caudata iil.il 1 Tel 1 i na. versa col or lil.ll 1 Scol opl os. r ubra 99. 99 i Abra. aequal is. 99. 99 1 Witrella. lunata B&.BB 1 Macoroa. tent a SB. BB 1 Ericbsonel la- cf. attenuata BB. BB 1 Ed o tea- tri loba 77.77 t Cirropborus. lyra DO. C«t> t Chor»e» americana 66.66 t Phyl 1 odoce. arenae 66.66 t JX enafttft ur a, brev i t el &or» 66. 66 t Megal uropus. sp- 66. 66 t Glyciride. sol it aria 66.66 t Ascidiacea, sp» 55. 55 t Coropni urn. 1 oui si amiw» 55. 55 t Haplocytherida, setipunctata 44.44 t Parapri ooospi o» pi rir»ata 44.44 t Lyo«sia» hyal ina, floridar»a 44.44 t Er i cthoni us- brasi 1 i er*si s 44.44 t. Paracaprel la- tenuis 33. 33 t Spiochaetopterus, cost arum, oculatus 33. 33 t Bowmani el 1 a, brasi 1 i ensi s 33. 33 t Fabricia, sabel la 33. 33 t Cymadusa, cornpta 33. 33 t Anadara, transversa ££. ££ t Muscul us, lateral is ££. ££ t Copepoda« spp. ££. ££ t Dl igochaeta- spp- ££. £2 t Mel anna. mac ul at a ££. £2 t Monoculodes. nyei ££. ££r t Tacel us. diva sus ££:.££ t Sayel 1 a. f usca ££. c^£ t Pttascol ion. sp. £ic". £2 t Act eon. punctostriatus £'£. ££ t Kinbercjonuptti s. simoni 11. 11 t Aricadea. taylori 11. 11 t Fabricia. sabel la 11. 11 t Amphicteas. gunneri 11. 11 t Odostoroia, iwpressa 11.11 t Hydrozoa. sp. 11.11 t Tr>enari a. spp. 11.11 t Luwbri nera s. sp. D 11. 11 t Pinnixa. pearsei 11.11 t

82 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-13 - DftY SEASON Diopat»~a. cuprea ii. li t Spheni a. ant ill ensi s li. ii t Mysidopsis, furca ii.ll t Tel 1 i na. ta/»paensi s 11. 11 t Ma Del ona. pet t i boneae 11. 11 t Nassari us. al bus il.ll t Gi tanopsi s. sp. 11. 11 t Metharpinia. floridanus 11. 11 t Balanus, iwprovisus 11. il t Polydora. sp. 11. 11 t Bi val via. spp. 11.11 t Granul ina. ovul i for-rois il. li t Isolda. pul chel 1 a li, 11 t Pa r a wet o pel la, cypris 11. il t Spiocttaetopterus, costaruw, oculatus 11,11 t

* STATION S-14 - DRY SEASON Wed i omast us. awbi set a 479. 95 9 Neoiatoda, spp. 4£S- fc£r 8 Med i cunast us. sp. 408. 84 7 Newest i na. spp. 3£B, BS 6 Tel 1 i na. ve*^si col or £39.97 4 Fabri ci a. sabel 1 a 1 59. SB 3 Cumel la. sp. ft j£4. 43 £ Kinbe^Donuphi s. sisflor*i 1 1 5. 54 £ Luci f er. f axoni 115. 54 H Ampel isca, Jiolmesi 97.76 2 E.xoQone» dispar 97. 76 £ Dl i gocr^aet a. spp. 97.76 £ Nuculana. acuta 97.76 £ Sphaerosyl 1 i s. tayl ori 97.76 £f 01 i vel 1 a. pusi 1 1 a 88-88 £ Oxyurosty 1 i s. swi thi SB, BS 2 Anadara. transversa 79.99 1 Cope pod a. spp. 79, 99 1 Sphaerosyl 1 is. longicauda 79. 99 1 Solemya, occidental i s 79. 99 1 Asci di acea. sp. 71. 10 1 Eri ctttoni us, brasi 1 i ensi s 71, 10 1 Diplodonta, punctata 71. 10 1 Myodocopa, spp. 71. 10 1 Turboni 1 1 a. conradi 71. 10 1 Acu«>inodeutopus. nag lei 6£. 21 1 Sthenelais. sp. (4 6£. £1 1 ftbra. aequal is 53. 3£ i Medic«wastus. cal i forniensis 53. 3j£f 1

83 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-14 - DRY SEASON Phascol i or*, sp. 53, 32 1 Tharyx, sp. 53, 3£ 1 Corbul a, contract a 44,44 1 Nucula, proxaroa 44,44 1 Luwbrineris, verri 1 1 i 44,44 1 Vaunthowsonia, sp. 44,44 1 &ri ci dea, phi 1 bi nae 35, 55 1 Pol yci rrus, sp. 35, 55 1 Glott idi a, pyrawidata 35, 55 1 MarDi nel 3 a, apicina 35, 55 1 Monoculodes, nyei 35, 55 1 Prosthi ostowuwj, sp. 35, 55 1 Capi tel 1 i dae. Genus, A 35, 55 1 Cirrophorus, 3yra £6, 66 t A.xi ot-hel la, mucosa 2B.BB t Caul leriel la, sp. £6,66 t Ampi thoe, 1 ong i mana £ 6,66 t Amygdal urn, papyri urn £6,66 t Mi croprotopus, raneyi £6,66 t Phot is, wel anicus £6,66 t Lucina, sp. £6,66 t Phyl 1 odoce, arenae £6,66 t Ti ron, tri ocel 1 at us £6,66 t Dweni a, f usi f ori»i s £6, 66 t Apopri onospi o, pygmaea 17,77 t Phoronis, architect a J7, 77 t Notomastus, latericeus 17,77 t Chaet ozone, so. 17,77 t Lei toscol opl os, f ol i osus 17,77 t Gl ycera, awer i cana 1 7, 77 t Chone, amen cana 1 7, 77 t Paraprionospio, pinnata 17,77 t Parasterope, pol le.x 17,77 t Podocerus, sp. 17,77 t Polydora, social is 17,77 t Pi romi s, robert i 1 7, 77 t Grand idi ere 1 la, bonnieroides 1 7, 77 t Crassinella, lunulata 17,77 t Myriochele, ocul at a 17,77 t Mi nuspi o, sp, B 17,77 t Macoroa, tent a 17,77 t Eucera/wus, praelongus 17,77 t Brani a, cl avata 1 7, 77 t Pinni.xa, pearsei 17,77 t Cryot urr i s. ceri nel 1 a B, BB t Port uni dae, sp. B, BB t Ehlersia, cor nut a B, BB t

84 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-J4 - DRY SEftSDAJ Ampharetidae. spp. B.&& t Dental i urn, 1 aqueat uw B.BB t ftpanthura. cf. signata B, aa t Haplocytberida, setipunctata 8.88 t Caprella. penantis a, aa t Si puncul a* spp* a, as t ftri ci dea. tayl ori a, aa t Neopanope. t ex ana. t ex ana a, &a t Semele, sp- a, as t Paguridae, sp* 8. 88 t Bom ad i de&. carol i nae a, aa t Mysi dop&i s- bahi a a. sa t Serol i &. rograyi a. aa t Pett i boned a. sp. A 8.88 t Coroph i urn. 1 ou i si an urn a, aa t Nudi branch i a, spp. a, as t Spiocnaetopterus. co&taruw. oculat us s, aa t Pol ycJl add da- sp» 8.88 t Mecal uropu&, &p. 8,88 t StheneJ a a s, sp- A 8,88 t Ter-ebel 2 i dae, sp- 8,88 t Hydr-ozoa. sp. 8.88 t Awphi uridae. &p. B. 88 t StenopJ eustes- cf » graci 3 i s 8.88 t Bu&ycon, contrari urn 8.88 t Margined "la- hartleyanum 8. SB t Glycinde. &ol it aria a, aa t Paracaprel 3 a. tenui & 6. 8B t Eulal ia- sancuinea a, aa t Hargeria, rapax 8.88 t Capitel la, jonesi 8.88 t Spi o- pet t i boneae 8.88 t Cl ymenel 1 a, mucosa 8.88 t Grapsidae. sp- 8.88 t Sty loch us, sp- 8,88 t Calyptraea* central is 8.88 t Anci strosyl 1 i s» ftamata a, aa t Listriel la* cf* barnardi 8.88 t Spiophanes* bombyx a, aa t Pect i nari a* goul di i 8.88 t LuMbrineris* sp* D 8.88 t Mel i ta* append i cul at a 8.88 t

85 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION 1 - WET SEASON Haplocytberida. setipunctata 4019. 9 J 49 Nematoda. spp. £0BB. 95 £5 Laeonerei s. cul veri 394. 96 5 Odostoroia. sp. 394. 9& 5 Cl adocera. sp. 35 J . KB 4 Chi ronoroi dae. spp. 175.54 £ Bi va J vi a. spp. 1 BB, 7B £ Cyattoura. pol ita 1 57. 98 2 Alroyracuma. sp. 1 05. 3£ i Grandidierel 2 a, bonnieroides B7. 77 1 Neopanope. t ex ana. t ex ana fei.43 1 Mul ana. 1 at era 1 is. 5£. BB 1 Corophi uin. 1 oui si an urn 43. SB i Strebl c«s pi o. benedi ct i 43. 86 i Vaunthowsonia. sp. 35. 1 & t Tel 1 i na. versa col or ££>. 33 t Aropbi ctei s. jgunneri i 7. 55 t Apantbura. cf . si onata 8.77 t Lei toscol opji os. sp. 8.77 t Gastropoda, sp. 8. 77 t Musculus. lateral is 8.77 t Pol ymesoda. carol i na ana 8.77 t Sipuncula. spp. 8.77 t

* STATION £ - WET SEASON Amygdal urn. papyri ui» i 439. 44 33 Streblospio. benedi eta 737. £7 47 Pectinaria. could i i 333. 5£ 8 Tel 1 ina. spp. £19. 4£ 5 Odostoroi a. sp. 184. 3 J 4 Cuwel la. sp. A i 57. 98 4 Aw pel i sea. hoi mesa 149.£J 3 Acteocina. canal iculata 1££. 87 3 Laeonereis. culveri 1 ££. 87 3 Meda conast us. sp. 11 4. 1 & 3 Nassari us. vi bex 9fe. 54 £ Nematoda. spp. 70. SI cf Nemert i na. spp. 5£. fefe 1 Aiapel i sea. abd ita 5£T. 66 1 Aliayracuroa. sp. 5£. BB 1 Sayel 1 a. f usca 43. 88 1 Neanthes. succinea 43.88 1 Tagel us. pi ebi us 43.88 1 Glycinde. sol it aria 35. 1 » i Bow wan a el 1 a. brasi 1 i ens a s 35. 1 0 1 Styl ochus. sp. 35. 1 0 1

86 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION £ - WET SEASON Piopatra. cuprea £6. 33 1 Edotea. tri 1 aba £fo. 33 1 Gastropoda. sp. 17.55 t Derapus. sp. A 17.55 t Amphi ct ei s. guxmeri 1 7. 55 t Pagurus. brevi dactyl us B. 77 t Cyatbura. pol i ta e. 77 t Heterowiastus. f i 1 i f ormis B. 77 t Xerca nth ura. brevi telsor* 6.77 t Mysel la, plamilata B. 77 t Dxyurostyl is. smith i B. 77 t Aw pel i sea, vadorum B. 77 t Eteone. heteropoda B. 77 t Spiochaetopterus. cost arum, oculatus B. 77 t Haplocytherida. set ipur*ctata B. 77 t Grapsidae. sp. B. 77 t Grand i di ere! 1 a. bormi eroi des B. 77 t Mysi dopsi s» bah i a B. 77 t Mysidopsis. furca B. 77 t Act eon. pimctostriatus B. 77 t Hydrozoa. sp. B. 77 t

* STATION 3 - WET SEASON Lei toscoloplos. foliosus 23i=:5. 93 45 Odostomia. laevigata J 0 79. 5B £1 Haplocytherida. seti purcctata 9£1 . 59 IB Nematoda. spp. 114. 10 £ Laeonereis. culveri 114. 10 £ Balanus. improvisus B7. 77 £ Taoel us. pi ebi us B7. 77 £ Nemert i na. spp. 7B. 99 £ Heteromast us. f i 1 i f orroi s 7B. 99 £ Tel 1 i r*a. spp. 61.43 1 Aroyodal urn. papyri urn 43. BB 1 Pol ydora. 1 i gni £6. 33 1 Almyracuma. sp. £6.33 1 Glycinde. sol it aria 17.55 t Mysi dopsi s. bi oel owi 17.55 t Mysi dopsi s. f urea B. 77 t Ol igochaeta. spp. B. 77 t Nassari us. vi be* B. 77 t Curoella. sp. A a. 77 t Grandi di erel 1 a. bonni eroi des B. 77 t Bowwani el 1 a. brasi 1 i ensi s B. 77 t Corophium. louisianum B. 77 t Sayel 1 a. f usca B. 77 t

87 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION 3 - WET SEASON Edotea- triloba 6.77 t Metoponorthus. sp. 6.77 t Vaunthowjsonia, sp. 6.77 t

* STATION 4 - WET SEASON Capi tel 1 a. jonesa £7£. 09 £4 Haplocytherida. setipunctata 1 57. 96 14 Capi tel la, cap a tat a 105. 3£ Scol ol epi s. texana 96.54 6 Neanthes, acuroinata 67.77 6 Pol ydo*~a. 1 i gna 70. £1 b Copepoda. spp. 5£. fefe 5 Neroatoda. spp. 5£. 66 5 Tell ana, spp. 43.66 4 Ci rri f orwi a. sp. A ££>. 33 £ Ol i gochaeta, spp. £6.33 £ Ax i othel 1 a. wucosa 1 7. 55 £ Kal 1 i apseudes. sp, A 6.77 1 Capi tel 1 a dae. sp. A 6.77 1 Crepidula, wiaculosa 6.77 1 A x^wandi a. jaacul at a 6.77 1 Bi val vi a. spp. 6.77 1 Het erowiast us. f a 1 i f orwi s 6,77 1 Aropel i sea, holroesi 6,77 1 Acteocina, canal aculata 6.77 1 Mercenari a, cawipechi ensi s 6,77 1 Hargeria, rapax 6,77 Parapri onospi o. pi nnata 6,77 1 Corophi ui», 1 oua si anum 6,77 Lei toscol opl os. fol iosus ( 6, 77 1 Fabr a ci a. sp. A '6,77 i Ehl ersi a. cormita 6,77 1

* STATION 5 - WET SEASON Dispio. uncinata 377. 41 4£ Eudevenopus. honduranus 67,77 10 Acanthohaustor-i us. mi 1 1 si 70, £1 6 Lei toscol opl os. sp. 61,43 7 Lei toscol opl os. fragi 1 is 5£, 6B 6 Streptosyl las. pett i boneae 35, 1 0 4 Branchiostowa. sp. 35, 10 4 Wegal uropus, sp. £B, 33 3 Donax, vari abi 1 i s £6, 33 3 Bowwani el 1 a. brasi 1 a ensi s 1 7, 55 £ Neroatoda. spp. 1 7, 55 2

88 Density Per­ Species or taxonomic category (No./m2 ) cent

* STATION 5 - WET SEASON Eteone, heteropoda B, 77 1 Capi tel 1 a, jonesa B, 77 1 Athenar a a, spp. B, 77 1 Athenar a a, spp. B, 77 1 Apopraonospao, pygmaea B, 77 1 Spi oni dae, sp. B, 77 1 L umbra ner a s, ernest a B, 77 1 Ta ron, tropaki s B, 77 1 Magel ona, pet t a boneae B, 77 1 Hydroi dea, sp. B, 77 1

* STATION 6 - WET SEASON Haplocytherada, setipunctata 1044.47 £3 Ol igochaeta, spp. £B0, B6 6 Kinbergonuphis, si won a £19, 4£ 5 Da opatra, cuprea £01, B7 4 Parastarte, triquerta 184,31 4 Magel ona, pet t a boneae 1 75, 54 4 Acteocina, canal iculata 1 75, 54 4 Nemert a na, spp. 166,76 4 Tel 1 i na, tampaensi s 166,76 4 Oxyurostyl i s, smi tha 1££, B7 3 Spiochaetopterus, cost arum, oculatus 1££, B7 3 Spa ophanes, bornbyx 1 1 4, 1 0 £ Copepoda, spp. 105, 32 £ Neanthes, acuminata 105, 32 £ Pr i onospi o, het erobranch a a 105, 32 £ Sty loch us, sp. 105, 3£ £ Tel 1 ina, spp. 105, 32 £ Er i cthoni us, brasi 1 a ens a s B7.77 £ Nematoda, spp. B7, 77 £ Pol ydora, webs t era 70, £1 £ Apopr i onospi o, pygmaea 61,43 1 Ampel i sea, holmesi 5£,66 1 Mysel 1 a, pi anul ata 5£,66 1 Paguri dae, sp. 5£, 66 1 Neanthes, succi nea 43, BB 1 Scol ol epa s, t ex ana 43, BB 1 Tel 1 i na, versi col or 43, BB 1 Hami noea, succi nea 35,10 1 Lembos, smith i 35,10 1 Transennel la, conradi na £6,33 1 Gl yci nde, sol i tari a £6,33 1 Capi tel 1 a, jonesa £6,33 1 Phyl 1 odoce, arenae 17,55 t Balanus, improvisus 17,55 t

89 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION 6 - WET SEASON Margi nel 1 a, api ci na 1 7. 55 t Mitt-el la. 1 unata 17.55 t Phoroni s. a»~cbi tecta i 7. 55 t Pol ynoi dae. »p. A 17.55 t Port uni dae. »p. S. 77 t My&idopsis. fu^ca 8,77 t Pol yd or i d 6.77 t Aricidea. pbilbinae 8,77 t Pbyl 1 odoce. castanea 8,77 t Mysidop&is.. bahia 8,77 t Cyatbu»~a. pol i ta 8,77 t Bitanopsis. sp. 8,77 t Eteone. bete^opoda 8,77 t Malrog^aniel la. sp, B 8.77 t Lew bos- rectamjulatus 8.77 t Ha^ge^i a. y^apa.x 8.77 t Spi oni dae, sp. 8.77 t Tacjel us, pi ebi us 8.77 t Tu>"boni 1 1 a. sp. 8.77 t Laevica^di uro. roortoni 8.77 t Poda^ke. obscura 8.77 t Ly &i anopsi s- of, a 1 ba B. 77 t Listriel la. cf. ba^r»a)«di 8.77 t Lucina. radians 8.77 t Ax i othel 1 a. wucosa 8.77 t Bracbidontes, e.xustus 8.77 t Lei toscol opl os» sp. 8.77 t Carazz i el 1 a, bobsonae 8.77 t Chone. ame^i cana 8.77 t Seol opl oa. rubra 8.77 t Bival via. spp. 8.77 t Gobi idae. sp- 8.77 t Ophioph^agus. wurdwani 8.77 t Apantbura, wacjni f i ea 8.77 t

* STATION 7 - WET SEASON Haplocytberida. setipunctata 1 &#&. £0 £4 Dorvi 1 1 ei dae, sp. 1 3B0. 45 £0 Neroatoda. spp. 605. 61 9 Ol i gocbaeta. spp. 5£6. b£ 8 Anomaloea^dia, auberiawa 353. SB 5 Mi c^optbalmus* sczel kowi i 3£4. 75 5 Tel lina, tawpaensi& £54, 53 4 Pbascol i or*, sp. £54, 53 4 Acteocina, canal iculata £01,87 3 Pa^astarte. triquerta 184.31 3

90 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION 7 - WET SEASON Pol ydora, websteri 184,31 3 Copepoda, spp. 149, £1 £ Laeonerei s, cu2 veri 131, 65 £ Ceri thi UM, amscarujn 70, £1 1 Hetercwast us, f i 2 i f orwi s 70, £1 1 O2 i ve2 2 a, Mi nut a 70, £1 1 Capite2 2 a, capitata 61,43 1 Leitosco2op2os, fo2 iosus 61,43 1 Typosy2 2 i s, cf , 2 utea 35,10 1 Pri onospi o, pi nnata £6,33 t NeMert i na, spp. £6, 33 t A2Myracui»a, sp. £6,33 t Axiothe2 2 a, wucosa £6, 33 t Po2 ydora, 2 i gr*i £6, 33 t Odostowia, product a 1 7, 55 t Gastropoda, sp. 17,55 t Mage 2 ona, pet t i boneae 1 7, 55 t Saye2 2 a, hem phi 2 2 i 17,55 t Chone, aoiericana 8,77 t Hajwi noea, succi r»ea 8,77 t Gobi i dae, sp. 8,77 t Leitosco2op2os, fragi 2 is 8,77 t Odostoroia, sp. 8,77 t Lei tosco2op2os, sp. 8,77 t Athenaria, spp. 8,77 t Eteone, rteteropoda 8,77 t Kurtzie2 2 a, sp. 8,77 t Brachyura, sp. 8,77 t St rept osy 2 2 i s, pet t i boneae 8,77 t Phoronis, architect a 8,77 t

* STATION 8 - WET SEASON Hargeria, rapax £467£, 43 41 Nematoda, spp. 8671,77 14 Exooone, di spar 5£9£, 59 9 Ehlersia, cornuta £905, ££ 5 Pri onospi o, heterobranchi a 1 746, 64 3 Hi nbergomiphi s, si moni 1535,99 3 Laeonereis, cuJveri 1518,43 3 Ka2 2 i apseudes, sp, A 1395,55 £ Po2 ydora, 2 i §m 1 34£, 89 £ Parastarte, triquerta 965, 48 £ GamMarus, mucronatus 675, 83 1 Myodocopa, spp. 667, 05 1 Harpact i coi da, spp. 605, 61 1 AnoMa2ocardia, auberiana 561,73 1

91 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION B - WET SEASON Acteocina* canal iculata 535* 40 1 GraraJ i d i ere J la* bonni eroi des 456* 40 1 GramiJ i r»a, ovul i far-mi & 438* 85 1 Ophryotrocha* sp* A 430* 07 1 Lei toscol opl os* f al i osus 394* 96 1 Neanthes* acuminata 3&B* 63 1 Cywadusa. ccuwpta 333. 5£ 1 Atheriaria. spp. £9B* 4£ t Calanoida. spp* £63* 31 t Phyl Jodoce* castanea £54* 53 t Axi otheJ 1 a. roucosa £54* 53 t PhascoJ ion* sp* £45* 75 t Haplocytberida* setipunctata ££B* £0 t Ol igochaeta* spp* 1 93* 09 t Ampel i sea. hc«2»jesi 1 57* 9B t Newer-t i na. spp. 157*9B t Arithozoa. sp* 1 40* 43 t Fabr i ci a. sabel 2 a 1££*B7 t Caul lenel 1 a. sp- a05*3£ t Ci r>«i f o^mi a. sp, A 1 05* 3£ t Lyor/sia, hyal ir»a. floridaria 1 05* 3£ t Apanthura, jaagni f i ea 1 05* 3£ t Pa raster-ope, poJ 3 ex B7*77 t Edotea* tr-i 1 oba B7* 77 t Odostomia* product a B7* 77 t Mysi dopsi s, bi gel owi B7*77 t Lysi anop&i &. cf . al ba 7B*99 t Cirrophorus, lyra 70* £1 t Aiwygdai urn, papyri urn 70* £J t Spftaero&yl 1 is* lonoacauda 70. £i t Braehi dontes. ex ust us B(l * 43 t Schi stowieri «QOS, rudol phi 5£* 66 t Cerapus, sp* A 5£*66 t Chone. amerieana 5£* 66 t Tel 2 i na. tanopaensi s 5£*66 t By pt i s- br e v i pa 1 pa 43* BB t Cerithi uro. wuscaruwi 43* SB t A bra, aequal is 43* BB t Oxyurostyl is* smith i 43* BB t Capitella* capitata 43* BB t Aricidea* philbinae 43* B& t Magel ona* pett i borieae 43. BB t Sty loch us* sp* 43* B& t Amphi uri dae* sp* 35* 1 0 t Caecum* pul chel 1 urn 35*10 t Hippolyte* pleuracanthus 35* 10 t Haroi noea* el egaris 35* 1 0 t

92 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION B - WET SEASON Margi nel 1 a. 1 aval 1 eeana 35. 1 & t Turboni 1 la. dal 1 i £6. 33 t Scol opl os. r ubra £fe. 33 t Tnaryx. cf. dorsobranchial is £6. 33 t Dphiophrajgjflus. f i lograneus £fe. 33 t Typosy 1 lie, cf . 1 utea £6. 33 t Sabel 2 a. wel anost i gmae ££>. 33 t Tapbrowysis. bowwani £6>. 33 t Chione. cancel lata cfB. 33 t Marginel la, apicina ££>. 33 t Mysel 1 a, pi anul ata ££. 33 t Cycl aspi s. sp, A £6. 33 t Nudi branch i a. spp. 1 7. 55 t Streblospio, benedicti 17.55 t Parahesione. luteola 1 7. 55 t Paracaprel la. tenuis 1 7. 55 t Cyclopoida. spp. 1 7. 55 t Sty loch us, &p. 1 7. 55 t Brand a. cl a vat a 17.55 t Diastoma, vari urn 17.55 t Corophi \.\ta. 1 oui si anum 17.55 t Sprtaerosyl 1 i ». taylori 1 7. 55 t Phororu s« archi tecta 17.55 t Anopl odacty 1 us. pet i ol at us 17.55 t Leptosynapta. inharens 17.55 t Crepidul a.maculosa B. 77 t Erichsonella. cf. attenuate B. 77 t Ol i vel 1 a. pusi 1 1 a B. 77 t Gl yci nde. sol i tari a B. 77 t Listriel la. cf . barnardi B. 77 t Bowwani el 1 a. port or i censi s. cowpl ex B. 77 t Turridae. sp. B. 77 t Bu2 la. striata B. 77 t Si pujocul a. spp. B. 77 t Luwbri neri s. ernest i B. 77 t Donax. variabi 1 is B. 77 t Act eon. punctostriatus 6.77 t Laevicardi uro. iwortoni B. 77 t Spiophanes. boxabyx B. 77 t Sphaerosy 1 1 i s. pi r i f eropsi s B. 77 t Medioroastus. sp. B. 77 t Ampel i sea. sp. B B. 77 t Nudi branchi a. spp. B. 77 t Arabel 1 a. mutans B. 77 t Brachyura. sp. B. 77 t Eteone. heteropoda B. 77 t

93 Density Per­ Species or taxonomic category (No . /m2 ) cent

* STATION 9 - WET SEASON 3^' .Xenanthura. brevitelson £159. IB Parastarte. triquerta 12S&.23 19 Aricidea- phi Ibinae 9£'J. bS 14 Harpact a coi da. spp. 746. 05 11 Fabri ci a. sabel 3 a 43tf. fci? 6 Bargeria. rapa.x ^ 01.87 3 Haplocytherida. seta punctata J3J.£>S jC Mar-Dine! la, apicina 1 05. 3i? £' Aricidea. sp. i 05. 3£: jd Typosyl lie, cf . 1 utea 87. 77 1 Cer i th i i dae. sp. 78. 99 1 Acteocina. canal iculata 7B. 99 1 Laeonerei s. cul veri 5£. fcfc 1 Capitel 1 a, capi tata 5£'. SB 1 Anomalocardi a. auberiana 43.88 1 Nematoda. spp. 35. i 0 1 Parapionosyl lie, longicirrata £:'o. <^!>i^< t Almyracuroa. sp. i 7. 55 t Granul i na- ovul i forma s 17.55 t Grandidi er-el 1 a. borma eroa des i 7. 55 t Newert i «a- sop- j 7. 55 t Ol i Docftaeta. spp. i 7. 55 t Phascol i art. sp. 17.55 t Tel 1 ana. tawpaensi s 1 7. 55 t Tharyx, cf. dorsobranchial is 1 7. 55 t Bi val vi a. spp. 1 7. 55 t Lyonsia. hyal ina, floridana 8.77 t Lei toscoloplos. fol iosus B. 77 t Heteroroast us, f i 1 i f orwi s B. 77 t

* STATION 1® - WET SEASON Odostoroia., product a 400£'. 35 3 Acteocitta. canal iculata ££8S. 04 £ Bat a 1 lari a. minima 1 843. 1 9 1 Lyonsi a. hyal ina. floridana 1 5&S1. 3£' 1 Lei toscoloplos. fol aosus 983. 03 1 Phascol ion. sp. 904. 04 1 Ar i ci dea. pn i 1 bi nae 710. 94 1 Laeonerei s. cul veri 605. 61 t Tharyx. cf . dorsobranchial is 605. 61 t Tel 1 i na. tampaensi s 43B. 85 t Haplocytfjerida. set i punctata 359. 86 t Hetero/wast us. f i 1 i f orwi s £89. 64 t Hami noea. succi nea £36. 9B t Hama noea. el egans 1 93. 09 t Nemert i na. spp. 1 40. 43 t

94 Density Per­ Species or taxonomic category (No./m2 ) cent

* STATION 10 - WET SEASON Alwyracuroa. sp. 1 31 . 65 t A.xi otbel 1 a. mucosa 114. 10 t Ceri tbi ui». wuscaruiw 36. 54 t Nassari us. vi be.x 36. 54 t Pri onospi o. beterobrancbi a 87.77 t Aftoiaa 1 oca r d i a . a u ber i a na 67.77 t Pol ydora. 1 i oni 87.77 t Capi tel la. capi tata 7B. 99 t Sayel la. bewpbi 111 70. £1 t Newatoda. spp- 61.43 t CTO C.C Portunidae. sp. _UZ. DO t

Exooone. di spar IM^JC . &C^ t Opbiopbraowus. f i lograneus 43. BB t Tel 1 i na. 1 i neat a 43. SB t Ol i oocbaeta. spp- 43. BB t Gastropoda. &p. £6. 33 t Eteone. beteropoda £6. 33 t Granul ina. ovul i f orrois £6. 33 t Glycera. americana £6. 33 t Hargeria- rapa.x £6. 33 t Stylocbus. &p. £6. 33 t Ceri tbi urn. sp. 1 7. 55 t Aropbicteis. ounneri 1 7. 55 t Dr i 1 onerei s. 1 onoa 1 7. 55 t Pbyl lodoce. castanea 1 7. 55 t Myodocopa. spp» 1 7. 55 t .Xenantbura. brevitelson 1 7. 55 t Fabr i ci a. sabel 1 a 1 7. 55 t Copepoda. s.pp. 17.55 t Warginel la. apicina 1 7. 55 t Mel i nna. wacul at a B. 77 t Melongena. corona 8.77 t Turboni 1 1 a. conradi 8.77 t Spbaero&y 1 1 i s. 1 ong i ca uda 8.77 t Scololepi&. te.xana B. 77 t Bi val vi a. spp. B. 77 t Caecum. pul cbel 1 uw B. 77 t Cyatbura. pol ita S. 77 t Sayel la. fu&ca B. 77 t Crepidula. pi ana B. 77 t Diopatra. cuprea B. 77 t Parastarte, triauerta 0. 00 &&

95 Density Per­ Species or taxonomic category (No./m2 ) cent

* STATION 11 - MET SEASON Tell ana, versicolor 333, 5j£ £5 Spa rorba s» corruoat us 1 £'£, 87 9 Donax, var i aba las 114, 10 9 <7 Port una dae, sp. SB, 54 Crepidula, pi ana 7B, 99 6 Spbeni a, ant all ensa s 7S, 99 6 Cope pod a* spp. 7B, 99 6 Cycl aspa s, so- B 5£, BB 4 Neroert a na, spp. 43, BB 3 Arroandia, mac ul at a 43, SB 3 Dispio, uncinata 35, 1 0 3 Macroprotopus, raneya 35, 1 0 3 Glycinde, sol it aria SB. 33 S £ Apopr i onospa o, pygroaea SB. 33 Er a ctboni us, brasi 1 i ensi s 1 7, 55 1 Pol ydora, 1 i gna 17,55 1 Magelona, petti boneae 1 7, 55 1 Glottadia, pyrawadata B, 77 1 Bi val via, spp. S, 77 1 Cuwella- sp* A 8, 77 1 Hapl ocytner i da, set i punct at a B, 77 1 Hydroa dea, sp» S, 77 1 Dl igocbaeta. spp. S, 77 1 Nematoda. spp* S, 77 1 Sabel 1 a. mel anost i cmae S, 77 1 Stylocbus, sp» B, 77 1 Eteone, beteropoda B, 77 1 LuOTbraneras, cf, Candida 8,77 1 Pol ynoi dae, sp. B, 77 1 Lea toscol opl os, sp. 8,77 1

* STATION S-i - WET SEASON Apopraonospao, pygroaea fe57. 71 £9 Acantbobaustori us. mi 1 1 si 346, 63 15 Mel 1 it a* quinqueisperf orata 177,76 B Eudevenopus, bonduranus 1 33, 3£ 6 Cycl aspa s- sp. A 97,76 4 Spi o. pett a boneae 97, 76 4 Nematoda, spp. BB, 68 4 Cba ronoroa dae- spp- 79, 99 4 79, 99 4 Neroert a na, spp. *^« Brancbiostowa, so* 71, id Nat i ca, pusi 1 1 a 53, 3£' S Cyatbura* pol i ta 44,44 S Oxyurostyl is, switni 35, 55 S Pa raster ope, pol 1 e.x 35, 55 s

96 Density Per­ Species or taxonomic category (No./m2 ) cent

* STATION S-l - WET SEASON Mi nuspi o. sp. B 17.77 1 Listrie.1 la. cf. barnardi 17.77 1 Exogone. di spar 1 7. 77 1 Bowwani el 1 a. port or i censi s. cowpl ex 17.77 1 Lucina. sp. 1 7. 77 1 Tharyx. sp. 17.77 i Glycinde. sol it aria 1 7. 77 1 Onuphidae. sp. B. BS t Laevicardi uw. wort on i B. SB t Pectinaria. gouldi i 6. BS t Brachyura. sp. B. SB t Abra. aequa.1 is B. BS t Anci strosyl 1 i s. cf . hawat a C3* CI3C* t Ti ron. tri ocel 1 at us B. BS t Oweni a. f usi f orwi s B. SB t Travi si a. hobsonae B. BS t Luwbrineris. sp. D B. SB t Munna. cf hayesi B. BS t Harpacticoida. spp. B. SB t Cycl aspi s. sp. B B. BS t Arwandi a. wacul ata B. SB t Anacbis. obesa S. BS t Phoroni s. arch i t ect a B. SS t Phyl 1 odoce. arenae B. BS t.

* STATION S-£ - WET SEASON Parapri onospi o. pi nnata 9£'4. 35 3ti Pectinaria. gouldi i 355. 5£' 12 Medi owast us. sp. £4B. B6 B Enteropneusta. sp. £13. 31 7 Glycinde. sol it aria 1 59. 9B 5 Parahesione. luteola 1 4£. £i?i 5 Stylochus. sp. 1 33. 3£r 4 Cycl aspi s. sp. A 1£4. 43 4 Newer t a na. spp. 1 1 5. 54 4 Pi nnother i dae. sp. 1 06. 65 4 Minuspio. sp. B 97. 76 3 .Xenanthura. brevitelson 53. 3i? £ Cycl ostrewi scus. pentaoonus 35. 55 1 Neanthes. succinea £-6. 66 1 Newatoda. spp. £6. 66 1 Gypt is. brevi pal pa £'6. 66 1 Awygdal uw. papyri urn £6. 66 1 Awpel i sea. abdi t a £6. 66 1 Coroph i uw. 1 ou a si an urn 1 7. 77 1 Glottidia. pyrawidata 17.77 1

97 Density Per­ Species or taxonomic category (No./m2 ) cent

* STATION S-£ - UiET SEASON Panna.xa- pearsea 1 7. 77 1 D'l a gocbaeta- sop- 6-BS t Ampel a sea- bolmesa B- 88 t Cyatbura- pol a ta 8- 88 t ODyra des. ai pftaerostra s 8- 88 t Cerapus- sp- ft 8-88 t Acteocina- canal acul ata 8-88 t Grandadaerel la- bonnaeroades 8- 88 t Act eon- p u net ost r a a t u s 8-88 t Dd os t CUB a a - s p - 8-88 t Pnyl lodoce- arenae 8-88 t Parasterope- pol lex S- 88 t Pol ydora- 1 a ona 8-88 t St rebl ospa o- bened a ct a 8-88 t G'l ycera- aroer a cana 8- 88 t Tbary.x- sp- 8- 88 t

* STATION S-3 - WET SEASON Parapra onospao- pannata 853- £'4 JC i_< £'3 Par-aste^ope- pol 1 e.x 799- 9£ Ma nuspa o- sp- B 595. 49 t Cycl ost^ewa scus- pentagon us 373- £'9 4 Cara^zael la- bobsonae i£'4- 43 3 ii' Hesionadae- sp- I 0b- 65 Cycl aspa s- sp- A 79- 99 x? Ma coma- tent a &^'- £J £ Aropel a sea- abda ta fc.jC'- JC'Ji £ Heroa pbol as- eionoata 5j;- 3i£ 1 Panna.xa, pea^sea 44- 44 1 Stnenel a a s- sp- A 44- 44 1 Nud a branch a a- spp- SB. b6 .1 Leucon- sp- A £b- bb i Pect a na^a a- ctou.'i da a J7-77 i Saoambra- bassa 1 7- 77 i G I y c a nd e- so 1 a t a r a a J 7- 77 t Parawpfja nc«me- sp- B 17- 77 ji Meda owiast us- amt»a seta 8- 88 t Gona ad a des- carol a nae 8- 88 t Amyrjda! uw- papyra UM 8- 88 t Nassara us- vi be* 8- 88 t Pet t a fconea a- sp- A 8- 88 t Ancistrosyl 1 as- cf- ttawata B- 8tf t StyJocnus- sp- 8- 88 t Pa nnotbera dae- sp- 8- 8tf t O.x y ur ost y I a s- s-m a t n a 8- 88 t. Tel 1 a na- versa col or 8- 88 t

98 Density Per­ Species or taxonomic category (No . /m2 ) cent

* STATION S-3 - WET SEASON Anadara. transversa B. SB t 6yptis. brevipalpa S. SB t Calanoida. spp. B. SB t

* STATION S-4 - WET SEASON Awygdal uw. papyri uw> £799. 7£ 40 Pectinaria. gouldi i S35. 47 !£ Newer t i na. spp. 4BB. S4 7 Cycl aspi s, sp. A 373. £9 5 "V O Ljt d * % Glottidia. pyrawidata OJU-O* Ow* 5 Glyci nde. sol it aria 311.0B 4 Haroinoea. succinea £31 . 0S 3 Wed i owast us. a/nbi set a £1 3. 31 3 Act eon. p u net ost r i a t u s £04. 4£ 3 Parapri onospi o. pi nnata 1 95. 53 3 Apopri onospi o. pygwaea 1 59. 9B £ O.xyurostyl is. swithi 1 4£. £0 £ Caecum. pul cttel 1 um 79. 99 1 Sty loch us. sp. 71. 10 i Nat i ca. pusi 1 1 a &£.£! i Parasterope. pol 1 e.x 44.44 1 Cycl ost reroi scus. pentagonus 35. 55 i Parahesi one. luteola 35. 55 i Nematoda. spp. 35. 55 i Odostomia. sp. £6.66 t Am pel isea. abdi ta £6. 66 t Ol igochaeta. spp. £6.66 t Mi mispi o. sp. B £6. 66 * Calanoida. spp. £6.66 t Diopatra. sp. 1 7. 77 t Neantbes. succinea 17.77 t Acuiwinodeutopus. naolei 17.77 t Mysel la. planulata S. SB t Scol opl os. rubra B. BB t Phyl lodoce. castariea S. BB t Exooone. lourei B. BS t Nucula. proxima S. BS t Scol ol epi s. t ex ana B. BB t Mysi dopsi s. bi gel owi S. SS t Oweni a. f usi f ormi s B, BB t St rebl os pi o. bercedi ct i B. SS t Tel 1 i na. versi col or B, SB t Turboni 1 la. dal 1 i S. SS t Lucina. nassul a B. SB t Spiophanes. bombyx S. SS t Pol ynoi dae. sp. B. SB t

99 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-4 - WET SEASON Nereidae. sp. e. ea t Acteocina. canal iculata &, && t By pt i s. brev i pa 1 pa B. &B t

* STATION S-5 - WET SEASON Srandidierel la. bonnieroides j 9953. 56 3B Coropn i uw. 1 ou i si anuw 13491.98 £4 Aw pel isea. abdi ta 11874. 37 £1 Awygdal uro. papyri uw fcfl79. 39 11 Cyatmira. pol it a 1 653. 1 fe 3 Neroatoda. spp. 444. 40 1 StrebloBpio. benedict a 417.73 1 Awphicteis. ounneri 3B4. 40 1 Edotea. triloba 311.08 1 Taoel us. sp. £31.08 t Laeonereis. culveri 1 51 . 09 t Awpel isca. bolwesi 88.88 t Eupl ana. oraci las 71. Itf t Newert i na. spp. BZ.Z1 t Panopeus. herbst i a &£. HI t Pol ydora. 1 a gni 53. 3£' t Bitanopsis. sp. £6. 6fc t Awpel i sea. sp. B £6, fc-6 t Cycl aspi B. sp. A 17.77 t Capatel la. capitata 17.77 t Dl a Docnaeta. &pp. 17.77 t rtul ina. lateral is 17.77 t Bracnyura. BO. 8.88 t Brachi dontes. e.x ust us 8.88 t Mod a ol us. rood a ol us. so uawosus B. 8tA t Neanthes. succinea 8.88 t Harpact a coa da. spp. 8. 88 t Munna. cf . hayesi 8. 88 t Stylocftus. sp. 8.88 t

* STATION B-B - WET SEASON Apopraonospio. pygwaea b3l. 04 £5 Med i owast us. awbi set a 391.07 Ifc Carazziel la.nobsonae 1 95. 53 8 Paraprionospio. pinnata .177.76 7 Newer t i na. spp. 1 4£. £'0 6 Chone. awericana 71. 10 3 Glycinde. sol it aria &£'. £l 3 Mysel la. pi ami 1 at a 53. 32 £ Newatoda. spp. 44. 44 £

100 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-6 - WET SEASON Ax i othel 1 a. iwucosa 44,44 £r Cor bill a, contract a 44,44 £r Listriella. cf. barnardi 44,44 £ Phascol ion. sp. 35,55 1 Athenaria. spp. 35,55 1 Poecilochaetus, johnsoni 35,55 1 Scol ol epi s. t ex ana £6,66 1 Kal 2 i apseudes, sp. A £6,66 1 Tharyx, cf , dorsobranchial is £6,66 1 Tharyx, sp, A £6, 66 1 Parasterope. pol lex 17.77 l Cirrophorus. lyra 17,77 1 Oxyu^ostyl i &. &mi thi 1 7. 77 1 Solely a. Occident aids 17.77 1 Hargeria. x^apax a, SB t Dosi ni a* di ecus a, as t Lucina. nassula a, aa t Aglaophawus* ve^^i 2 1 i a, aa t Acteocina* canal iculata a, aa t Ol igochaeta- spp* a, aa t A^icidea* phi Ibinae a. aa t Syllides* sp. a, as t Diplodonta. punctata a. aa t Stbenel ai s- sp> A a, aa t Mi crophol i s. atx^a a, aa t Sty loch us* sp­ a, as t iel 1 ina* spp» a, aa t P>«ionospio* hete^ob^anchia a, as t Wul ina. lateral is a. aa t Brachyura- sp. a. as t Exooone. at 1 ant i ca a. aa t Axiognathus. squamata a, aa t Lyonsia. hyal ina. f loridana a, aa t Ehle^sia* commit a a, aa t Eudevenopus. hondu^anus a, aa t Laevi cardi urn. wort on i a, as t Onuphis. sp. a. aa t Cbaet- ozone* sp. a. as t Lurobri ne^i s* sp. D a. aa t Haplocythe^ida^ seta punctata a, BB t Asthenot-haerus, hewi phi 1 1 i a, aa t A>»icidea- fragilis a, aa t Mi nuspi o. sp. B B, aa t Lucifer. faxoni a, aa t Calanoida. s.pp. a. aa t Poly dor a* social is a, aa t Lei toscol opl os. f ol i osus a, aa t

101 Density Per­ Species or taxonomic category (No./m2 ) cent

* STATION S-7 - WET SEASON Fa bra ci a. sabel 1 a 5524 7* 81 44 A.xi otbel 1 a. roucosa 3ifefe7*94 £5 Coropbi urn. 1 ou i si anuro 5901 * S3 5 Eri ctborii us* brasi 1 i er»si s 3£'0B* 56 3 Newatoda* spp* 312B.57 £ Exogone* dispar £T9J 5* £& £ Cbone* americana 1B57*59 1 Crassir*el la. 1 umilata i SS7* 59 1 Pbol oe* sp* 1 5B£* 06 1 Vaunt bowisonia* sp* 1 1 B£* 1 0 1 Tel 1 ir*a* spp* 1 004* 34 1 Microdeutopus* royersi 959* 90 1 Anoroia* simplex 915*46 1 Tagel us* di vi sus 635* 47 1 Podarke* obscura Bl 7* 69 1 Caecu/0* strigosujw 70£* i 5 1 Opbiolepis* sp* 666* 60 1 Myodocopa* spp. 639* 93 1 Paleanotus* r»ete^oseta 631* 04 t Ol i cjocbaeta* spp* 559* 94 t Nemertina* spp* 5£4* 39 t Pa^a/npbi riome* sp* B 435* 51 t Quest a* caudicirra 3S£* IB t Spbaerosyl 1 is* taylori 3B£* 1 B t Caul le^iel la* sp* 3 73* £9 t Maera* cf * wi 1 1 i amsi 346* 63 t Cbione* cancel lata 319*96 t Boni adi des* carol i nae 31 9* 96 t Brani a* cl avat a 311*0B t Cerapus* sp* A 30£* 1 9 t Antburidae* sp* 266* 64 t Hewii pod us* rose us £57* 75 t Tiron* triocel latus £39*97 t Spbaerosyl 1 is* glandulata ££ £* £0 t Polydora* social is £:££* £0 t Microprotopus* raneyi £13*31 t Boguea* eni gwat ica 1 95* 53 t Cumel la* sp* A 1 59* 9B t Astftenotbaerus* nerni ptti 1 1 i 1 51 * 09 t Lyonsia* byal ina* floridana 151*09 t Pnyl 1 odoce* castanea 1 4£* £0 t Kinbergonupbis* simoni 1 4£* £0 t Corbula* contract a 1 33* 3£ t Holotburoidea* sp* . 1 33* 3£ t Gi tanopsi s* sp* 1 33* 3£ t Ar i ci dea* cf * catber i r

102 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-7 - WET SEASON Anthuridae, sp. 124,43 t Semel e, purpurascens J£4, 43 t Acuminodeutopus, nag lei 124,43 t Transennel 1 a, canrad i na 115,54 t Spi o. pett i boneae 1 1 5, 54 t Medi omast us, sp. 97,76 t Paguridae, sp. 97,76 t J sol da, pulchella ea.ee t Crepidula, pi ana SB, SB t Phascol i on* sp. SB, SB t Polyplacophora, spp. BB, SB t Phot is, pugnator BB, BB t Eunice, vi ttata 79,99 t Lembos, smith i 79,99 t Lioberus, castaneus 79,99 t Priapulida, sp. 79,99 t Paracaprella, tenuis 79,99 t Teinastoma, sp. 71, 1® t Munna, cf . nayesi 71,10 t Calanoida, spp. 71,1® t Haplocytherida. set ipu net at a 71,10 t Phyl 1 odoce. arenae 6£,£1 t Harpact i coi da. spp* &£,£! t Cardi idae. sp. ££,£! t Branch i ost o/na, ep. &£,£! t Podocopa, spp. 53, 3£ t G 1 y cewer i s. pect ana t a 53,32 t PI at yhel mi nthes. spp. 53,32 t Acroci rrus. front if Him 53,32 t Anadara, trans versa 53,32 t Caecum, iwbricatum 44,44 t Nat i ca, pusi 1 1 a 44,44 t Calyptraea, central is 35,55 t Caecum, insular urn 35, 55 t Eunice, vi ttata 35,55 t Turboni 1 1 a. sp» 35,55 t 35,55 t Myri ochel e, ocul at a «\tfe* «a~ cr Spheni a, ant ill ensi s 35, 55 t Ol i vel la, deal bat a 2&,&& t Dentatisyllis, carol inae ZB.B& t Archiannel ida, sp. 26, 66 t Panopeus, herbsti i 26,66 t Scol opl os, rubra 26,66 t Mi nuspi o, sp, B 26,66 t Parapionosyl lis, longicirrata 26,66 t Pseudopolydora, sp. 26,66 t Serol i s, wgray i 26,66 t

103 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-7 - WET SEASON Bracfjyura. sp. 1 7. 77 t Caecum, pul cbel 1 uro 47.77 t Dosi ni a. di scus 17.77 t Lembos. set os us 17.77 t Cycl as- pi s. sp. D 17.77 t Mi trel la. lunata 17.77 t Listriella. cf . barnardi 17.77 t Ddontosyl 1 i s. sp. 17.77 t Lurobri neri s. 1 atrei Hi 17.77 t Batea. cf. catbarinensis 17.77 t Cycl as. pi s. sp. A 17.77 t Hc«2 othuroi dea, &p« 17.77 t Oxyurostyl i B, &»ii thi 17.77 t Aoni des. roayaguezens.! & S. &B t Awpnaret idae, &pp. B. BB t Anach i &, obe&a B.BB t Ampel i sea. abdi ta a. BB t Ar»ci &t rosyl J i s- hartwanae B. BB t Brachidorites* exust us B. BB t Dental i um~ 1 a q LI eat uw B. BB t Di astoma. va^i um B. BB t Eudevenopus. hor»duranus 6. BB t Pri onospi o. era stata S. BB t Cycl opecten* sp. B. BB t Mar-Dine! la. apicina B. BB t Polycirrus. sp. B. BB t Cooperel 1 a. at 1 ant i ca B. SB t Hal 1 i apseudes. sp. « B. BB t Blyci wde. sol it aria B. BB t Scoloplos. sp. B. BB t Neantnes. mi cromma B. BB t Pori f era. spp~ B.BB t Babel 1 ari a, vul gari s B. BB t Mi crophol i s. atra B. BB t Leptosynapta, innarens B. BB t Nairieris. sp. B. BB t Pteromeri s. per pi ana B. BB t Synelmi s* al bi ni 6. BB t Plako&yl lis. quadrioculata B. BB t Pect inaria, gouldi i B. BB t Trypanosyl 1 i s. sp. B. BB t Try pa nosy 1 1 i s- sp- B. BB t

104 Density . Per- Species or taxonomic category (No./m2 ) cent

* STATION S-B - WET SEASON Ca2anoida, spp. 551 , ®5 18 Meg a 2 uropus, sp. 506. 61 16 Streptosy2 lie, petti boneae £57, 75 8 Eudevenopus, honduranus £48, BB 8 Metnarpinia, f2oridanus 1 77, 76 6 Spi o. pet t i boneae 159,98 5 Parawphi nowe, sp, B 14£.£» 5 O2 i gochaeta, spp. 106,65 3 Er i ctnom us, brasi 2 i ensi s 79,99 3 Hem i pod us. rose us. 71, 10 £ Nematoda, spp. 71,10 £ Ax j othel 2 a. mucosa 6£,£1 £ Crassost rea, vi ro i ni ca 53, 3£ £ Branch i o&towa. sp» 44,44 1 Harpact i coi da, &pp. 44,44 1 Cyc2 aspi s, sp, B 35,55 1 Podarke, obseura 35,55 1 Brand a. clavata £6,66 1 Apanthura* roagni f i ca £6,66 1 Luci f er* f axoni £6,66 1 Parapiono&yllis* lonoicirrata £6,66 1 Po2 yd or a. soci a 2 i s £6,66 1 Apoprior/ospio, pygmaea 17,77 1 Caecum, strago&uw 17,77 1 ScoJ ol epi s», texana 17,77 1 Eurydice* lattoralas 17,77 1 Uriel a. rewianei 17,77 1 Po2 ydora, sp* 8,88 t Pi rowi &, robert i 8,88 t Brachidontes, exust us 8,88 t Mys j dopsi &. bi Del owi 8,88 t Spiochaetopterus, cost arum. ocuJatus 8,88 t Myodocopa. spp. 8,88 t Medi omast us, ambi seta 8,88 t Polyplacophora, spp. 8,88 t Nemert i r>a. spp. 8,88 t Paracaprel 1 a, temii s 8, 8B t Corbu2a, contracta 8,88 t Sphaerosy 1 1 i s, 2 ono i cauda 8,88 t Athenar i a, spp. 8,88 t Tracttypenaeus, constrict us 8,88 t Pr i onospi o, sp. 8,88 t Anchoa, sp. 8,88 t Laeonerei s. cu2 veri 8,88 t Cyc2 opoi da, spp. 8,S8 t Pag ur us, caro2 i nensi s 8.88 t Phy 1 2 odoce, castfanea 8,88 t

105 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S~S - WET SEASON Micropthalmus. sczelkowi i 8. S8 t Murcna. cf . bayesi S. BB t Anchial ir*a. typica B.BB t Am pith oe. 1 o«g i ma na B, BB t

* STATION S-9 - WET SEASON Apopriowospio. pygmaea 1 ®93. ££ 3B Arwandia- maculata 1 95. 53 7 New a tod a. spp. 166. 87 & Ql i gocbaeta. spp. 1 4£. £® 5 Med i oma s t u s. amb i set a 1 33. 3£ 5 Ol i vel 1 a. pusi Ha i 06. 65 4 Tel 1 i«a. spp. SB. SB 3 Glycittde. BO! it aria 79. 99 3 Parap^iowospio. pinnata 79.99 3 Pol ydo^a, soci a I i s 71. 10 3 Acteocina, canal iculata fecf. £1 S Car-azz i el 1 a. hobsonae &£.£! £ Spi o, pett i boneae 53. 3£ £ Ampel i sea. hoi mesi 44.44 £ Athenari a* spp* 35. 55 1 Cal ar*oi da. spp« 35.55 1 Aricidea, fVaoi 1 is 35. 55 1 Chone. aweri car«ata B. BB t Near/thes, acuminata B. SB t Scololepis. tewarja- B. SB t Bast^opoda. sp. B. BB t Lumbr^i r»eri s. ve^^i Hi B. SB t Newest i na. spp. B. BB t

106 Density Per­ Species or taxonomic category (No . /m2 ) cent

* STATION S-9 - WET SEASON Stylochus, sp. S, BB t Pseudopolydora, sp. B-B& t Pri onospi o» heterobranchi a B.BB t Phoroni s, archi tecta B.BB t Pa^asterope, pol 2 ex B.BB t ParacapreJi la, tennis B.BB t

* STATION S-10 - WET SEASON Listriel la- cf , barna^di 3£rS, 85 13 Mediowastus, a/»biseta 3»£, 1 9 12 Wysi dopsi s, bi gel owi 1 BB. B7 B Haw a noea, succi nea 1 4£, £» 5 Newest ina, spp. 1 33, 3£ 5 Diopatra, cuprea 133,3^ 5 Pol ydora, 1 i oni 124, 43 5 O.xyurostyl is. smith i i 1 5, 54 4 Mysidopsi s. bahia i 06, 65 4 Gl yci nde. sol i tar i a 1 06, 65 4 Pa^ap^ionospio. pinnata BB.BB 3 St rebl os pi o» benedi ct i 79, 99 3 Aw pel i sea. hoi roesi 73, 10 3 Acteocina* canal iculata *=>£.£ 1 £ Ol iDochaeta- spp. S3, 3£ £ Cycl aspi s. sp. P 44,44 £ Cal anoi da, spp. 33, 55 1 Apopr d onospa o- pygwaea 35, 55 1 Scol opl os, rubr^a 35,55 1 St y 1 oeh us, sp. 35,55 1 Scololepis, te.xana ZB,&B 1 Mysel la, planulata 2B.BB 1 Tel 1 i na, t awpaensi s 2B.BB 1 Edotea, t ri 1 oba 17.77 1 Mi nuspi o, sp, B 17,77 1 Capi tel 1 a, capi tata 17.77 1 Onuphidae, sp. 17,77 1 Athenaria, spp. 17,77 1 Nematoda, spp. 17,77 1 Me»di omast us, sp. 17,77 1 AeuMinodeutopus, nag lei 17,77 1 Aricidea, phi Ibinae 17,77 1 Phascol ion, sp. 17,77 1 Agl aophamus, verri Hi B, SS t Aw pel isea, abdi ta B.BB t Ampi t hoe, 1 ong i wana B.BB t Cymadusa, cowpta B.BB t Kinbergonuphis, sinooni B.BB t

107 Density Per­ Species or taxonomic category (No./m2 ) cent

* STATION S-10 - WET SEASON Denta1iuw. 1aqueatuw S. SS t Eteone.laceta a, as t Myodocopa. spp. s. aa t Eteone. heteropoda s. as t Fabri ci a. sabel 1 a a. SB t Pagurus.brevi dactyl us a. ea t Streblospio. benedicti a, as t Phororiis. architect a s. as t Er i cthom us. brasi 1 i ensi s s. as t Pect i nari a* gouldi i B, ea t Mulir*a.lateral is s. ss t Tel1i na. versicolor e, BB t

* STATION S-ll - WET SEASQN Streblosoroa.hartmanae 4541.76 £0 Oli gochaeta* spp* 3043* 5B 13 Nematoda* spp* £&£>&* 40 1£ Cymadusa* compta J 350. 97 & Sabel1a. welanost i gmae i®S4. 33 5 Spi rorbi s« corrugat us 977. 67 4 Aricidea. phiIbinae &&&. Bl £ Medioinastus, axobiseta 479. 95 £ Balanus. venustus 473. 95 £ Sabel1ari a. vulgaris 471.06 £ Pri anaspi o.heterobranch i a 426. BS £ Theriaria* spp« 399. 96 £ Ax i othel1 a. mucosa 313.96 1 Ascidiacea.sp. 31 1 . 0S 1 Polydora*1i gni 311.0S 1 Eri cthoni us* brasi 1 i er*si s £75. 5£ 1 Glyci nde» soli tari a £66. 64 1 Oli vel1a* pusi11a £31. 0S 1 Newerti na, spp. £31 . 0S 1 Brani a.clavata £04. 4£ 1 Granuli na» ovuli forroi s £04. 4£ 1 Paraprionospio.pinnata 151.09 1 Calanoi da. spp. 1 4£. £0 1 Paracaprel1a.tenui s 1 4£. £0 1 Tel 1 i r*a» versi col or 14£.£0 1 Polydora* websteri 1 33. 3£ 1 Apopri onospi o.pygmaea 1 33. 3£ 1 Margi nel 1 a. 1 aval 1 eearia 106.65 t Turboni11a* conradi 97.76 t Luconacia. incerta as. as t Carazz i el 1 a. hobsonae SS. SS t Exogone.di spar SS. SS t

108 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-ll - WET SEASON Batea* cf* catnarinensis 79*99 t Medi owast us* sp* 79,99 t Crassostrea* virginica 79*99 t Q3 i vel IB. mi nut a 79* 99 t Pol yd or a. soci al a s 71* JllZi t Margi nel 3 a* api ci na 71* 10 t Hawi noea* succi nea 71* 10 t Onupbidae* sp* 71* 10 t Spiocbaetopterus* cost a rum. oculatus 71* 10 t Bog uea* eni groat a ca 71* 10 t Enl ersi a* cornuta &£.£! t Laevi cardi urn, wortoni &£*£! t Cap! tel 2 a, jonesi fe£*£l t Ampe2 i sea, bo .3 mesi fc£*£l t Microprotopus. r^aneyi feirf*£rl t ErichsoneJ 2 a* cf« at ter/uat a 53* 3£? t Arj»ar»dia» maeulata 53* 3£ t Sy 3 2 i des» f 3 ori dana S3* 3£ t Myodocopa* spp. 53* 3£r t Cerapus, sp» A AA. AA t Tharyx. cf . dorsob^anehial is AA* AA t L istrieJ 3a^ cf* barnardi AA* AA t Lew bos, set os us AA* AA t Aeteocina- canaJ icuiata 35*55 t Neant^es, acuwinata 35*55 t Museul us* 2 ateral i s 35*55 t Grand id a ere! la* bormaeroi des. 35* 55 t Kinbergo«uphis* siinoni 35*55 t Paouridae* sp» 35*55 t Harpact i eoi da* spp* £&*£>& t Pi rmotheri dae* sp* £&*&& t Nudi branch i a* spp* ££.* BB t Hippolyte* pleuracar»thus 2B.BB t Enteropneusta* sp* ZB.BB t Spnaerosyl 1 is* lonoicauda SB. BB t Lei toscol op2 os* f c«2 i osus £&*&& t Exogone* at 1 ant i ca £B,BB t Lucina* nassuJa ZB.BB t Pect i nar i a* DOU 2 d i i £&.&& t Ampe2 isca* abdi ta 2B.BB t Medioi»astus* cal i f ami ens is 2B,BB t Brachyura* sp* 17*77 t Pol ymesoda* carol i ni ana 17*77 t Dental i urn* eboreuw 17*77 t Fabr i ci a* sabel 1 a 17*77 t Abra* aequal i s 17*77 t Autolytus* dental i us 17.77 t

109 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-ll - WET SEASON Poeca lochaet us, johnsona 17.77 t Ma mispa o, sp, B 17,77 t Paracerceas, caudata 17,77 t Neanthes, succanea 17,77 t Daopatra, cuprea 17,77 t Lu/abra nera s, sp, D 17,77 t Mage! ona, pett a boneae 17,77 t Pol ynoa dae, sp, B 17,77 t Stenothoe, cf , roa nut a 1 7, 77 t Coroph a um, t ubercu 2 at um 17,77 t Aracidea, taylora 17,77 t Bryozoa* spp* 17,77 t Aroygdal urn- papyri urn 17,77 t Corophauw* Sacustre 17,77 t Ctenodra 1 us, ca rrata 1 7, 77 t Typosyi 2 a s» cf- 2 utea B, 88 t Dent a 1 a tiro, 1 aq ueat UA> 8, 8B t Parahesaone* luteoJa 8,88 t Oa tanopsa s* sp« 8,88 t Apanthura* roagna f aca 8, 88 t Nereadae. sp. 8,88 t MyriocheJie* ecu 2 at a 8,88 t La banaa, eroarganata 8,88 t PJ atynerea s- duwer-a 2 a a 8,88 t Lucana* sp. 8,88 t Sty loch us* sp. 8,88 t Mel ajona- wacul ata 8,88 t PI at yhel mi nthes* spp* 8,88 t Ampithoe* longaroana 8,88 t My sell a. planulata 8,88 t Majadae. sp. 8,88 t Pol ynoa dae« sp« A 8,88 t Hydroi des, prot ul a col a 8,88 t Ma coma, tent a 8,88 t Slottadaa* pyrajuadata 8,88 t Cycl aspa s-~ sp« A 8,88 t £1 asroopus- 1 evi s 8,88 t Pseudopol ydora* sp. 8,88 t Oxyurostyl as, swi tni 8,88 t Araphi uradae, sp~ 8,88 t Phyl lodoce- arenae 8,88 t .Xanthadae, sp. 8,88 t Coroph i uro, si ma 1 e 8,88 t Anachas, floradana . 8,88 t Eupl ana, graca las 8,88 t Athenaraa, spp. 8,88 t Tel 1 adora, crastata 8,88 t

110 Density Per­ Species or taxonomic category (No . /m2 ) cent

* STATION S-ll - WET SEASON Mactra. fragi 2 is B.BB t Xenanthura. b»~evite2son B.BB t A*~icidea. f *~aQi 2 is B.BB t Phy2 2 odoce. castanea B.BB t Ti*~on. t*~ioce2 2 at us &. BB t Po2ycera. sp. B.BB t Schistomeringos. r-udo2phi B.BB t Parastarte. t^iquerta B. BS t Photon is. architect a B.BB t

* STATION S-l£ - WET SEASON Pa*~apy*ionospio. pinnata 1 333. £0 £9 Haplocytherida. seti punctata 94£. IS 14 Medioroastus. arobiseta £13.31 5 Te2 2 i na. ve>~si co2 o*~ 1 95. 53 4 JCk tl £1 A Minuspio. sp. B I C^C** C* Tr 4 Myodocopa. spp. 1 59. 9B 4 Car-azz i el 2 a. hobsonae 1 1 5. 54 3 Neroert i na. spp. 115. 54 3 Spioc?haetopte»~us. eostaruw. oc?u2 at us 1 1 5. 54 3 Cal anoi da. spp. 79.99 £ Schistowjer-ittoos. >^udo2phi 71. Itt £ D2 i gochaeta. spp. 71. 10 £ Dxyu^osty2 is. sroithi 53. 3£ 1 That^yx. cf. dorsob>"anchia2 is 44.44 1 Nematoda. spp. 44.44 1 List>^ie2 2 a. cf . barnardi 35. 55 1 Cyc?2 aspi s. sp. A 35. 55 1 Phasco2 ion. sp. 35. 55 1 Sco2op2os. »~ubra 35. 55 1 Acteocina. cana2 icu2ata 35. 55 1 Ma coma, tent a £6.66 1 Chaet ozone, setosa £6. 66 1 A^icidea. phi 2binae £6. 66 1 Notowastus. 2atericeus £6. 66 1 Nucu2ana. acuta £ C** fc^C* 1 Axiognathus. squamata £6.66 1 Mage2 ona. pett i boneae £6.66 1 Hap2 ocythi dea. sp. 17.77 t Neaer-oroya. f 2or-idana 17.77 t Athenay^ia. spp. 17.77 t Pay^ast ey^ope. po2 2 ex 17.77 t Myodocopa. spp. 17.77 t OdostoMi a. sp. 17.77 t Oweni a. f usi f orwi s 17.77 t Diopatr^a. cuprea 1 7. 77 t

111 Density Per­ Species or taxonomic category (No./m2 ) cent

* STftTJDN S-l£r - WET SEftSDN Braettyura, sp. 1 7, 77 t Ba2 anus, venust us J7, 77 t Di pi odonta, punctata 1 7, 77 t Grubeu 3 epis, augeneri 17. 77 t ftmpe 3 a sea, h&l mesa 17.77 t Mysi dopsi s, bi oeJl owi £i /i'tt ^"t t Cy/nadusa, eompta a, aa t Lt i!i Pecti naria, gouJdi a S ^ £Z*C«* t Cttaet ozone, sp, ft a, aa t ft.x i othe3 1 a, omcosa a, aa t Neantftes, succinea a, aa t St rept osy 3 2 i s, pet t i boneae a, aa t ftthenaria, spp. a, aa t Cbaet ozone, sp. a, aa t Moor eon u ph i s, si woni a, aa t BJyci nde. soJ i taria a, aa t Lei toseolopJos, fragi Ji i s a, aa t Siijawbra, tentacuJiata a, as t Phascol i on, sp. a, SB t Nassari us. vibe.x a. aa t Phoroni s, archi tecta a. sa t Mi crodeutopus, wyersi B. aa t D2 i vel 1 a, pusa 1 1 a a, aa t K i nbergonuph i s. si woni a, aa t Pri onospi o. heterobranchi a a, aa t Harpact i coi da. spp. a, aa t Mysei 1 a, p2 anu Ji ata a, aa t By ptis. brevipaJipa a, aa t ftpopri onospi o, pygmaea a, aa t Pi 2 argi dae, sp. a, aa t L uwbr a ner a s, verr i 1 1 i a, aa t

* STftTJDN S-J3 - WET SEASON ftricidea,phiJbinae 14B4, £9 £5 ftcteocina, canaiieuJata BBB, 79 15 ftrapel a sea, ho 1 mesi B&i?, 1 £ 15 Blycinde. soi a taria £04, 4£' CycJ aspa s. sp, ft 195.53 Nemert i na, spp. i ^'s'* ^& Xenanthura, breva teJi son 1 4£, £0 CapiteJ 3 a, capitata 14£", £0 Da astoraa.vari urn * 33,3£ Seo3 o3 epi s, texana ^ ^ S- ^4 Pri onospi o, het erobranch i a 97, 76 Onuphidae, sp. 97,76 ftxi othella.mueosa 79, 99

112 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-13 - WET SEASON Harm noea, sueea nea 79, 99 I Med a owast us, awba set a 6£, £1 1 L. uwbr a nera s, verr a 1 1 a 53, 3£ 1 Phased! a on, sp. 53, 3£ 1 Thary.x, ef , dorsobrancha alas 53, 3£ 1 Parapra onospa o, pa nnat a 1 Batea, ef , cathara nensas 44, 44 1 Ddostowaa, basuturalas 44, 44 1 Pwpel a sea, abda ta 4-**, 44 1 Pol ydora, 1 a gna 44, 44 1 Atttenara a, spp, 35, 55 1 Ddostowaa, awpressa 35, 55 1 Chone, aweracana 35, 55 1 Caeeuw, pulehe! 1 urn 35, 55 1 Newatoda, &pp- £6,66 t Lyonsa a, hyal a na, f 1 or a dana £6-66 t Tel 1 a na, tampaensa s £6,66 t Sec! op! os, rubra £6- 66 t Cirrophorus, furcatus £6, 66 t Typosy! las, cf , 1 utea £6,66 t Cal arcoada, spp, £6,66 t Pcuwa nodeutopus, nag! ea £6- 66 t Turbona 1 1 a, dal 1 a 17, 77 t Cerapus, sp, P 17,77 t Braehyura, sp. 17, 77 t Eobrol gus, spa nosus 17, 77 t Medaomastus, sp. 17, 77 t Mysa dopsa s, ba gel c«wa 17,77 t Spioebaetopterus, cost arum, oculatus 17, 7/ t Ma trel 1 a, 1 unata 17, 77 t D.x y u r os t y 1 a s, sm a t n a 17, 77 t Thenaraa, spp. 17,77 t Etf?one, laeeta B, SB t /i I , ft Grand a da ere! 1 a, bonna eroa des O- OO t Ma oel ona, pett a boneae t*. SB t Tel 1 a na, versa col or B, BB t Neanthes, sueea nea tS, SB t ftwprtauradae, sp. B, BS t Aropel a sea, sp, B B, SB t ftrnph a e t ea s, g unner a B, BS t Ka nberoonupha s, samona B, SB t CorophauOT, laeustre B, BB t Myodoeopa, spp, B, SB t Pet-eon, punetdstraat us B, BS t Paraeaprel la, tenua s B, SB t Wassara us, va be.x B-BS t Hal 1 a aoseudes, so, £ B, SB t

113 Density Per­ Species or taxonomic category (No./m2 ) cent

* STATION S-13 - WET SEASON Macyodeutopus. royeysa B. BB t Ga tanopsas. sp. B.BB t Panopeus., neybst a a B.BB t Tuyyadae. sp. B. BB t Typosyl las. sp, B. BB t Cyassostyea. vayaarjica B.BB t Listed el la- cf. bayrcayda B.BB t Meo a 1 oouna , b a oe u 1 a t a B.BB t Fabya ci a. sabel 1 a B.BB t Carcthayus. cancel laya us B.BB t Paguyus. byev a dactyl us B.BB t Styebl ospa o- berceda ct a S. BB t Ol a gocnaeta, spp. B.BB t

* STATION S-14 - WET SEASON Fa b^ a ca a. sabel la 433b. fc>5 53 Ax a othel 1 a. wucosa B2Z. 1 & 7 Newatoda. spp, 46£'. l 7 5 Newert a ria- spp- £'04, 4i^ £ Meda owast us* amba seta 1 BB. b4 ExoDorje-r da spay 1 BB. 64 ir.' Ol a vel 1 a. pusa 1 1 a i£'4. 43 1 Pyaorncspao- crastat a l£T4, 43 1 Thayyx- cf- dorsobyancha al as 1 &B. £>5 1 Am pel i sea. hoi mesa 1 &B. 6S 1 Tel 1 a na* veysa col oy 97.76 i Mi cyodeutopus. wyeysa 97. 76 i Aya ca dea. pha 1 ba r*ae BB. BB i Myodocopa. spp. 73, 93 i Lurobya neya s, veyya 1 1 a 71. 10 i Calar»oada, spp. 71, 10 i Py a onospa o. heter-obyancha a 6£'. £'1 1 Ayacadea, cf . catneya r*ae 6i:', £1 i Mi mispa o- so, & 53. 3£' i Ol a Docbaeta, spp- 53, 3ii i Acuwa nodeutopus- r»aglea 53. 3£ i Pnascol a on. sp^ 44, 44 t Apopya onospa o. pyowaea 44,44 t Abya* aeoual a s 44, 4^- t Myyi ochele. ocul at a 3S, 55 t Eyact-bona us. byasa i a ensa s 35. 55 t J sol da. pulcnel 1 a 35. 55 t May Dine! la, apaca r*# 35, 55 t Byancha ost oraa. caya baeum 35, 55 t Byacnyuya, sp. 35, 55 t Payaoya onosoa o. pa nnata 35. 55 t

114 Density Per­ Species or taxonomic category (No./m2 ) cent

* STATION S-14 - WET SEASON Cftaet ozone, sp, A £b, SB t Cycl aspi s, sp, A £fc>, bb t Kal 1 i apseudes, sp, A £6,66 t Poeca lochaetus, jormsona E'S, BB t Orbani adae, sp. 8b. BB t Turbonilla, interrupt a SB. BB t Pftorona s. arctt a t ect a £B. BB t Phyllodoce, arenae £'£. BB t Streptosyl las, pettifioneae SB. BB t Solewya, occidental as SB. BB t VaunthoJwsoni a, sp. SB. BB t Mega J uropus. sp. 17.77 t Leptocnela, serratorbata 1 7, 77 t Diplodonta. punctata 17.77 t Eucerarous, praeloncus 17. 77 t Aracidea. tayJori 17.77 t Tliary.x, sp. 17.77 t Neanthes, succanea 1 7. 77 t K a nJ&ercjonupft a s, si won a 17, 77 t Lioberus, castaneus 17.77 t Spnaerosyl las, tayl or a 17.77 t Petti boneia, sp. A 17.77 t Lyonsi a, J">yal ana, f loradana 17. 77 t Dnupha dae, sp, A 1 7, 77 t Pnyl lodoce, castanea 17, 77 t Harpact a coi da, spp. 17, 77 t Holotfturoa dea. sp. 17, 77 t Pol ydora, soci alas 1 7. 77 t Pnyi lodocadae. sp, A S, BB t Spi o, pet t a boneae B, BB t Luca fer, f axona B, BB t Decamast us, sp, A S, BB t Cyatfjura. polita W. BB t Paouridae, sp. B. BB t Dent a 1 a urn. 1 aq ueat uro W. BB t D.xyurostyl a s. s/ni thi B, BB t SiDambra. tentaculata B. BB t Paracaprel 1 a, tenui s B, BB t Eudevenopus, nonduranus B, BB t Gastropoda. sp. B. BB t Macoroa, tent a B. BB t Mure.x, sp. B, BB t Tnaryx, sp, A B, BB t Meda owast us, cal i f orna ensi s B, BS t Crepidula, pi ana B, BB t rtooreonuprt i s. nebul osa B. BB t Typosyl 1 a s, cf . 1 utea B, BB t

115 Density Per- Species or taxonomic category (No./m2 ) cent

* STATION S-.J4 - WET SEASON Sy/Hptturus, pi a&a usa B, Btt t Sypt is, breva pal pa B. BB t T ur-bona 1 1 a, sp. B, SB t Thenara a, sop. B, BS t Para/»D/~>a nowe, sp, B tf, Stt t Dorva 1 1 ea dae- sp- B- Bti t Enl ersa a, cornuta B, BW t Cyd aspa s- sp, D B- BS t .Xantbadae- sp. tf , SB t Caul .1 era el la- sp* £) B- BS t Pannot.bera dae, sp. y, BB t Hydroadea- sp- B- BS t Acteocana, canai acui ata W, SB t Corbu la, cont- rar.-t- a B- BS t Grandadaerel 1 a, Donna eroades B, BB t Pa D u r j st es- h \.\mm a B, BxS t y,Sa t TyoosvlJ . ./ i a s- so,' At r> ena r- a a - s & p- B, BS t T a r on, t r a oee 1 1 a t u s B, BB t AwDrt a ct ea s- D u nner a B- BB t Nat a c-a, pusa 1 1 a B. SB t Ottawa- sp- B- BS t Sctta stowera ntos, rudol ptta B, SB t Arraanda a- wacuJ ata S- BS t Serol a s- woraya S, SB t ^jar Dane2 la, 3 aval leeana B- BS t E.xocone, at 1 ant a ca B, SB t Lysa anopsa s- cf - al £a B, BS t Peet a nara a, DO LI Ida a B, SS t Ba val va a- spp- B- BS t Cerapus, sp- A B, SB t Ba 1 anus- venust us B- BB t Anadara- trans-versa S, SB t Arabel 1 a dae- sp- S, BS t

* GDVFRNME.NT PRINTING OFFICE: 1986 - 116