DistrictCover.fm Page 1 Tuesday, May 7, 2002 12:26 PM
In cooperation with the Houston-Galveston Area Council
Fish, Benthic-Macroinvertebrate, and Stream- Habitat Data From Two Estuaries Near Galveston Bay, Texas, 2000–2001
Open-File Report 02–024
U.S. Department of the Interior U.S. Geological Survey Cover: Sun setting on Armand Bayou at Bay Area Boulevard (photograph by John C. Rosendale, U.S. Geological Survey, August 2000). U.S. Department of the Interior U.S. Geological Survey
Fish, Benthic-Macroinvertebrate, and Stream- Habitat Data From Two Estuaries Near Galveston Bay, Texas, 2000–2001
By Jennifer L. Hogan
U.S. GEOLOGICAL SURVEY Open-File Report 02–024
In cooperation with the Houston-Galveston Area Council
Austin, Texas 2002 U.S. DEPARTMENT OF THE INTERIOR Gale A. Norton, Secretary
U.S. GEOLOGICAL SURVEY Charles G. Groat, Director
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
For additional information write to
District Chief U.S. Geological Survey 8027 Exchange Dr. Austin, TX 78754–4733 E-mail: [email protected]
Copies of this report can be purchased from
U.S. Geological Survey Branch of Information Services Box 25286 Denver, CO 80225–0286 E-mail: [email protected] ii CONTENTS
Abstract ...... 1 Introduction ...... 1 Site Selection and Data-Collection Methods ...... 1 Fish, Benthic-Macroinvertebrate, and Stream-Habitat Data ...... 4 References ...... 4
FIGURES
1. Map showing location of sampling sites in Armand and Dickinson Bayous near Galveston Bay, Texas ...... 2
TABLES
1. Data-collection sites in Armand and Dickinson Bayous near Galveston Bay, Texas ...... 3 2. Fish taxa and individual counts of fish collected in Armand Bayou near Galveston Bay, Texas ...... 5 3. Fish taxa and individual counts of fish collected in Dickinson Bayou near Galveston Bay, Texas ...... 6 4. Taxonomic classification of benthic macroinvertebrates and counts of individual taxa for sites in Armand Bayou near Galveston Bay, Texas ...... 8 5. Taxonomic classification of benthic macroinvertebrates and counts of individual taxa for sites in Dickinson Bayou near Galveston Bay, Texas ...... 12 6. Physical-habitat data for stream reaches at sites in Armand and Dickinson Bayous near Galveston Bay, Texas ...... 16
CONTENTS iii Fish, Benthic-Macroinvertebrate, and Stream- Habitat Data From Two Estuaries Near Galveston Bay, Texas, 2000–2001
By Jennifer L. Hogan
Abstract Nature Center, the largest (11.4 square kilometers) urban wildlife and wilderness preserve in the Nation. This report presents data on the status of fish, Armand Bayou is characterized by meandering chan- macroinvertebrates, and stream habitat collected nels and naturally sloping banks. Horsepen Bayou is a from 10 sites in the lower (estuarine) parts of major tributary to Armand Bayou, and its drainage is Armand and Dickinson Bayous near Galveston part of the Armand Bayou drainage. Dickinson Bayou Bay, Texas, during summer 2000 and winter 2001. has a fixed channel contained by dike banks that protect The total number of individual fish caught at the the land from bank outflows. Dickinson Bayou has been five Armand Bayou sites (2,091) was greater than developed largely for residential use. at the five Dickinson Bayou sites (1,055), but the In addition to supporting numerous species of total number of fish species caught at Dickinson wildlife, Armand and Dickinson Bayous help to attenu- Bayou sites (37) was greater than at Armand Bayou ate floods and control pollution in the Houston metro- sites (30). The total number of invertebrates politan area. Wetland habitat allows floodwaters to infiltrate and evaporate and can foster natural remedia- (26,641) and the total number of invertebrate taxa tion of contaminants. Because encroaching develop- (141) were both greater at Armand Bayou sites ment and land-surface subsidence in these watersheds than at Dickinson Bayou sites (10,467 and 131, might be affecting wildlife habitat, the U.S. Geological respectively). Among habitat data, the average sin- Survey, in cooperation with the Houston-Galveston uosity of Armand Bayou sites (1.31) was greater Area Council, conducted a study to obtain baseline data than that of Dickinson Bayou sites (1.14). Mean on the status of fish, macroinvertebrates, and stream left-bank and right-bank slopes were greater at habitat at selected sites in Armand and Dickinson Armand Bayou sites than at Dickinson Bayou sites, Bayous. The purpose of this study was to gather data to although the Armand Bayou banks were lower and document current biological conditions and to compare narrower than the Dickinson Bayou banks. The biological conditions in the lower (estuarine) parts of Dickinson Bayou channel was deeper at the sam- Armand and Dickinson Bayous. This report presents pling sites than the Armand Bayou channel. data collected on fish, benthic macroinvertebrates, and stream habitat at five fixed sites in Armand Bayou and INTRODUCTION at five fixed sites in Dickinson Bayou (table 1). Armand and Dickinson Bayous, two estuaries SITE-SELECTION AND DATA- near Galveston Bay, drain urban watersheds near the COLLECTION METHODS Houston, Tex., metropolitan area (fig. 1). The natural parts of the bayous are composed of marshes surround- Sampling sites were selected initially using geo- ing large prairies and hardwood forests. The two water- graphic information system (GIS) coverages and maps sheds provide riparian habitat for numerous coastal- and chosen specifically by on-site reconnaissance. A influenced communities of wildlife that rely on unique reach was selected if it had a full meander—that is, ecosystems for survival, including scores of birds, fish, complete or nearly complete “sine wave” curvature. reptiles, amphibians, and macroinvertebrates. The Fish data were collected in each reach to deter- Armand Bayou watershed contains the Armand Bayou mine the fish-community structure (tables 2–3, at end of
Abstract 1 95o15' 95o07'30" 95o HARRIS Fish, Benthic- I–610 COUNTY Macroinvertebrate, and Armand ARM01 HOUSTON Stream-Habitat Data 29o37'30" ARM02 Armand I–45 Bayou Bayou NatureFrom Two Estuaries State Beltway 8 Center ARM03 Near GalvestonGALVESTON BAY Bay, Horsepen HRSP02 Bayou Clear HRSP01 Texas, 2000–2001 BRAZORIA COUNTY Creek CLEAR LAKE
State 146 29o30' Gum
Bayou Benson Bayou Magnolia DCK04 State 6 Bayou DCK05 DCK02 DCK03 DCK01 Dickinson Bayou
MOSES LAKE 29o22'30" GALVESTON COUNTY
Base from U.S. Geological Survey Digital data, 1:100,000 Universal Transverse Mercator projection Zone 15 0 10 20 30 KILOMETERS
EXPLANATION
Sampling site—
TEXAS ARM01, Armand Bayou at Fairmont Boulevard ARM02, Armand Bayou at Oil Field Road Study area ARM03, Armand Bayou at Bay Area Boulevard HRSP01, Horsepen Bayou at Bay Area Boulevard HRSP02, Horsepen Bayou at Middlebrook Drive DCK01, Dickinson Bayou at Cemetery Road DCK02, Dickinson Bayou near I–45 DCK03, Dickinson Bayou between Magnolia and Benson Bayous LOCATION MAP DCK04, Dickinson Bayou at Highway 3 bridge DCK05, Dickinson Bayou below Gum Bayou
Figure 1. Location of sampling sites in Armand and Dickinson Bayous near Galveston Bay, Texas.
2 Fish, Benthic-Macroinvertebrate, and Stream-Habitat Data From Two Estuaries Near Galveston Bay, Texas, 2000–2001 Table 1. Data-collection sites in Armand and Dickinson Bayous near Galveston Bay, Texas
Downstream reach Data collected boundary coordinates Sampling site Benthic Fish macroin- Habitat Latitude Longitude vertebrates
Armand Bayou sites ARM01, Armand Bayou at Fairmont Boulevard √√ √ (1) (1) ARM02, Armand Bayou at Oil Field Road √√ √29°36'38.21" 95°05'49.28" ARM03, Armand Bayou at Bay Area Boulevard √√ √29°35'18.52" 95°04'58.97" HRSP01, Horsepen Bayou at Bay Area Boulevard √√ √29°34'48.62" 95°06'04.85" HRSP02, Horsepen Bayou at Middlebrook Drive √√ √29°34'50.98" 95°05'27.56"
Dickinson Bayou sites DCK01, Dickinson Bayou at Cemetery Road √√ √29°25'28.97" 95°07'37.06" DCK02, Dickinson Bayou near I–45 √√ √29°26'25.87" 95°04'47.41" DCK03, Dickinson Bayou between Magnolia and Benson Bayous √√ √29°27'18.47" 95°03'43.64" DCK04, Dickinson Bayou at Highway 3 bridge √√ √29°27'22.55" 95°02'50.16" DCK05, Dickinson Bayou below Gum Bayou √√ √29°27'34.76" 95°00'13.46"
1 Global positioning system coordinates could not be obtained to determine latitude and longitude because of dense ground cover.
report). Fish were collected using five methods: electro- released. Unidentifiable fish were preserved in 10- fishing, fyke nets (16 meters long with 1.3-centimeter percent buffered formalin for later identification. bar mesh and a 0.9- by 1.8-meter door), gill nets, sein- Benthic macroinvertebrates also were collected ing, and trawling. Backpack electrofishing or barge from each reach to determine community structure electrofishing was used in shallow areas without boat (tables 4–5, at end of report). Macroinvertebrates were access, as described in Meador, Cuffney, and Gurtz collected from a depositional targeted habitat (DTH) in (1993). Boat electrofishing was used primarily in deep each reach by compositing five 6- by 6-inch box-core reaches with boat access. Fyke nets typically were set samples collected throughout the reach. Macroinverte- overnight and run the following morning. Gill netting brates also were collected from a qualitative multi- was used in areas of high salinity that yielded low fish habitat (QMH) by sweeping large rectangular-framed catches with electrofishing. Gill nets were either 46 dip nets beneath overhanging vegetation or snags. Each meters long with six 7.6-meter panels that had a 1.3- to 210-micrometer-mesh dip net was fitted with a 210- 7.6-centimeter bar mesh or 91 meters long with a stan- micrometer-mesh plankton bucket, and five samples were composited for the QMH benthic sample. dard 10-centimeter bar mesh. Gill nets normally were set overnight for 8 hours and checked at about 3-hour After benthic samples were collected, the com- intervals throughout the night or were set overnight and posited sample was sieved through a 210-micrometer- checked the following morning. Fish were sampled dur- mesh sieve. Woody debris was removed from the ing summer 2000 and winter 2001 to track seasonal benthic sample with forceps and by rinsing to prevent changes and to increase the number of species captured. discarding aquatic organisms. Benthic macroinverte- brates were transferred to a 1-liter polyethylene sample During processing, fish were contained in a large jar and preserved in a 70-percent ethanol solution. Sam- aerated holding tub to increase fish survivability. Each ples were shipped to a laboratory for identification and fish was measured, weighed, identified, and promptly enumeration. For each sample, a technician randomly
SITE-SELECTION AND DATA-COLLECTION METHODS 3 selected 500 macroinvertebrates from randomly FISH, BENTHIC-MACROINVERTEBRATE, selected grids for enumeration and identification to the AND STREAM-HABITAT DATA lowest taxon, as described in Cuffney and others (1993). The total number of individual fish caught at Stream-habitat data also were collected from each Armand Bayou sites (2,091) was greater than at site to determine the physical condition of the area and Dickinson Bayou sites (1,055), but the total number of factors that affect the physical condition of the reach fish species caught at Dickinson Bayou sites (37) was (Meador, Hupp, Cuffney, and Gurtz, 1993) (table 6, at greater than at Armand Bayou sites (30). The total num- end of report). Each site was divided into four transects ber of invertebrates (26,641) and the total number of with two boundaries. At each transect, the following invertebrate taxa (141) were both greater at Armand data were collected: global positioning system (GPS) Bayou sites than at Dickinson Bayou sites (10,467 and location, mean right- and left-bank slope, mean bank 131, respectively). Among habitat data, the average sin- slope, channel width, number of undercut banks, mean uosity of Armand Bayou sites (1.31) was greater than right- and left-bank height, mean-bank-height-to-width that of Dickinson Bayou sites (1.14). Mean left-bank ratio, mean wetted channel width, mean depth, and and right-bank slopes were greater at Armand Bayou mean velocity. For each reach, linear and curvilinear sites than at Dickinson Bayou sites, although the reach length, sinuosity1, number of snags, structure Armand Bayou banks were lower and narrower than the index2, and number of bars were recorded. A laser- Dickinson Bayou banks. The Dickinson Bayou channel operated total station was used to survey the entire was deeper at the sampling sites than the Armand reach, including all transects. Before surveying, the Bayou channel. total station was referenced to a benchmark or to an REFERENCES installed marker. All survey data were stored in an attached datalogger that receives data directly from the Cuffney, T.F., Gurtz, M.E., and Meador, M.R., 1993, total station. Data were transferred to an electronic Methods for collecting benthic invertebrate samples as spreadsheet to compute linear reach length, curvilinear part of the National Water-Quality Assessment Program: reach length, bank height, bank width, bank slope, U.S. Geological Survey Open-File Report 93–406, 66 p. wetted channel width, mean depth, and frequency of Meador, M.R., Cuffney, T.F., and Gurtz, M.E., 1993, in-channel structures. Methods for sampling fish communities as part of the National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 93–104, 40 p. 1 Sinuosity is the ratio of the curvilinear reach length to the Meador, M.R., Hupp, C.R., Cuffney, T.F., and Gurtz, M.E., linear reach length. 1993, Methods for characterizing stream habitat as part 2 Structure index (unitless) is the ratio of the frequency of in- of the National Water-Quality Assessment Program: channel structures for a reach to the curvilinear reach length. U.S. Geological Survey Open-File Report 93–408, 48 p.
4 Fish, Benthic-Macroinvertebrate, and Stream-Habitat Data From Two Estuaries Near Galveston Bay, Texas, 2000–2001 Total Sampling site 0020 0 2 019702828145 03221430 00310013 0 321 39 131 35 526 00080 0 8 00100 0 1 0130 1 5 411000 0 1 0 0 41 0 115 645 100 10 870 0 5 35 7 5 52 0257 620 0 0 21 0 0 21 4000 0 4 0010 0 1 0101 3 5 0711 0 9 00020 0 2 16 75 6 10 107 0100 0 1 0100 0 1 0050 0 5 0010 0 1 121930 0020 0 2 61420119 1201 0 4 0020 0 2 10000010 51000051 1510000151 218 495 963 313 102 2,091 ARM01 ARM02 ARM03 HRSP01 HRSP02 Anchoa mitchilli Anchoa Lepisosteus oculatus Lepisosteus osseus Lepisosteus spatula Brevoortia patronus Elops saurus lethostigma Paralichthys Achirus lineatus Ictiobus bubalus natalis Ameiurus Dorosoma cepedianum Dorosoma Ictalurus furcatus Ictalurus punctatus felis Arius Lepomis cyanellus Bagre marinus Bagre Lepomis macrochirus Lepomis megalotis salmoidesMicropterus Poxomis annularis Poxomis Lagodon rhomboides Mugil cephalus arenarius Cynoscion Poxomis nigromaculatus Poxomis Leiostomus xanthurus Micropogonias undulatus Pogonias cromis Pogonias Poecilia latipinna Poecilia Sciaenops ocellatus Gambusia affinis Bay anchovy Spotted gar Longnose gar Gulf menhaden Alligator gar Southern flounder Lined sole Smallmouth buffalo Yellow bullhead Ladyfish Gizzard shad Gizzard Blue catfish Hardhead catfish Channel catfish Channel Green sunfish Gafftopsail catfish Gafftopsail Bluegill Longear sunfish Largemouth bass White crappie Sand seatrout Pinfish Striped mullet Black crappie Spot Atlantic croaker Atlantic Black drum Sailfin molly Western mosquitofish Western Red drum Group Common name Family Scientific name Fish taxa and individual counts of fish collected Texas in Armand near Galveston Bayou Bay, Table 2 AnchoviesGars Engraulidae Lepisosteidae Herrings Clupeidae Lefteye floundersSolesSuckers catfishBullhead Bothidae Soleidae Ictaluridae Catostomidae Tarpons Elopidae Sea catfishSea Ariidae Sunfishes Centrarchidae Drums Sciaenidae PorgiesMullets Sparidae Mugilidae Livebearers fish of Number species fish of Number Peociliidae Table 2. Table
Table 2 5 Total Sampling site Sampling 1 22 28 2 61 114 000011 000022 500005 100001 200002 000011 0 0 0 1 53 54 302128 100146 500016 0 0 1 0 0 1 6000410 000099 020002 0 0 8 0 36 44 0 0 0 0 45 45 000011 4 1 5 1 323 334 0 14 0 20 109 143 0551112 113005 1 16 8 11 14 50 200002 DCK01 DCK02 DCK03 DCK04 DCK05 Mugil cephalus Lagodon rhomboides Archosargus probatocephalus Archosargus Lepomis macrochirus annularia Poxomis Lepomis gulosus Lepomis cyanellus Bagre marinus Bagre Arius felis Ictalurus punctatus Ictalurus furcatus Ictalurus Cyprinus carpio Ctenopharyngodon idella Ictiobus bubalus Paralichthys lethostigma Paralichthys Megalops atlanticus Elops saurus Anchoa mitchilli Anchoa Dorosoma petenense Dorosoma Dorosoma cepedianum Dorosoma Brevoortia patronus Brevoortia Lepisosteus spatula Lepisosteus Lepisosteus osseusLepisosteus Lepisosteus oculatus Striped mullet Pinfish Sheepshead Bluegill crappie White Warmouth Green sunfish Gafftopsail catfish Gafftopsail Hardhead catfish Hardhead Channel catfish Blue catfish Blue Common carp Grass carp Smallmouth buffalo Southern flounder Tarpon Ladyfish Bay anchovies Threadfin shad Threadfin Gizzard shad Gulf menhaden Gulf Alligator gar Longnose gar Spotted gar Spotted Fish taxa and individual Texas counts of fish collected near in Galveston Dickinson Bay, Bayou Fish taxa and individual Texas—Continued counts of fish collected near in Galveston Dickinson Bay, Bayou Group Common name Family Scientific name Table 3 Mullets Mugilidae Porgies Sparidae Sunfishes Centrarchidae Sea catfishSea Ariidae Bullhead catfish Ictaluridae Carps and minnows and Carps Cypriniformes Suckers Catostomidae Lefteye flounders Bothidae Tarpons Elopidae Herrings Clupeidae Gars Lepisosteidae Table 3. Table 3. Table
6 Fish, Benthic-Macroinvertebrate, and Stream-Habitat Data From Two Estuaries Near Galveston Bay, Texas, 2000–2001 Total Sampling site Sampling 0 0 0 0 55 55 0 0 0 0 40 40 000066 000011 000022 0 0 2 0 15 17 0 0 1 0 19 20 0 0 0 1 18 19 000011 000044 000011 0 0 0 0 29 29 100012 33 61 63 39 859 1,055 13 7 10 9 30 37 DCK01 DCK02 DCK03 DCK04 DCK05 Labidesthes sicculus Menidia beryllina Menidia Poecilia latipinna Poecilia Cyprinodon variegatus Caranx hippos Sciaenops ocellatus Sciaenops Pogonias cromis Pogonias Micropogonias undulatus Leiostomus xanthurus Cynoscion nebulosus Cynoscion Cynoscion nothus Cynoscion Cynoscion arenarius Cynoscion Aplodinotus grunniens Brook silverside Inland silverside Inland Sailfin molly Sailfin Sheepshead minnow Sheepshead Crevalle jack Crevalle Red drum Black drum Atlantic croaker Spot Spotted seatrout Spotted Silver seatrout Silver Sand seatrout Fish taxa and individual Texas—Continued counts of fish collected near in Galveston Dickinson Bay, Bayou Group Common name Family Scientific name species Number of fish of Number fish of Number Silversides Atherinidae Livebearers Poeciliidae Killifishes Cyprinodontidae Jacks Carangidae Freshwater drum Drums Freshwater Sciaenidae Table 3. Table
Table 3 7 Total Bay, Bay, DTH Bay, Texas Bay, HRSP02 QMH HRSP02 DTH HRSP01 7160576 200042 200032 ed habitat]ed QMH HRSP01 DTH ARM03 QMH ARM03 Sampling site and habitat type DTH ARM02 QMH ARM02 DTH ARM01 1000000 0 0 00200000 1 0 0 0 2 20000056 3400000 0 0 0 7 0000000 0 0 6 6 0000007 018631 1000000 0 0 0 1 0000800 0 0 0 8 0000040 0 0 0 4 1050000 0 0350121 0 0 6 3000000 0 0 000830003 3 8100000 0 0 0 9 0000003 2400470392140108 0100000 0 0 0 1 165 73 124 0 19 2 333 3 66 6 791 QMH ARM01 (a)000 0 9 0 9 (Say)0000000 (Pfeiffer) 0 0 24 0 0 0 693 1 26 0 744 (Banner) 0 0 602 2 267 15 343 3 20 19 1,271 (ata)004 0 0 0 4 (Hartman)0000040 (otus001000 014 (Holthuis)000014000 (Saussure) 0 0 16 0 0 0 0 0 0 0 16 sp. 0001020 0 0 2 5 sp. 0080000 0 0 0 8 sp. 0000000 0 1 0 1 Genus or sp. 0100007 0 0 0 8 sp. 0000004 sp. 0100000 0 0 0 1 s. 21400 0 0 0154 sp. 2013400000 sp. 1100000 0 0 0 2 scientific name sp. 5340000 0 0 012 s. 820004 0 0112 sp. 822600000 sp. 0 0 140 0 0 0 347 0 54 0 541 (Stephensen) (Rathbun) Hirudinea Erpobdellidae Helobdella Hydrobiidae Melanoides Biomphalaria havanensis Planorbella Planorbidae Physidae Physella Lymnaeidae Pseudosuccinea columella Ferrissia Bivalvia Sphaerium Pisidium Branchiobdellida Amphipoda bonnieroidesGrandidierella Apocorophium Hyalella azteca Mediomastus ambiseta Cambaridae Procambarus kadiakensis Palaemonetes kadiakensis Palaemonetes pugioPalaemonetes Palaemonetes louisianae Taphromysis Ostracoda Gastropoda Acari Oribatei Arrenurus Physidae Physinae Cambaridae Cambarinae Pharyngobdellida Erpobdellidae Rhynchobdellida Glossiphoniidae Mesogastropoda Hydrobiidae Mesogastropoda Thiaridae Basommatophora Planorbidae Basommatophora Physidae Basommatophora Lymnaeidae Basommatophora Ancylidae Amphipoda Amphipoda Hyalellidae Veneroida Veneroida Sphaeriidae Pisidiinae AmphipodaAmphipoda Aoridae Capitellida Corophiidae Decapoda Capitellidae Cambaridae Mysida Mysidae Decapoda Palaemonidae AcariHydrachnellae Arrenuridae Oribatei Taxonomic classification of benthic Taxonomic macroinvertebrates and counts of individual sites taxa infor Armand near Galveston Bayou Taxonomic classificationof benthicTaxonomic macroinvertebrates and counts of individualsites in taxa Armand for nearGalveston Bayou Class Order Family Subfamily Table 4 (Ostracoda) (Malacostraca) Hirudinea Crustacea Crustacea Crustacea Crustacea Gastropoda Bivalvia Branchiobdellida Arachnoidea Acari Table 4. Table 4. Table Texas—Continued [Number of individuals per taxon shown for each site and habitat type. QMH, qualitative multi-habitat; DTH, depositional site target each type. habitat QMH, for and qualitative per taxon shown individuals of[Number
8 Fish, Benthic-Macroinvertebrate, and Stream-Habitat Data From Two Estuaries Near Galveston Bay, Texas, 2000–2001 Total Bay, Bay, DTH HRSP02 QMH HRSP02 DTH HRSP01 100021 100012 7000171 217658 300063 100011 300059 QMH HRSP01 DTH ARM03 QMH ARM03 Sampling site and habitat type DTH ARM02 QMH ARM02 DTH ARM01 0002801 1000000 0 0 0 1 0090 0 019 000019000 1000000 0 0 0 1 0024082273120310 00203019070720301 2000000 0 0 0 2 000021003 0 19 0 25 2 42 0 16 0 104 1000000 0 0 00080500 1 0 0 013 0000001 QMH ARM01 s.100 0 0 0 3 sp.2100000 g.00000 0 010 gr.10000000 s.040 0 0 0 4 sp.0004000 (ulte00000 0 0 4 (Sublette)0004000 (Sublette)004000350770116 s.2280000 0 02,278 2,278000000 sp. s.1180000 0 sp. 0 616 sp. 0 0 83 4 75 0 179 3 206 45 595 s.0080000 sp. 0 0 0 8 s.0003000 sp. 0 0 0 3 g.s.0100000 0 0 0sp. 1 gr. sp. 0 0 16 0 0 0 249 1 18 6 290 s.00222000252252483 sp. sp. 0 0 652 1 10 0 420 0 986 11 2,080 sp. 5345647620534601,293 sp. 0046500 0 0 621 Genus or sp. 0000000 0 6 0 6 sp. 0 0 524 102 313 69 700 63 134 106 2,011 sp. 4200040 0 0 212 sp. 0002000 0 0 0 2 sp. 9000000 0 0 0 9 sp. 1000000 0 0 0 1 sp. 0000007 0 0 0 7 sp. 000222014 sp. 13300004 sp. 0000007 0 0 0 7 scientific name sp. 0 216 000014000 sp. 1000001 sp. 0 0 037 73000000 sp. 0000006 sp. 0080000 0 0 0 8 sp. 1000000 0 0 0 1 sp. 31122001100029 sp. 0300000 0 0 0 3 Cryptochironomus Einfeldia natchitocheae Einfeldia Glyptotendipes Goeldichironomus Microchironomus Micropsectra/Tanytarsus Parachironomus Polypedilum beckae Polypedilum Tanytarsini Chironomus Clinotanypus Dicrotendipes Cladopelma Cladotanytarsus Axarus Chironomidae frequens Parachironomus flavum Polypedilum Pseudochironomus Thienemanniella Zavrelimyia Chironominae Chironomini Apedilum Forcipomyia Ceratopogon Dasyhelea Ceratopogoninae Probezzia Bezzia/Palpomyia Collembola Odontomyia/Hedriodiscus Ceratopogonidae Notomicrus Peltodytes Stenelmis Berosus Enochrus Cybister Helophorus Hydroporinae Curculionidae Copelatus Elmidae Forcipomyiinae Dasyheleinae Diptera Chironomidae Diptera Chironomidae Chironominae Diptera Ceratopogonidae Ceratopogoninae Diptera Diptera Ceratopogonidae Collembola Coleoptera Noteridae Coleoptera Haliplidae Coleoptera Hydrophilidae ColeopteraColeopteraColeoptera Curculionidae Dytiscidae Elmidae Copelatus Taxonomic classification of benthic Taxonomic macroinvertebrates and counts of individual sites taxa infor Armand near Galveston Bayou Class Order Family Subfamily Insecta Coleoptera Table 4. Table Texas—Continued
Table 4 9 Total Bay, Bay, DTH HRSP02 QMH HRSP02 DTH HRSP01 106027 106040 100016 102013 100014 200050 100011 100011 100011 206038 200064 106017 220040 800628 100025 QMH HRSP01 DTH ARM03 QMH ARM03 Sampling site and habitat type DTH ARM02 QMH ARM02 DTH ARM01 04000 00000040 024 0 0 001400011012028 4 00240000 00000 0 080 00800000 0000001 2100001 00240001100035 001600032018066 0000001 0000001 0000003 0003000 0 0 0 3 0040001 10 1 78 0 0 0 189 0 19 0 297 8700 0 0 075 284700000 QMH ARM01 s.0100 0 0 016 00160000 sp. g.00000056619081 gr. (tl 0000001 0 1 0 2 (Stal) (White)0000501 sp. 0040000 0 0 0 4 s. 081000 022 sp. 008014000 (erc-cafe)000 0 1 0 9 (Herrich-Schaeffer)0080000 sp. 0000001 sp. 0 0 4 15 5 28 0 2 0 2 56 Genus or sp. 5100003 sp. 0040002 sp. 17140004 sp. 0080004 sp. 0000000 2 0 0 2 sp. 0000001 sp. 0000000 0 2 0 2 s. 01600 0 079 sp. 0012630202 sp. 0080000 0 0 0 8 sp. 236020032020101 sp. 1000000 0 0 0 1 sp. 0002000 0 0 0 2 sp. 0080502 scientific name sp. 0080000 0 0 0 8 sp. 6300020 2 6 019 sp. 0000002 sp. 0100000 0 0 0 1 sp. 51 101 52 0 0 0 21 4 7 42 278 sp. 0 0 20 0 0 0 179 0 12 0 211 sp. 4000000 0 0 0 4 Coenagrion/Enallagma Coenagrionidae Enallagma Ischnura Isopoda Lepidoptera Anisoptera Aphylla Argia Ranatra nigra Ranatra Rheumatobates Mesovelia mulsanti Mesovelia Gerridae Corixidae Caenis latipennis Belostoma lutarium Belostoma Belostomatidae Acentrella Baetidae Callibaetis Caenis Odontomyia Stratiomyidae Culicidae Tanypus Procladius Tanypodinae Larsia Pentaneurini Labrundinia Ablabesmyia Coelotanypodini Coelotanypus Parakiefferiella Pseudosmittia Orthocladiinae Tanytarsus Zavreliella Cricotopus bicinctus Cricotopus Nanocladius Cont. Rhagodotarsinae Stratiomyinae Tanypodinae Chironominae— Orthocladiinae Cont. Odonata Coenagrionidae Isopoda Lepidoptera Odonata Hemiptera Nepidae Ranatrinae Hemiptera Mesoveliidae Hemiptera Gerridae Hemiptera Corixidae Hemiptera Belostomatidae Ephemeroptera Baetidae Ephemeroptera Caenidae Diptera Stratiomyidae Diptera Culicidae Taxonomic classification of benthic Taxonomic macroinvertebrates and counts of individual sites taxa infor Armand near Galveston Bayou Class Order Family Subfamily Insecta—Cont. Diptera—Cont. Chironomidae— Table 4. Table Texas—Continued
10 Fish, Benthic-Macroinvertebrate, and Stream-Habitat Data From Two Estuaries Near Galveston Bay, Texas, 2000–2001 Total Bay, Bay, DTH HRSP02 QMH HRSP02 DTH HRSP01 100013 200039 100011 100021 300071 QMH HRSP01 DTH ARM03 QMH ARM03 Sampling site and habitat type DTH ARM02 QMH ARM02 DTH ARM01 00100007 0 2 5 217 8100 11 1,1590 0 0 33 18 0 529 186 0 153 0 097 0 180 70 1,277 51 10100005920 112 0 28 66 1,558 0 108 11 54 60 1,760 34 140 16 1,264 233 0 17 398 5,106 95 14 4 275 0 0 1,067 193 32 0 44 124 0000000 0 2 0 2 0000021 6100003 3500 0 0 048 133500000 42 34 54 25 31 20 65 26 46 24 141 QMH 2,779 493 4,557 338 4,517 569 7,893 504 3,449 1,542 26,641 ARM01 (Say)0000002 (ese)0000 0420143 (Webster)000010100 (ed)0000000 0 6 0 6 (Leidy) (Hartman) 0 0 46 16 112 216 0 24 0 434 848 Genus or sp. 0080006 scientific name sp. 0000001 Nematoda Nemertea Oligochaeta Enchytraeidae Naididae Tubificidae Urnatella gracilis culveri Laeonereis Nereididae Spionidae Hobsonia florida Turbellaria Decapoda Oecetis Erythemis Libellulidae Erythemis simplicicollis EnchytraeidaTubificida Enchytraeida Tubificida Naididae Tubificidae SpionidaTerebellida Spionidae Ampharetidae Trichoptera Leptoceridae Leptocerinae Taxonomic classification of benthic Taxonomic macroinvertebrates and counts of individual sites taxa infor Armand near Galveston Bayou Class Order Family Subfamily per site per site Nemertea Oligochaeta Phylactolaemata Nematoda Polychaeta Phyllodocida Nereididae Turbellaria individuals Total species per Total Malacostraca Decapoda Insecta—Cont. Odonata—Cont. Libellulidae Table 4. Table Texas—Continued
Table 4 11 Total DTH DCK05 ton Bay, ton Bay, ton Bay, QMH DCK05 DTH DCK04 QMH DCK04 ed habitat]ed DTH DCK03 QMH DCK03 DTH DCK02 Sampling site and habitat type habitat and site Sampling QMH DCK02 DTH DCK01 0 4 54 020602300019059 000 60 0 03555 1202 2400 8 00 0 14 0 0 00 140 30 0 0040 0 24 00 0 0 0 20 190 0 00 90 0 0 4 3 0 24 0720 0 0 0050 0 20 0 1 00 39 0 6 0 00 0 2 3 0 0 11 0 0 0 24 0 0 0 0 33 0 0 70 7 000 20 0 324 0 00 0 5 0 7 0 174 5 1 19 16 546 33 4 0 0 3 0 0 0 28 0 68 QMH DCK01 (ahu)90 0 0 00 0 0 19 (Rathbun)19000 (ibs0 00 0 0 00 1 0 1 (Gibbes)00 (Conrad) 8 1 71 0 0 18 0 0 0 0 98 (Banner) 146 11 3 0 0 0 6 0 0 2 168 (Vanhoffen) 0 0 0 0 0 72 0 0 0 0 72 (Frankenberg (Rafinesque) 0 0 0 0 0 0 0 0 0 4 4 (Holthuis) 0 0 0 0 0 1 0 0 723 0 724 (a)00000000909 (Say) (Rathbun) 0 0 0 0 0 0 0 0 22 1 23 (Linnaeus) 0 0 0 0 0 0 0 0 15 0 15 (Lightfoot) 0 0 0 0 0 0 0 0 0 1 1 (Sowerby) 0 0 0 0 0 1 2 0 0 5 8 (Saussure) 47 0 18 0 0 0 0 0 0 0 65 (Harger) 0 0 0 0 0 0 0 0 275 44 319 sp. 0000200503542 (a)00000000505 (Say) sp. 90000000009 Genus or sp. 0 0 0 0 0 0 0 0 28 0 28 scientific name sp. 903000000012 sp. 265 4 74 0 2 0 3 0 0 0 348 sp. 90000000009 (Stephensen) (Shoemaker) and Menzies) Bivalvia Ischadium recurvum Mytilopsis leucophaeata cuneata Rangia plebeius Tagelus Amphipoda Grandidierella bonnieroides Apocorophium Apocorophium lacustre Apocorophium louisianum Gammarus Hyalella azteca Decapoda Cambaridae kadiakensisPalaemonetes paludosusPalaemonetes pugioPalaemonetes setiferus Penaeus sapidus Callinectes Acari Edotea triloba Edotea Uromunna reynoldsi Uromunna reynoldsi Cassidinidea ovalis louisianae Taphromysis rapax Hargeria Gastropoda Ancylidae Lymnaeidae Fossaria Physella Micromenetus Hydrobiidae Sayella Curculionidae Mytilidae Lymnaeidae Lymnaeinae VeneroidaVeneroidaVeneroida Dreissenidae Mactridae Solecurtidae AmphipodaAmphipoda Aoridae Corophiidae AmphipodaDecapoda Gammaridae DecapodaDecapoda Cambaridae Decapoda Palaemonidae Decapoda Penaeidae Portunidae Amphipoda Amphipoda Hyalellidae Isopoda Idoteidae Isopoda Munnidae IsopodaMysidaTanaidacea Sphaeromatidae Paratanaidae Mysidae Basommatophora Ancylidae Basommatophora Lymnaeidae Basommatophora Physidae Physinae Basommatophora Planorbidae Mesogastropoda Hydrobiidae Neogastropoda Pyramidellidae Coleoptera Dytiscidae Hydroporinae 2 0 0 0 0 0 0 0 0 0 2 Taxonomic classification of benthic Taxonomic macroinvertebrates and counts of individual sites taxa near infor Galves Dickinson Bayou classification of benthic Taxonomic macroinvertebrates and counts of individual sites taxa near infor Galves Dickinson Bayou Class Order Family Subfamily Table 5 (Malacostraca) Bivalvia Crustacea Crustacea Arachnoidea Acari Gastropoda Insecta Coleoptera Curculionidae Table 5. Table 5. Table Texas Texas—Continued multi-habitat; DTH, depositional site target each type. habitat QMH, for and qualitative per taxon shown individuals of[Number
12 Fish, Benthic-Macroinvertebrate, and Stream-Habitat Data From Two Estuaries Near Galveston Bay, Texas, 2000–2001 Total DTH DCK05 ton Bay, ton Bay, QMH DCK05 DTH DCK04 QMH DCK04 DTH DCK03 QMH DCK03 DTH DCK02 Sampling site and habitat type habitat and site Sampling QMH DCK02 DTH DCK01 200 0 20 0 0 00 10 0 0 2 0 0 0 4 0 0 0 16 00 000 058 0 21 2 00 0 5 0 0 8 00 12 0 0 13 0 0 12 0 00 100 0 0 0 0 26 000 20 0 0 0 00 0 0 0 2 0 0 0 100 15 2 10 0 3 0 201 0 387 0 618 18 2 20 0 1 0 6 0 6 2 55 QMH DCK01 sp. 5 20 0 1 0 0 0 1 0 0 27 s.30000000003 sp. (Sublette) 0 0 2 0 0 0 0 0 0 0 2 s.026002000010 sp. s.30200000005 sp. s.30000000003 sp. (a)00000000505 (Say) s.00000200002 sp. s.30000000003 sp. (LeConte)30000000003 sp. 0 10 78 0 0 0 0 2 0 0 90 s.00000600006 sp. sp. 00000000505 sp. 0 16 0 0 0 0 0 0 0 0 16 sp. 00000000505 Genus or sp. 00201000003 sp. 13 0 554 0 0 276 6 0 28 0 877 sp. 20000000002 sp. 85 0 15 0 0 0 4 0 0 0 104 sp. 04000000004 sp. 2 30 0 0 0 0 0 0 0 0 32 sp. 126 122 669 0 30 378 165 3 37 13 1,543 sp. 0 22 6 5 0 6 0 7 0 7 53 sp. 0 10 0 0 0 0 0 0 0 0 10 sp. 0 33 0 0 0 0 0 0 0 0 33 sp. 00200000002 scientific name sp. 20000000002 sp. 208400020000106 sp. 1 10020 2 10 0 0 16 sp. 80000000008 sp. 03000000003 sp. 0 0 0 0 0 0 0 0 33 0 33 sp. 0 56060 0 00 0 0 62 sp. 0 35000 0 00 0 0 35 (Malloch) Heterelmis Stenelmis crenata Stenelmis Gyretes sinuatus Gyretes Peltodytes Paracymus Hydrocanthus Scirtidae Staphylinidae Collembola Ceratopogon Ceratopogonidae Probezzia Bezzia/Palpomyia Dasyhelea Chironomidae Chironominae Chironomini Chironomus Cladotanytarsus Cryptochironomus Cryptotendipes Dicrotendipes Einfeldia Fissimentum Goeldichironomus Harnischia Microchironomus Micropsectra/Tanytarsus Microtendipes Parachironomus nigrohalterale Paralauterborniella Phaenopsectra/Tribelos Polypedilum Polypedilum beckae Rheotanytarsus Stempellina Stenochironomus Tanytarsini Tanytarsus Tribelos Antillocladius Corynoneura Dasyheleinae Elmidae Cont. ColeopteraColeoptera Gyrinidae Haliplidae Coleoptera Hydrophilidae Coleoptera Noteridae ColeopteraCollembola Staphylinidae Coleoptera Scirtidae DipteraDiptera Ceratopogonidae Ceratopogonidae Ceratopogoninae DipteraDiptera Chironomidae Chironomidae Chironominae Diptera Chironomidae Orthocladiinae Taxonomic classification of benthic Taxonomic macroinvertebrates and counts of individual sites taxa near infor Galves Dickinson Bayou Class Order Family Subfamily Insecta—Cont. Coleoptera— Table 5. Table Texas—Continued
Table 5 13 Total DTH DCK05 ton Bay, ton Bay, QMH DCK05 DTH DCK04 QMH DCK04 DTH DCK03 QMH DCK03 DTH DCK02 Sampling site and habitat type habitat and site Sampling QMH DCK02 DTH DCK01 00 00 0 0 00 9 0 9 00 2002 0 00 0 0 00 0 0 00 0 2 0 0 2 30 00 0 0 00 5 0 8 50 00 0 0 00 0 0 5 90 00 0 0 01 0 0 10 0000001202014 30 0020 0 60 0 0 00 0 0 00 0 3 0 0 8 00 00 0 0 00 5 0 5 32 0 12 0 0 0 0 0 0 0 44 QMH DCK01 (Wiley)30000000003 sp.00000000606 sp.30000000003 (Hungerford) 2 0 0 0 0 0 1 0 0 0 3 s.20000000002 sp. gr. 18 0 10 0 0 0 3 0 0 0 31 g.00000000022 gr. (Serville) 0 6 0 0 0 0 0 0 0 0 6 (McDunnough) 0 0 0 0 0 0 0 0 0 4 4 g.02000000002 gr. sp. 0 18000 0 00 0 0 18 (Dodds) 5 0 0 0 0 0 0 0 0 0 5 sp. 04000000004 sp. 45 0 6 0 0 30 0 0 0 0 81 sp. 80000000008 sp. 02000000002 Genus or sp. 22000000004 sp. 0 11800 0 00 0 0 19 sp. 4 0 10 0 0 0 1 0 0 0 15 sp. 40000000004 sp. 70200000009 sp. 00600000006 sp. 30002000005 scientific name sp. 20000000002 sp. 30000000003 sp. 0 23 0 0 0 0 0 0 0 0 23 sp. 50000000005 sp. 00000000909 sp. 0 2 50 2 0 2 0 0 65 7 128 sp. 0 24000 0 02 0 0 26 sp. 20000000002 sp. 00000000505 (McDunnough) Cricotopus trifascia Gymnometriocnemus Nanocladius Orthocladiinae Parakiefferiella Pseudosmittia Thienemanniella Tvetenia Cricotopus bicinctus Cricotopus/Orthocladius Ablabesmyia Clinotanypus Labrundinia Larsia Tanypus Simuliidae Sciomyzidae Ephemeroptera turbida Acentrella Baetidae Baetis Callibaetis Centroptilum/Procloeon quilleri Fallceon Pseudocloeon dardanum Caenis Hexagenia Hexagenia limbata Trichocorixa Corixidae Rheumatobates hungerfordi Rheumatobates Trepobates Mesovelia cryptophila Mesovelia Microvelia Lepidoptera Zygoptera Coenagrionidae Enallagma Neotrichia canixa Polycentropus Hydroptilidae Cont. Orthocladiinae— Cont. Diptera Chironomidae Tanypodinae Diptera Simuliidae Diptera Sciomyzidae Ephemeroptera Baetidae Ephemeroptera Caenidae Ephemeroptera Ephemeridae Hemiptera Corixidae Corixinae Hemiptera Corixidae HemipteraHemiptera Gerridae Gerridae Rhagodotarsinae Trepobatinae Hemiptera Mesoveliidae HemipteraOdonata VeliidaeOdonata Microveliinae Ceonagrionidae Lepidoptera Trichoptera Hydroptilidae Hydroptilinae Trichoptera Polycentropodidae Polycentropodinae Trichoptera Hydroptilidae Taxonomic classification of benthic Taxonomic macroinvertebrates and counts of individual sites taxa near infor Galves Dickinson Bayou Class Order Family Subfamily Insecta—Cont. Diptera—Cont. Chironomidae— Insecta Ephemeroptera Table 5. Table Texas—Continued
14 Fish, Benthic-Macroinvertebrate, and Stream-Habitat Data From Two Estuaries Near Galveston Bay, Texas, 2000–2001 Total DTH DCK05 ton Bay, ton Bay, QMH DCK05 DTH DCK04 QMH DCK04 DTH DCK03 QMH DCK03 DTH DCK02 Sampling site and habitat type habitat and site Sampling QMH DCK02 DTH DCK01 30 00 0 31 0 00 280 00000178433121183 00 00 0 0 00 9 0 9 00 00 0 0 20 02224 50 4 10 0 3 0 25 0 6 0 98 71 35 45 4 13 25 24 15 39 22 131 72 16 2 1 0 17 0 19 65 40 232 219123 58 115 74 324 0 0 5 0 818 0 357 7 8 0 28 117 0 1,890 20 383 QMH 1,709 738 2,558 9 56 1,937 855 61 1,976 568 10,467 DCK01 (Hartman) 0 0 0 0 0 0 24 1 0 66 91 (Hartman) 18 0 18 0 0 5 0 4 5 4 54 Genus or scientific name Naididae Tubificidae ambiseta Mediomastus Nereididae Spionidae Hobsonia florida Turbellaria Nemertea Enchytraeidae Nematoda Taxonomic classification of benthic Taxonomic macroinvertebrates and counts of individual sites taxa near infor Galves Dickinson Bayou Class Order Family Subfamily individuals species OligochaetaOligochaeta TubificidaPolychaeta Tubificida Naididae Capitellida Tubificidae Capitellidae Polychaeta Phyllodocida Nereididae Polychaeta Spionida Spionidae PolychaetaTurbellaria Terebellida Ampharetidae Total numberTotal of numberTotal of Nemertea Oligochaeta Enchytraeida Enchytraeidae Nematoda Table 5. Table Texas—Continued
Table 5 15 -5 34.76" 13.46" ' ' 3.0 27 ° °00 -4 22.55" 29 50.16" 95 ' ' 1.2 27 ° °02 -4 18.47" 29 43.64" 95 ' ' 3.3 27 S, microsiemens per centimeter at centimeter per S, microsiemens ° °03 µ -4 25.87" 29 47.41" 95 ' ' 3.5 26 ° °04 -3 28.97" 29 37.06" 95 1.5 ' ' 25 ° °07 Sampling site Sampling -4 50.98" 29 27.56" 95 ' ' 7.2 34 ° °05 -4 48.62" 29 04.85" 95 ' ' 1.1 34 ° °06 "29 "95 -3 '18.52 '58.97 1.4 35 04 ° ° -4 38.21" 29 49.28" 95 ' ' 3.1 36 05 ° ° 29 95 -6 (1) (1) ARM01 ARM02 ARM03 HRSP01 HRSP02 DCK01 DCK02 DCK03 DCK04 DCK05 C, degrees Celsius]C, degrees ° Fish, Benthic-Macroinvertebrate, and Stream- and Benthic-Macroinvertebrate, Fish, Estuaries Near Two Habitat Data From 2000–2001 Texas, Bay, Galveston Table 6 S) -- 488 8,600 897 889 23,900 616 12,300 702 3,460 C) -- 16.1 24.0 17.5 19.0 29.8 13.3 22.3 15.5 17.4 µ ° Data collected Physical-habitat datastream for reaches at sites Texas in Armand and Dickinson near Galveston Bayous Bay, Globalpositioning system coordinatescould not be obtaineddetermine to latitude and longitude because of denseground cover. 1 Table 6 Longitude Latitude Linear reachlength (m)Curvilinear reach length (m)Sinuosity slopeReach 67.7 66.1 530 317 615 427 1.02 9.1 207 202 1.67 276 196 1.44 1.02 104 92.4 1.41 305 294 308 295 1.13 1.04 488 457 1,320 1.04 942 1.07 1.40 ubro te btutos00 23910 00000 banks00000 obstructions00000 03200 00000 14000 00000 00000 snags other stumps102400 undercut bars of of of of of Downstreamreach boundary coordinates Number Number Number Structure indexNumber Number Mean right bankslope Mean left bank slopeMean bank slopeMean channel width (m) .005(m) height bank right Mean (m) height bank left Mean .283 0Mean bank height/channel width ratio .468Mean wetted channel width (m) 24.3 .180 .152 3.87Mean depth (m) .376 .156Mean velocity(m/s) .115 3.53 3.35Dissolved oxygen (mg/L) 39.0 .044 .092 3.53 .168pH (standard units) 0 .022 3.63 ( Conductance 31.7 190 .113Temperature ( .011 2.33 .033 .101 1.98 0 3.35 52.4 -- .211 .072 3.14 .109 .30 .107 .375 4.45 32.3 -- 0 27.9 .145 4.30 8.4 .250 .293 .79 .009 3.81 .257 20.5 7.7 11.6 .244 20.9 .147 2.96 -- .010 .20 .254 .231 3.20 180 46.6 9.7 .186 .126 6.10 8.8 .011 .238 -- 0 .184 5.64 11.9 63.4 10.0 .069 .099 6.22 7.4 .001 .185 .152 -- 6.34 0 32.9 57.9 .044 .086 4.97 0 7.5 .111 .9 .045 4.97 54.6 -- 198 .022 -- 4.42 .045 7.5 7.1 4.11 54.3 1.3 .005 7.5 4.0 1.2 .113 7.4 5.2 -- 1.2 7.3 4.0 .85 -- 7.8 Table 6. Table milligrams mg/L, liter; per index; data; no meters; m/s,environmental --, meterssecond;and[m, per RCE, riparian, channel, 25 degrees Celsius; Celsius; degrees 25
16 Fish, Benthic-Macroinvertebrate, and Stream- Habitat Data From Two Estuaries Near Galveston Bay, Texas, 2000–2001