DOCSLIB.ORG

Outfall Benthic Monitoring Interpretive Report: 1992–2007 Results

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Outfall Benthic Monitoring Interpretive Report: 1992–2007 Results Outfall Benthic Monitoring Interpretive Report: 1992–2007 Results Massachusetts Water Resources Authority Environmental Quality Department Report 2008-20 Citation: Maciolek NJ, Doner SA, Dahlen DT, Diaz RJ, Hecker B, Hunt C, Smith WK. 2008. Outfall benthic monitoring interpretive report: 1992–2007 results. Boston: Massachusetts Water Resources Authority. Report 2008-20. 149 pages plus appendices. Outfall benthic monitoring interpretive report: 1992–2007 results Submitted to Massachusetts Water Resources Authority Environmental Quality Department 100 First Avenue Charleston Navy Yard Boston, MA 02129 (617) 242-6000 prepared by Nancy J. Maciolek1 Stacy A. Doner1 Deirdre Dahlen3 Robert J. Diaz2 Barbara Hecker4 Carlton Hunt3 Woollcott Smith5 1ENSR Marine & Coastal Center 89 Water Street Woods Hole, MA 02543 2Diaz and Daughters 6198 Driftwood Lane Ware Neck, VA 23178 3Battelle 397 Washington Street Duxbury, MA 02332 4Hecker Environmental 26 Mullen Way Falmouth, MA 02540 5Consultant/Temple University Report No. 2008-20 October 31, 2008 Outfall Benthic Monitoring Interpretive Report: 1992–2007 Results October 2008 TABLE OF CONTENTS EXECUTIVE SUMMARY ...................................................................................................................................... VI 1. INTRODUCTION .......................................................................................................................................... 1-1 1.1 BACKGROUND .......................................................................................................................................... 1-1 1.2 DESIGN OF THE BENTHIC MONITORING PROGRAM ............................................................................... 1-2 2. 2007 FIELD OPERATIONS .......................................................................................................................... 2-1 2.1 SAMPLING DESIGN .................................................................................................................................... 2-1 2.1.1 Soft Bottom .......................................................................................................................................... 2-1 Sediment Profile Images— .............................................................................................................................. 2-1 2.1.2 Hard Bottom ........................................................................................................................................ 2-1 2.2 FIELD PROGRAM RESULTS ........................................................................................................................ 2-1 2.2.1 Vessel and Navigation......................................................................................................................... 2-1 2.2.2 Grab Sampling .................................................................................................................................... 2-7 2.2.3 Sediment Profile Imagery (SPI) ......................................................................................................... 2-8 2.2.4 Hard-Bottom Sampling ....................................................................................................................... 2-8 3. 2007 CHEMISTRY ......................................................................................................................................... 3-1 3.1 STATUS OF THE BAY ................................................................................................................................. 3-1 3.2 METHODS ................................................................................................................................................. 3-1 3.2.1 Grain Size, Total Organic Carbon, and Clostridium perfringens ..................................................... 3-2 3.2.2 Anthropogenic Contaminants............................................................................................................. 3-2 3.2.3 Data Analyses ...................................................................................................................................... 3-2 3.3 RESULTS AND DISCUSSION ....................................................................................................................... 3-3 3.3.1 Sediment Grain Size and Total Organic Carbon ............................................................................... 3-3 3.3.2 Anthropogenic Contaminants............................................................................................................. 3-7 3.3.3 Sewage Tracer Clostridium perfringens .......................................................................................... 3-11 3.3.4 Sediment Correlations ...................................................................................................................... 3-14 3.3.5 Sediment Quality ............................................................................................................................... 3-16 3.4 MONITORING QUESTIONS ....................................................................................................................... 3-18 3.4.1 Conclusions ....................................................................................................................................... 3-19 4. 2007 SEDIMENT PROFILE IMAGING ...................................................................................................... 4-1 4.1 STATUS OF THE BAY ................................................................................................................................. 4-1 4.2 METHODS ................................................................................................................................................. 4-8 4.2.1 Image Analysis .................................................................................................................................... 4-8 4.2.2 Statistical Analysis .............................................................................................................................. 4-8 4.3 RESULTS AND DISCUSSION ....................................................................................................................... 4-8 4.3.1 Summary of 2007 SPI Data ................................................................................................................ 4-8 4.3.2 Comparison of Pre-and Post-Diversion Results .............................................................................. 4-15 4.3.3 Spatial and Temporal Patterns ......................................................................................................... 4-16 4.4 MONITORING QUESTION ......................................................................................................................... 4-20 5. 2006 SOFT-BOTTOM BENTHIC INFAUNAL COMMUNITIES ............................................................ 5-1 5.1 STATUS OF THE BAY ................................................................................................................................ 5-1 5.1.1 Monitoring Program ........................................................................................................................... 5-1 5.1.2 Benthic Communities.......................................................................................................................... 5-1 5.2 METHODS ................................................................................................................................................ 5-2 5.2.1 Laboratory Analyses ........................................................................................................................... 5-2 5.2.2 Data Analyses ...................................................................................................................................... 5-2 5.3 RESULTS AND DISCUSSION ...................................................................................................................... 5-6 5.3.1 Species Composition of 2007 Samples ............................................................................................... 5-6 5.3.2 Benthic Community Analysis for 2007: Nearfield ............................................................................. 5-6 i Outfall Benthic Monitoring Interpretive Report: 1992–2007 Results October 2008 5.3.3 Benthic Community Analysis for 2007: Farfield ............................................................................. 5-11 5.3.4 Multivariate Analysis of 2007 Samples ............................................................................................ 5-18 5.3.5 Multivariate Analysis of the 1992–2007 Nearfield Samples ............................................................ 5-23 5.3.6 Statistical Analysis ............................................................................................................................ 5-29 5.4 MONITORING QUESTIONS ..................................................................................................................... 5-34 6. 2007 HARD-BOTTOM BENTHIC HABITATS AND FAUNA ................................................................. 6-1 6.1 STATUS OF THE NEARFIELD HARD-BOTTOM ENVIRONMENT .................................................................... 6-1 6.2 METHODS ................................................................................................................................................. 6-2 6.2.1 Visual Analysis ...................................................................................................................................
Load more

Recommended publications
  • Polychaetes of the Western Black Sea Meiobenthos
    J. Black Sea/Mediterranean Environment Vol. 15: 109- 121 (2009) Meiobenthic bristle worms (Polychaeta) of the western Black Sea shelf Ludmila V. Vorobyova* and Olena S. Bondarenko *Odessa Branch, A.O. Kovalevsky Institute of Biology of the Southern Seas (OB IBSS), National Academy of Sciences of Ukraine. 37 Pushkinskaya Street, 65125 Odessa. Abstract The species composition, frequency and quantitative distribution of polychaetes (larvae, adult forms) which in size belong to meiobenthos have been studied. Thirty four species of polychaetes, six of which belong to eumeiobenthos have been discovered. In species composition the Bulgarian shelf (33 species) differs significantly from the Romanian (22 species) and Ukrainian (21 species). The mean density of assemblages is higher on the Bulgarian shelf. Maximum indices of abundance occur at a 15 m depth. Keywords: Black Sea, western shelf, meiobenthos, polychaetes, eumeiobenthos, pseudomeiobenthos. Introduction The western Black Sea shelf (WBS) is of special interest for ecological research. Very diverse environmental conditions from the Dnieper-Bug area to Burgas Bay related to the level of impact of river runoff of the Dnieper, Dniester and Danube are observed. The dynamics of hydrological and hydrochemical parameters determine the marked variability of characteristics of sea bottom invertebrates. The present day state of meiobenthic polychaetes was analyzed. Small (up to 2-5 mm) meiobenthic invertebrates of different water bodies have been described by Mare 1942, Hulings and Gray 1971. The term meiobenthos in scientific literature has been introduced much later than the terms benthos and plankton. The former was proposed by Peterson in 1911 *Corresponding author: [email protected] 109 and the latter by Hensen in 1887.
    [Show full text]
  • Identification Guide to the Planktonic Polychaete Larvae Around the Island of Helgoland (German Bight)
    HELGOL.~NDER MEERESUNTERSUCHUNGEN Helgol/inder Meeresunters. 48, 1-58 (1994) Identification guide to the planktonic polychaete larvae around the island of Helgoland (German Bight) S. Plate* & E. Husemann* * Biologische Anstalt Helgoland (Meeresstation); D-27483 Helgoland, Federal Republic of Germany ABSTRACT: The purpose of this work is to provide the means of identifying the planktonic larvae of the polychaete species appearing in the plankton around the island of Helgoland (North Sea). During a three-year survey in this area, the larvae of 54 species out of 24 families belonging to the orders Orbiniida, Spionida, Capitelhda, Phyllodocida, Oweniida, Terebelhda, Sabelhda and the former Archiannelida have been recorded. Illustrated keys to the families, genera and species are presented. To facilitate the identification, additional descriptions and information about the seasonal appearance of the species are given. INTRODUCTION More than 13 000 species of polychaetous annelids take part in the marine benthos communities worldwide. Their distribution, species composition and population density are monitored within various benthos surveys. For the North Sea, especially the German Bight and the Wadden Sea, much information about the benthic polychaete fauna is available (Caspers, 1950; Stripp, 1969; DSrjes, 1977; Rachor & Gerlach, 1978; Gillandt, 1979; Salzwedel et al., 1985; Rachor, 1990; Bosselmann, 1991; Kr6ncke, 1991). In contrast, the holoplanktonic polychaete species and the meroplanktonic polychaete larvae, which are only part of the plankton during a more or less expanded phase of their ontogenesis, have never received much attention. Meroplanktonic polychaete larvae are seldomly recorded during studies monitoring the North Sea plankton (Smidt, 1951; Giere, 1968; Fransz, 1981; Bosselmann, 1989; Belgrano et al., 1990).
    [Show full text]
  • First Insight on the Mucus of the Annelid Myxicola Infundibulum (Polychaeta, Sabellidae) As a Potential Prospect for Drug Discovery
    marine drugs Article First Insight on the Mucus of the Annelid Myxicola infundibulum (Polychaeta, Sabellidae) as a Potential Prospect for Drug Discovery Loredana Stabili 1,2,*, Margherita Licciano 2, Adriana Giangrande 2, Carmela Gerardi 3, Sandra Angelica De Pascali 2 and Francesco Paolo Fanizzi 2 1 Istituto di Ricerca sulle Acque, Sede Secondaria Talassografico di Taranto, CNR, Via Roma 3, 74123 Taranto, Italy 2 Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Via Prov.le Lecce Monteroni, 73100 Lecce, Italy 3 Istituto di Scienze delle Produzioni Alimentari, U.O.S. di Lecce, via Prov.le Lecce-Monteroni, 73100 Lecce, Italy * Correspondence: [email protected]; Tel.: +39-0832-298-971 Received: 17 May 2019; Accepted: 2 July 2019; Published: 5 July 2019 Abstract: Many marine organisms, including invertebrates, produce mucosal matrices having different functions. Besides mechanical protection, the mucus of many invertebrates contains specific compounds to make the animal poisonous and/or distasteful or irritating. The presence of antibiotic molecules is more advantageous for some invertebrates to contrast bacterial attack. In the present study we investigated the mucus of the Mediterranean annelid species Myxicola infundibulum living in a gelatinous envelope made up of dense mucus. Antimicrobial lysozyme-like and antioxidant activities were investigated to highlight the potential interest of the worm mucus as a source of bioactive compounds for biotechnological applications. In order to understand which kind of compounds could be responsible for the detected activities, the mucus of M. infundibulum was chemically characterized in terms of elemental composition, protein, lipid and carbohydrate content. Further chemical characterization was achieved by the advanced analytical technique of multinuclear and multidimensional NMR spectroscopy.
    [Show full text]
  • Giant Pelagic Larvae of Phyllodocidae (Polychaeta, Annelida)
    JOURNAL OF MORPHOLOGY 238:93-107 (1998) Giant Pelagic Larvae of Phyllodocidae (Polychaeta, Annelida) ALEXANDER B. TZETLIN* Department of Invertebrate Zoology, Biological Faculty, Moscow State University, Moscow, Russia ABSTRACT The microscopic anatomy of giant pelagic larvae of Phyllodoci- dae was studied using routine histological, SEM, and TEM techniques. The larvae consist of two distinct regions: a large spherical trochophore measuring up to 2 mm in diameter and a posterior, long (up to 10 mm length), narrow rudiment of the adult body with up to 120 segments. The larvae have an unusual mixture of larval and adult features, including a very complex, well- developed brain and ganglia in the ventral nerve cord, and only a single pair of protonephridia located in the hyposphere of the trochophore. A muscular pharynx is not developed. The intestinal wall, especially in the trochophore region, consists of endodermal cells containing considerable nutritive mate- rial in the form of yolk-like globular inclusions. The digestive tract of all larvae was empty. The position of the frontal sensory organ and the pro- totroch, the structure of the parapodia and setae, and the three pairs of tentacular cirri dictate inclusion of the larvae in the family Phyllodocidae. The relatively enormous size and unusual pattern of development of the adult body may be adaptations for a long pelagic life and rapid settlement of the species, which inhabits slopes of islands and underwater mounts located far apart. J. Morphol. 238:93-107, 1998. o 1998 Wiley-Liss, Inc. KEY WORDS: pelagic larvae; Phyllodocidae; Polychaeta, Annelida The Phyllodocidae is a large family of lin, '86; Bartolomaeus, '87, '89, '94; Smith polychaetes including both benthic and pe- and Ruppert, '88; Smith, '92), but only a few lagic forms, traditionally considered as a species have been investigated: Phyllodoce group that has retained some archaic charac- mucosa, P maculata, P fragilis, Eulalia viri- ters (Ushakov, '72; Pleijel, '91; Eibye-Jacob- dis, Eteone longa, and finally Lopadorhyn- sen, '93).
    [Show full text]
  • Polychaeta) from the North Sea
    - 46 - NOTES ON SOME PROBLEMS IN THE DETERMINATION OF PHYLLODOCIDAE (POLYCHAETA) FROM THE NORTH SEA Danny Eibye-Jacobsen Zoological Museum, Copenhagen, Denmark During the course of the workshop held by the Benthos Ecology Working Group of ICES on Helgoland 8-12 February I9 8 8, several problems in the determination of the phyllodocids have become apparent. Given the present status of the literature, several of these could be anticipated, while others were somewhat unexpected. Here, an attempt will be made to give some simple guidelines on what, in my opinion, are the solutions to these problems. Eteone : In most of the relevant literature, the species E. lactea and E. spetsbergensis are reported from North Sea waters, E. lactea seems to be a Mediterranean species that does not occur at our latitudes. Likewise, E. spetsbergensis is an Arctic species, that also does not appear to be present in the North Sea area. What we in fact have is, in my opinion, following the suggestion made by Eliason (1962), E. foliosa, originally described from the Atlantic coast of France. This conclusion is based primarly on details of the proboscis. E. foliosa differs from all other species of Eteone present in the North Sea in the relative length of the tentacular cirri (ventral cirri clearly longest) and in the usual absence of setae on segment 2 (one or two setae may be present on small animals, while other species of Eteone from this area have at least four per parapodium on this segment). Eteone flava and E. longa are easily confused, as current keys primarily use the relative length of the dorsal cirri and of the prostomium for distinction.
    [Show full text]
  • Inventory of Marine Fauna in Frenchman Bay and Blue Hill Bay, Maine 1926-1932
    INVENTORY OF MARINE FAUNA IN FRENCHMAN BAY AND BLUE HILL BAY, MAINE 1926-1932 **** CATALOG OF WILLIAM PROCTER’S MARINE COLLECTIONS By: Glen Mittelhauser & Darrin Kelly Maine Natural History Observatory 2007 1 INVENTORY OF MARINE FAUNA IN FRENCHMAN BAY AND BLUE HILL BAY, MAINE 1926-1932 **** CATALOG OF WILLIAM PROCTER’S MARINE COLLECTIONS By: Glen Mittelhauser & Darrin Kelly Maine Natural History Observatory 2007 Catalog prepared by: Glen H. Mittelhauser Specimens cataloged by: Darrin Kelly Glen Mittelhauser Kit Sheehan Taxonomy assistance: Glen Mittelhauser, Maine Natural History Observatory Anne Favolise, Humboldt Field Research Institute Thomas Trott, Gerhard Pohle P.G. Ross 2 William Procter started work on the survey of the marine fauna of the Mount Desert Island region in the spring of 1926 after a summer’s spotting of the territory with a hand dredge. This work was continued from the last week in June until the first week of September through 1932. The specimens from this collection effort were brought back to Mount Desert Island recently. Although Procter noted that this inventorywas not intended to generate a complete list of all species recorded from the Mount Desert Island area, this inventory is the foundation on which all future work on the marine fauna in the region will build. An inven- tory of this magnitude has not been replicated in the region to date. This publication is the result of a major recovery effort for the collection initiated and funded by Acadia National Park. Many of the specimens in this collection were loosing preservative or were already dried out. Over a two year effort, Maine Natural History Observatory worked closely with Acadia National Park to re-house the collection in archival containers, re-hydrate specimens (through stepped concentrations of ethyl alcohol) that had dried, fully catalog the collection, and update the synonymy of specimens.
    [Show full text]
  • Appendix 22C - Sizewell Benthic Ecology Characterisation
    The Sizewell C Project 6.3 Volume 2 Main Development Site Chapter 22 Marine Ecology and Fisheries Appendix 22C - Sizewell Benthic Ecology Characterisation Revision: 1.0 Applicable Regulation: Regulation 5(2)(a) PINS Reference Number: EN010012 May 2020 Planning Act 2008 Infrastructure Planning (Applications: Prescribed Forms and Procedure) Regulations 2009 Sizewell benthic ecology characterisation TR348 Sizewell benthic ecology NOT PROTECTIVELY MARKED Page 1 of 122 characterisation TR348 Sizewell benthic ecology NOT PROTECTIVELY MARKED Page 2 of 122 characterisation Table of contents Executive summary ................................................................................................................................. 10 1 Context ............................................................................................................................................... 13 1.1 Purpose of the report................................................................................................................ 13 1.2 Thematic coverage ................................................................................................................... 13 1.3 Geographic coverage ............................................................................................................... 14 1.4 Data and information sources ................................................................................................... 17 1.4.1 BEEMS intertidal survey .................................................................................................
    [Show full text]
  • Dominant Species of Polychaetous Annelids of Georges Bank
    MARINE ECOLOGY PROGRESS SERIES Vol. 3: 135-144, 1980 - Published August 31 Mar. Ecol. Prog. Ser. Dominant Species of Polychaetous Annelids of Georges Bank D. Maurer and W. Leathem University of Delaware, College of Marine Studies, Lewes, Delaware 19958, USA ABSTRACT: During the course of a study of polychaetous annelids of Georges Bank, USA, 333 taxa of polychaetes (winter, 263; spring, 264) belonging to 46 families (winter, 30; spring, 33) were identified. The top taxa in terms of abundance accounted for a mean of 88 '10 (winter) and 89.3 "h, (spring) of the number of polychaetes per station. Based on density and frequency of occurrence, the top taxa for winter were Spiophanes bombyx, Exogone hebes, Euclymene collaris, Exogone verugera, Arcidea catherinae, Phyllodoce mucosa, Cirratulidae spp., Parapionosyllis longicirrata, Schistomeringos caeca, Spiophanes kroyeri, Sphaerosyllis erinaceus, Tharyx sp. B, Goniadella gracilis, Sabellidae spp.. and Jasmineira filiformis. In the spring, Chone infundibuliformis, Maldanidae spp., Nephtyidae spp., Notomastus latericeus, and Euchone incolor were among the top taxa which included 10 taxa from the winter. Ten species were selected and quantitatively examined for their distribution and ecological relationships with environmental variables. These dominant species are an important component of macrobenthic infauna from Georges Bank to Chesapeake Bay. Approximately 15 families of polychaetes are important taxa for the continental shelves ranging from California to Alaska and Chesapeake Bay to Georges Bank. INTRODUCTION tionships were independently confirmed through prin- cipal component analyses, which indicated that per- During an earlier account, the general ecological cent gravel and depth were very important factors distribution of polychaetous annelids of Georges Bank influencing the ecology of Georges Bank polychaetes.
    [Show full text]
  • Distribution and Mobility of Juvenile Polychaeta in a Sedimentary Tidal Environment
    Distribution and Mobility of Juvenile Polychaeta in a Sedimentary Tidal Environment Verbreitung und Mobilitäjuveniler Polychaeten in sandigen Watten Norma Angelica Hernandez-Guevara Ber. Polarforsch. Meeresforsch. 502 (2005) ISSN 1618 - 3193 Norrna Angklica Hernandez-Guevara Wattenmeerstation Sylt Alfred-Wegener-Institut füPolar- und Meeresforschung Hafenstr. 43 25992 LisUSyIt Germany Die vorliegende Arbeit ist die inhaltlich unverändert Fassung einer Dissertation, die 2004 im Fachbereich Zoologie der UniversitäKiel vorgelegt wurde. Contents Zusammenfassung Summary 1. General Introduction 2. Abundance and distribution of juvenile and adult polychaetes: are tidal flats nursery habitats? 11 3. Small-scale dispersion of juvenile polychaetes: indirect evidence of benthic mobility 4. Nobility of marine benthic invertebrates: an experimental approach with juvenile polychaetes On a sandy tidal flat 7 2 5. Final discussion 89 References 96 Acknowledgments 105 Es wird traditionell angenommenI dass die räumlich Verteilung benthischer Populationen hauptsächlic von pre-settlement (vor der Ansiedlung) Prozessen bestimmt wird. Doch häufe sich die Indizienl dass auch viele post-setflement (nach der Ansiedlung) Prozesse eine wichtige Rolle spielen können In dieser Studie wurde die Ausbreitung juveniler Stadien nach der Ansiedlung als ein mögliche Schlüsselereigni fü Verteilungsmuster von Adultpopulationen untersucht. Da Borstenwürme (Polychaeten) eine der vielfältigste und zahlreichsten Tiergruppen in marinen Weichböde sindl wurden sie als Beispiel herangezogen. Zuerst wurden Verteilungsmuster von juvenilen und adulten Polychaeten im Sylter Wattenmeer verglichen. Eine Beprobung erfolgte in fün Habitaten: Sandwatten! Seegraswiesen! Schli~kgrasbulten~Muschelschillfeldern und MiesmuschelbänkenInsgesamt wurden 43 Polychaetenarten bestimmt. Acht Arten trugen mit mehr als 90Y0 zu der Gesamtabundanz bei (Scoloplos armigec wgospio elegansl Nereis virensI Capitella capitatal Microphthalmus sP.
    [Show full text]
  • Effect of an Engineer Species on the Diversity and Functioning of Benthic Communities: the Sabellaria Alveolata Reef Habitat
    Effect of an engineer species on the diversity and functioning of benthic communities : the Sabellaria Alveolata reef habitat Auriane Jones To cite this version: Auriane Jones. Effect of an engineer species on the diversity and functioning of benthic communities : the Sabellaria Alveolata reef habitat. Ecology, environment. Université de Bretagne occidentale - Brest, 2017. English. <NNT : 2017BRES0142>. <tel-01801202> HAL Id: tel-01801202 https://tel.archives-ouvertes.fr/tel-01801202 Submitted on 28 May 2018 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Thèse préparée à l'Université de Bretagne Occidentale pour obtenir le diplôme de DOCTEUR délivré de façon partagée par L'Université de Bretagne Occidentale et l'Université de Bretagne Loire présentée par Spécialité: Ecologie marine Auriane Jones École Doctorale Sciences de la Mer et du Littoral Thèse soutenue le 14 décembre 2017 Effect of an engineer devant le jury composé de: species on the diversity Erik BONSDORFF Professor of marine biology, Åbo Akademi University / Rapporteur and functioning
    [Show full text]
  • Polychaete Patterns from an Oceanic Island in the Eastern Central Atlantic: La Gomera (Canary Archipelago)
    Cah. Biol. Mar. (2001) 42 : 275-287 Polychaete patterns from an oceanic island in the eastern Central Atlantic: La Gomera (Canary Archipelago) Salvador HERRANDO-PÉREZ1, Guillermo SAN MARTÍN2 and Jorge NÚÑEZ1 1Departamento de Biología Animal (Zoología), Universidad de La Laguna, 38206 La Laguna, Spain, fax number (34) 922 318311 E-mail: [email protected] and : [email protected] 2Departamento de Biología (Zoología), Universidad Autónoma de Madrid, 28049 Madrid, Spain, fax number (34) 91 3978344 E-mail : [email protected] Abstract: The polychaete macrofauna along the shallow sublittoral of La Gomera (Canary Islands, eastern Central Atlantic) was surveyed during the summer 1995 with a 0.01 m2 van Veen grab. Sampling resulted in a moderate number of specimens per sample unit, which influenced the assessment of α and β diversity. Diversity patterns followed sediment and hydrographic gradients between the north of the island (coarse sandy bottoms directly exposed to the open ocean), and the south (sheltered fine sandy bottoms). Of the 81 taxa recorded, two species were new to science, while a further 24 species were cited for the first time from the Canaries. Spionids (46% of faunal density), syllids (14 species) and onuphids were locally well represented and their distribution responded to life history features and sediment types. Polychaetes with a wide biogeographic range and relying on meroplanktonic phases, for dispersal, predominated. Factors controlling the access of polychaete populations to oceanic islands are discussed, including the role of major surface oceanic currents in the dispersion of larvae and reproductive adaptations of species. Résumé : Distribution des Polychètes d’une île de l’Océan Atlantique : La Gomera (Archipel des Îles Canaries).
    [Show full text]
  • Proquest Dissertations
    SINKING FOOD SUPPLY: DOES COMPOSITION, DIVERSITY, OR QUANTITY OF FOOD SUPPLY INFLUENCE MACROINFAUNAL COMMUNITIES? © Michael C. Kelly A thesis submitted to the School of Graduate Studies in partial fulfilment of the requirements for the degree of Master of Science Department of Biology Memorial University of Newfoundland April, 2009 St. John's, Newfoundland Library and Archives Bibliotheque et 1*1 Canada Archives Canada Published Heritage Direction du Branch Patrimoine de I'edition 395 Wellington Street 395, rue Wellington Ottawa ON K1A 0N4 Ottawa ON K1A 0N4 Canada Canada Your file Votre reference ISBN: 978-0-494-55239-1 Our file Notre reference ISBN: 978-0-494-55239-1 NOTICE: AVIS: The author has granted a non­ L'auteur a accorde une licence non exclusive exclusive license allowing Library and permettant a la Bibliotheque et Archives Archives Canada to reproduce, Canada de reproduire, publier, archiver, publish, archive, preserve, conserve, sauvegarder, conserver, transmettre au public communicate to the public by par telecommunication ou par I'lntemet, preter, telecommunication or on the Internet, distribuer et vendre des theses partout dans le loan, distribute and sell theses monde, a des fins commerciales ou autres, sur worldwide, for commercial or non­ support microforme, papier, electronique et/ou commercial purposes, in microform, autres formats. paper, electronic and/or any other formats. The author retains copyright L'auteur conserve la propriete du droit d'auteur ownership and moral rights in this et des droits moraux qui protege cette these. Ni thesis. Neither the thesis nor la these ni des extraits substantiels de celle-ci substantial extracts from it may be ne doivent etre imprimes ou autrement printed or otherwise reproduced reproduits sans son autorisation.
    [Show full text]