Final Report

Total Page:16

File Type:pdf, Size:1020Kb

Final Report Investigation of hard-bottom habitats (Anthozoa and their taxonomy) in Boka Kotorska Bay Final report MONTENEGRO MINISTRY OF SUSTAINABLE DEVELOPMENT AND TOURISM Author: Egidio Trainito Editing: Cover design: swim2birds.co.uk Graphic design: Ljudomat Cover photos: Clockwise from top left Savalia savaglia, Polycyathus muellerae, Leptogorgia sarmentosa, Spinimuricea klavereni (Egidio Trainito) This study is prepared within the GEF Adriatic Project and supported by the Global Environment Facility (GEF). For bibliographical purposes this document may be cited as: UNEP/MAP-PAP/RAC-SPA/RAC and MSDT (2019). Investigation of hard bottom habitats with special attention given to Anthozoa and their taxonomy in Boka Kotorska Bay, Montenegro. By: Egidio Trainito. Ed: PAP/RAC – GEF Adriatic project. 67pp Acknowledgments The author of this report wishes to thank first the researchers the IBM of Kotor that collaborated to the design and the realization of the monitoring and the laboratory activities: Vesna Mačić, Slavica Petović and Nikola Đorđević. Particular thanks are debt to: Brano Lazarević and Pina Contis for the support in diving activities and terrestrial documentation; Francesca Riolo and Rossella Baldacconi for the help in the determination of Scleractinia samples; Martina Canessa for the discussion and help on GES indexes and on MAES Index. Investigation of hard-bottom habitats (Anthozoa and their taxonomy) in Boka Kotorska Bay Table of contents 1 Framework ....................................................................................................................................................................................................................................... 1 1.1 Scope of the work ......................................................................................................................................................................................................................................... 1 1.2 Study area ..................................................................................................................................................................................................................................................... 1 2 Coralligenous Communities: A Clarification on Definitions ................................................................................................................................................................. 3 3 Methods .......................................................................................................................................................................................................................................... 5 3.1 Literature ...................................................................................................................................................................................................................................................... 5 3.2 Field work ..................................................................................................................................................................................................................................................... 5 3.3 Laboratory work ............................................................................................................................................................................................................................................ 5 3.4 Photography and video rendering ................................................................................................................................................................................................................. 6 3.5 Methodology for GES assessment ................................................................................................................................................................................................................. 6 4 Field Work Results ............................................................................................................................................................................................................................ 8 4.1 Drazin vrt ....................................................................................................................................................................................................................................................... 8 4.1.1 Geographical and operational framework ................................................................................................................................................................................... 8 4.1.2 Megabenthic assemblages ........................................................................................................................................................................................................ 10 4.1.3 Biodiversity ................................................................................................................................................................................................................................ 18 4.1.4 Debris ........................................................................................................................................................................................................................................ 19 4.1.5 MAES index ............................................................................................................................................................................................................................... 20 4.2 Sopot .......................................................................................................................................................................................................................................................... 20 4.2.1 Geographical and operational framework ................................................................................................................................................................................. 20 4.2.2 Megabenthic assemblages ........................................................................................................................................................................................................ 23 4.2.3 Biodiversity ................................................................................................................................................................................................................................ 28 4.2.4 Debris ........................................................................................................................................................................................................................................ 30 4.2.5 MAES index ............................................................................................................................................................................................................................... 34 4.3 Turski rt ....................................................................................................................................................................................................................................................... 35 4.3.1 Geographical and operational framework ................................................................................................................................................................................. 35 4.3.2 Megabethic assemblages .......................................................................................................................................................................................................... 37 4.3.3 Biodiversity ................................................................................................................................................................................................................................ 42 4.3.4 Debris ........................................................................................................................................................................................................................................ 43 4.3.5 MAES Index ............................................................................................................................................................................................................................... 47 5 Laboratory Work Results ................................................................................................................................................................................................................. 48 5.1 Scleractinia .................................................................................................................................................................................................................................................. 48 5.2 Spinimuricea klavereni ................................................................................................................................................................................................................................... 52 5.3 Alcyonium palmatum ....................................................................................................................................................................................................................................
Recommended publications
  • Octocoral Diversity of Balıkçı Island, the Marmara Sea
    J. Black Sea/Mediterranean Environment Vol. 19, No. 1: 46-57 (2013) RESEARCH ARTICLE Octocoral diversity of Balıkçı Island, the Marmara Sea Eda Nur Topçu1,2*, Bayram Öztürk1,2 1Faculty of Fisheries, Istanbul University, Ordu St., No. 200, 34470, Laleli, Istanbul, TURKEY 2Turkish Marine Research Foundation (TUDAV), P.O. Box: 10, Beykoz, Istanbul, TURKEY *Corresponding author: [email protected] Abstract We investigated the octocoral diversity of Balıkçı Island in the Marmara Sea. Three sites were sampled by diving, from 20 to 45 m deep. Nine species were found, two of which are first records for Turkish fauna: Alcyonium coralloides and Paralcyonium spinulosum. Scientific identification of Alcyonium acaule in the Turkish seas was also done for the first time in this study. Key words: Octocoral, soft coral, gorgonian, diversity, Marmara Sea. Introduction The Marmara Sea is a semi-enclosed sea connecting the Black Sea to the Aegean Sea via the Turkish Straits System, with peculiar oceanographic, ecological and geomorphologic characteristics (Öztürk and Öztürk 1996). The benthic fauna consists of Black Sea species until approximately 20 meters around the Prince Islands area, where Mediterranean species take over due to the two layer stratification in the Marmara Sea. The Sea of Marmara, together with the straits of Istanbul and Çanakkale, serves as an ecological barrier, a biological corridor and an acclimatization zone for the biota of Mediterranean and Black Seas (Öztürk and Öztürk 1996). The Islands in the Sea of Marmara constitute habitats particularly for hard bottom communities of Mediterranean origin. Ten Octocoral species were reported by Demir (1954) from the Marmara Sea but amongst them, Gorgonia flabellum was probably reported by mistake and 46 should not be considered as a valid record from the Sea of Marmara.
    [Show full text]
  • Active and Passive Suspension Feeders in a Coralligenous Community
    ! Chapter_0_Martina 05/06/15 07:23 Página 1 The importance of benthic suspension feeders in the biogeochemical cycles: active and passive suspension feeders in a coralligenous community PhD THESIS Martina Coppari Barcelona, 2015 Chapter_0_Martina 05/06/15 07:23 Página 2 Photos by: Federico Betti, Georgios Tsounis Design: Antonio Secilla Chapter_0_Martina 05/06/15 07:23 Página 3 The importance of benthic suspension feeders in the biogeochemical cycles: active and passive suspension feeders in a coralligenous community PhD THESIS MARTINA COPPARI Universitat Autònoma de Barcelona Institut de Ciència i Tecnologia Ambientals PhD Programme in Environmental Science and Technology June 2015 Director de la Tesi Director de la Tesi Dr. Sergio Rossi Dr. Andrea Gori Investigador Investigador Universitat Autònoma de Barcelona Universitat de Barcelona Institut de Ciència i Tecnologia Ambientals Departament d’Ecologia • 3 • Chapter_0_Martina 05/06/15 07:23 Página 4 . Chapter_0_Martina 05/06/15 07:23 Página 5 Para los que me han acompañado en este viaje • 5 • Chapter_0_Martina 05/06/15 07:23 Página 6 . Chapter_0_Martina 05/06/15 07:23 Página 7 Resumen 11 Abstract 13 Introduction 15 Chapter 1 Size, spatial and bathymetrical distribution of the ascidian Halocynthia papillosa in Mediterranean coastal bottoms: benthic-pelagic implications 29 1. Introduction ......................................................................................................................................................30 2. Materials
    [Show full text]
  • Di Camillo Et Al 2017
    This is a post-peer-review, pre-copyedit version of an article published in Biodiversity and Conservation on 23 December 2017 (First Online). The final authenticated version is available online at: https://doi.org/10.1007/s10531-017-1492-8 https://link.springer.com/article/10.1007%2Fs10531-017-1492-8 An embargo period of 12 months applies to this Journal. This paper has received funding from the European Union (EU)’s H2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 643712 to the project Green Bubbles RISE for sustainable diving (Green Bubbles). This paper reflects only the authors’ view. The Research Executive Agency is not responsible for any use that may be made of the information it contains. © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 AUTHORS' ACCEPTED MANUSCRIPT Building a baseline for habitat-forming corals by a multi-source approach, including Web Ecological Knowledge - Cristina G Di Camillo, Department of Life and Environmental Sciences, Marche Polytechnic University, CoNISMa, Ancona, Italy, [email protected] - Massimo Ponti, Department of Biological, Geological and Environmental Sciences and Interdepartmental Research Centre for Environmental SciencesUniversity of Bologna, CoNISMa, Ravenna, Italy - Giorgio Bavestrello, Department of Earth, Environment and Life Sciences, University of Genoa, CoNISMa, Genoa, Italy - Maja Krzelj, Department of Marine Studies, University of Split, Split, Croatia - Carlo Cerrano, Department of Life and Environmental Sciences, Marche Polytechnic University, CoNISMa, Ancona, Italy Received: 12 January 2017 Revised: 10 December 2017 Accepted: 14 December 2017 First online: 23 December 2017 Cite as: Di Camillo, C.G., Ponti, M., Bavestrello, G.
    [Show full text]
  • Checklist of Fish and Invertebrates Listed in the CITES Appendices
    JOINTS NATURE \=^ CONSERVATION COMMITTEE Checklist of fish and mvertebrates Usted in the CITES appendices JNCC REPORT (SSN0963-«OStl JOINT NATURE CONSERVATION COMMITTEE Report distribution Report Number: No. 238 Contract Number/JNCC project number: F7 1-12-332 Date received: 9 June 1995 Report tide: Checklist of fish and invertebrates listed in the CITES appendices Contract tide: Revised Checklists of CITES species database Contractor: World Conservation Monitoring Centre 219 Huntingdon Road, Cambridge, CB3 ODL Comments: A further fish and invertebrate edition in the Checklist series begun by NCC in 1979, revised and brought up to date with current CITES listings Restrictions: Distribution: JNCC report collection 2 copies Nature Conservancy Council for England, HQ, Library 1 copy Scottish Natural Heritage, HQ, Library 1 copy Countryside Council for Wales, HQ, Library 1 copy A T Smail, Copyright Libraries Agent, 100 Euston Road, London, NWl 2HQ 5 copies British Library, Legal Deposit Office, Boston Spa, Wetherby, West Yorkshire, LS23 7BQ 1 copy Chadwick-Healey Ltd, Cambridge Place, Cambridge, CB2 INR 1 copy BIOSIS UK, Garforth House, 54 Michlegate, York, YOl ILF 1 copy CITES Management and Scientific Authorities of EC Member States total 30 copies CITES Authorities, UK Dependencies total 13 copies CITES Secretariat 5 copies CITES Animals Committee chairman 1 copy European Commission DG Xl/D/2 1 copy World Conservation Monitoring Centre 20 copies TRAFFIC International 5 copies Animal Quarantine Station, Heathrow 1 copy Department of the Environment (GWD) 5 copies Foreign & Commonwealth Office (ESED) 1 copy HM Customs & Excise 3 copies M Bradley Taylor (ACPO) 1 copy ^\(\\ Joint Nature Conservation Committee Report No.
    [Show full text]
  • Ecological Mapping and Data Quality Assessment for the Needs of Ecosystem-Based Marine Spatial Management: Case Study Greek Ionian Sea and the Adjacent Gulfs
    Research Article Mediterranean Marine Science Indexed in WoS (Web of Science, ISI Thomson) and SCOPUS The journal is available on line at http://www.medit-mar-sc.net Ecological mapping and data quality assessment for the needs of ecosystem-based marine spatial management: case study Greek Ionian Sea and the adjacent gulfs Y. ISSARIS1,2, S. KATSANEVAKIS1,3, M. PANTAZI1, V. VASSILOPOULOU1, P. PANAYOTIDIS4, S. KAVADAS1, A. KOKKALI1, M. SALOMIDI4, A. FRANTZIS5, A. PANOU6, D. DAMALAS1,7, D. KLAOUDATOS1, D. SAKELLARIOU4, V. DRAKOPOULOU4, C. KYRIAKIDOU4, I. MAINA1, J. FRIC8, C. SMITH1, S. GIAKOUMI1 and G. KARRIS9 1 Institute of Marine Biological Resources, Hellenic Centre for Marine Research, Ag. Kosmas, Greece 2 Sector of Zoology and Marine Biology, Department of Biology, University of Athens, Zografos, Greece 3 European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra, Italy 4 Institute of Oceanography, Hellenic Centre for Marine Research, Anavyssos, Greece 5 Pelagos Cetacean Research Institute, Vouliagmeni, Greece 6 Archipelagos – environment and development, Kifissia, Greece 7 European Commission, Joint Research Centre, Institute for the Protection and Security of the Citizen, Ispra, Italy 8 Hellenic Ornithological Society, Athens, Greece 9 Department of Environmental Technology and Ecology, TEI of the Ionian Islands, Zakynthos Island, Greece Corresponding author: [email protected] Received: 30 April 2012; Accepted: 2 November 2012; Published on line: 19 November 2012 Abstract Mapping of ecosystem components (natural and socioeconomic) is a prerequisite for ecosystem-based marine spatial manage- ment (EB-MSM). To initiate the process of EB-MSM in the Greek Ionian Sea and the adjacent gulfs, the main relevant ecosystem components were mapped based on existing spatial information and expert judgment.
    [Show full text]
  • Updated Classification of Benthic Marine Habitat Types for The
    Updated Classification of Benthic Marine Habitat Types for the Mediterranean Region TUNISIA - 2019 Legal notice: The designations employed and the presentation of the material in this document do not imply the expression of any opinion whatsoever on the part of the Specially Protected Areas Regional Activity Centre (SPA/RAC) and UN Environment/Mediterranean Action Plan (MAP) and those of the Lebanese Ministry of Environment concerning the legal status of any State, Territory, city or area, or of its authorities, or concerning the delimitation of their frontiers or boundaries. This publication was produced with the fi nancial support of the European Union in the framework of the MedMPA Network Project. Its contents are the sole responsibility of SPA/RAC and do not necessarily refl ect the views of the European Union. Copyright : All property rights of texts and content of different types of this publication belong to SPA/RAC. Reproduction of these texts and contents, in whole or in part, and in any form, is prohibited without prior written permission from SPA/RAC, except for educational and other non-commercial purposes, provided that the source is fully acknowledged. © 2019 - United Nations Environment Programme Mediterranean Action Plan Specially Protected Areas Regional Activity Centre (SPA/RAC) Boulevard du Leader Yasser Arafat B.P. 337 1080 Tunis Cedex - Tunisia. [email protected] For bibliographic purposes, this document may be cited as: SPA/RAC–UN Environment/MAP, 2019: Updated Classifi cation of Benthic Marine Habitat Types for the Mediterranean Region Layout : Atef OUERGHI Cover photos credit: © SPA/RAC, University of Seville, University of Alicante, Trainito E.
    [Show full text]
  • DEEP SEA LEBANON RESULTS of the 2016 EXPEDITION EXPLORING SUBMARINE CANYONS Towards Deep-Sea Conservation in Lebanon Project
    DEEP SEA LEBANON RESULTS OF THE 2016 EXPEDITION EXPLORING SUBMARINE CANYONS Towards Deep-Sea Conservation in Lebanon Project March 2018 DEEP SEA LEBANON RESULTS OF THE 2016 EXPEDITION EXPLORING SUBMARINE CANYONS Towards Deep-Sea Conservation in Lebanon Project Citation: Aguilar, R., García, S., Perry, A.L., Alvarez, H., Blanco, J., Bitar, G. 2018. 2016 Deep-sea Lebanon Expedition: Exploring Submarine Canyons. Oceana, Madrid. 94 p. DOI: 10.31230/osf.io/34cb9 Based on an official request from Lebanon’s Ministry of Environment back in 2013, Oceana has planned and carried out an expedition to survey Lebanese deep-sea canyons and escarpments. Cover: Cerianthus membranaceus © OCEANA All photos are © OCEANA Index 06 Introduction 11 Methods 16 Results 44 Areas 12 Rov surveys 16 Habitat types 44 Tarablus/Batroun 14 Infaunal surveys 16 Coralligenous habitat 44 Jounieh 14 Oceanographic and rhodolith/maërl 45 St. George beds measurements 46 Beirut 19 Sandy bottoms 15 Data analyses 46 Sayniq 15 Collaborations 20 Sandy-muddy bottoms 20 Rocky bottoms 22 Canyon heads 22 Bathyal muds 24 Species 27 Fishes 29 Crustaceans 30 Echinoderms 31 Cnidarians 36 Sponges 38 Molluscs 40 Bryozoans 40 Brachiopods 42 Tunicates 42 Annelids 42 Foraminifera 42 Algae | Deep sea Lebanon OCEANA 47 Human 50 Discussion and 68 Annex 1 85 Annex 2 impacts conclusions 68 Table A1. List of 85 Methodology for 47 Marine litter 51 Main expedition species identified assesing relative 49 Fisheries findings 84 Table A2. List conservation interest of 49 Other observations 52 Key community of threatened types and their species identified survey areas ecological importanc 84 Figure A1.
    [Show full text]
  • Deep‐Sea Coral Taxa in the U.S. Gulf of Mexico: Depth and Geographical Distribution
    Deep‐Sea Coral Taxa in the U.S. Gulf of Mexico: Depth and Geographical Distribution by Peter J. Etnoyer1 and Stephen D. Cairns2 1. NOAA Center for Coastal Monitoring and Assessment, National Centers for Coastal Ocean Science, Charleston, SC 2. National Museum of Natural History, Smithsonian Institution, Washington, DC This annex to the U.S. Gulf of Mexico chapter in “The State of Deep‐Sea Coral Ecosystems of the United States” provides a list of deep‐sea coral taxa in the Phylum Cnidaria, Classes Anthozoa and Hydrozoa, known to occur in the waters of the Gulf of Mexico (Figure 1). Deep‐sea corals are defined as azooxanthellate, heterotrophic coral species occurring in waters 50 m deep or more. Details are provided on the vertical and geographic extent of each species (Table 1). This list is adapted from species lists presented in ʺBiodiversity of the Gulf of Mexicoʺ (Felder & Camp 2009), which inventoried species found throughout the entire Gulf of Mexico including areas outside U.S. waters. Taxonomic names are generally those currently accepted in the World Register of Marine Species (WoRMS), and are arranged by order, and alphabetically within order by suborder (if applicable), family, genus, and species. Data sources (references) listed are those principally used to establish geographic and depth distribution. Only those species found within the U.S. Gulf of Mexico Exclusive Economic Zone are presented here. Information from recent studies that have expanded the known range of species into the U.S. Gulf of Mexico have been included. The total number of species of deep‐sea corals documented for the U.S.
    [Show full text]
  • Marine Invertebrate Diversity in Aristotle's Zoology
    Contributions to Zoology, 76 (2) 103-120 (2007) Marine invertebrate diversity in Aristotle’s zoology Eleni Voultsiadou1, Dimitris Vafi dis2 1 Department of Zoology, School of Biology, Aristotle University of Thessaloniki, GR - 54124 Thessaloniki, Greece, [email protected]; 2 Department of Ichthyology and Aquatic Environment, School of Agricultural Sciences, Uni- versity of Thessaly, 38446 Nea Ionia, Magnesia, Greece, dvafi [email protected] Key words: Animals in antiquity, Greece, Aegean Sea Abstract Introduction The aim of this paper is to bring to light Aristotle’s knowledge Aristotle was the one who created the idea of a general of marine invertebrate diversity as this has been recorded in his scientifi c investigation of living things. Moreover he works 25 centuries ago, and set it against current knowledge. The created the science of biology and the philosophy of analysis of information derived from a thorough study of his biology, while his animal studies profoundly infl uenced zoological writings revealed 866 records related to animals cur- rently classifi ed as marine invertebrates. These records corre- the origins of modern biology (Lennox, 2001a). His sponded to 94 different animal names or descriptive phrases which biological writings, constituting over 25% of the surviv- were assigned to 85 current marine invertebrate taxa, mostly ing Aristotelian corpus, have happily been the subject (58%) at the species level. A detailed, annotated catalogue of all of an increasing amount of attention lately, since both marine anhaima (a = without, haima = blood) appearing in Ar- philosophers and biologists believe that they might help istotle’s zoological works was constructed and several older in the understanding of other important issues of his confusions were clarifi ed.
    [Show full text]
  • Ica Nature Park (Adriatic Sea, Croatia)
    NAT. CROAT. VOL. 16 No 4 233¿266 ZAGREB December 31, 2007 original scientific paper / izvorni znanstveni rad ANTHOZOAN FAUNA OF TELA[]ICA NATURE PARK (ADRIATIC SEA, CROATIA) PETAR KRU@I] Faculty of Science, Department of Zoology, Rooseveltov trg 6, 10000 Zagreb, Croatia ([email protected]) Kru`i}, P.: Anthozoan fauna of Tela{}ica Nature Park (Adriatic Sea, Croatia). Nat. Croat., Vol. 16, No. 4., 233–266, 2007, Zagreb. Sixty-five anthozoan species were recorded and collected in the area of Tela{}ica Nature Park during surveys from 1999 to 2006. General and ecological data are presented for each species, as well as distribution and local abundance. The recorded species account for about 56% of the antho- zoans known in the Adriatic Sea, and for about 38% of the anthozoans known in the Mediterra- nean Sea. From Tela{}ica Nature Park, 16 species are considered to be Mediterranean endemics. The heterogeneity of the substrates and benthic communities in the bay and cliffs is considerable in Tela{}ica Nature Park; anthozoans are present on most of the different kinds of substrates and in a wide range of benthic communities. Key words: marine fauna, Anthozoa, Tela{}ica Nature Park, Adriatic Sea. Kru`i}, P.: Fauna koralja Parka prirode Tela{}ica (Jadransko more, Hrvatska). Nat. Croat., Vol. 16, No. 4., 233–266, 2007, Zagreb. Prilikom istra`ivanja podmorskog dijela Parka prirode Tela{}ica u razdoblju od 1999. do 2006. godine zabilje`eno je i sakupljeno 65 vrsta koralja. Za svaku vrstu izneseni su op}i i ekolo{ki podaci, te su zabilje`eni nalazi i lokalna brojnost.
    [Show full text]
  • The Earliest Diverging Extant Scleractinian Corals Recovered by Mitochondrial Genomes Isabela G
    www.nature.com/scientificreports OPEN The earliest diverging extant scleractinian corals recovered by mitochondrial genomes Isabela G. L. Seiblitz1,2*, Kátia C. C. Capel2, Jarosław Stolarski3, Zheng Bin Randolph Quek4, Danwei Huang4,5 & Marcelo V. Kitahara1,2 Evolutionary reconstructions of scleractinian corals have a discrepant proportion of zooxanthellate reef-building species in relation to their azooxanthellate deep-sea counterparts. In particular, the earliest diverging “Basal” lineage remains poorly studied compared to “Robust” and “Complex” corals. The lack of data from corals other than reef-building species impairs a broader understanding of scleractinian evolution. Here, based on complete mitogenomes, the early onset of azooxanthellate corals is explored focusing on one of the most morphologically distinct families, Micrabaciidae. Sequenced on both Illumina and Sanger platforms, mitogenomes of four micrabaciids range from 19,048 to 19,542 bp and have gene content and order similar to the majority of scleractinians. Phylogenies containing all mitochondrial genes confrm the monophyly of Micrabaciidae as a sister group to the rest of Scleractinia. This topology not only corroborates the hypothesis of a solitary and azooxanthellate ancestor for the order, but also agrees with the unique skeletal microstructure previously found in the family. Moreover, the early-diverging position of micrabaciids followed by gardineriids reinforces the previously observed macromorphological similarities between micrabaciids and Corallimorpharia as
    [Show full text]
  • Structure of Mediterranean 'Cnidarian Populations In
    Homage to Ramon Marga/et,· or, Why there is such p/easure in studying nature 243 (J. D. Ros & N. Prat, eds.). 1991 . Oec% gia aquatica, 10: 243-254 STRUCTURE OF 'CNIDARIAN POPULATIONS IN MEDITERRANEAN SUBLITTORAL BENTHIC COMMUNITIES AS A RESUL T OF ADAPTATION TO DIFFERENT ENVIRONMENTAL CONDITIONS 2 JOSEP-MARIA GILIl & ENRIe BALLESTEROs .• 1 Insti t de Ciencies del Mar (CSIC). Passeig Nacional, s/n. 08039 Barcelona. Spain 2 � Centre d'Estudis Avanc;:atsde Blanes (CSIC). Camí de Santa Barbara, s/n. 17300 Blanes. Spain Received: March 1990 SUMMARY The presence and abundance of Cnidarians, extremely cornmon in Mediterranean sublittoral benthic communities, exerts a profound effect on the entire structure of such communities, although the roles of Anthozoans and Hydrozoans differ in accordance with their different biological characteristics. Structural differences in benthic cnidarian populations were observed in three sublittoral cornmunities located within 100 m of each other yet differing considerably in light intensity and water movement. Species-area and Shannon's diversity-area curves were computed for each community from reticulate samples constituted by 18 subsamples 2 of 289 cm . Species-area curves were fitted to semilogarithmic functions, while diversity-area curves were fitted to Michaelis-Menten functions by the method of least squares. Species richness, species distribution, alpha-diversity, and pattem diversity were estimated from the fitted curves. Patch size for Anthozoans was smaller than that for Hydrozoans in all three communities. Diversity was greatest in the cornmunities with the lowest and with the highest light intensity and water flow levels, but species richness was highest in the intermediate community.
    [Show full text]