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Spatial patterns of summer demersal fish assemblages around the Antarctic Peninsula and South Shetland Islands

Published online by Cambridge University Press:  28 August 2014

Facundo Llompart ,
Matías Delpiani ,
Eugenia Lattuca ,
Gabriela Delpiani ,
Adriana Cruz-Jiménez ,
Paula Orlando ,
Santiago Ceballos ,
Juan Martín Díaz De Astarloa ,
Fabián Vanella  and
Daniel Fernández
Facundo Llompart*
Affiliation:
Centro Austral de Investigaciones Científicas (CADIC-CONICET), Laboratorio de Ecología, Fisiología y Evolución de organismos acuáticos, Bernardo Houssay 200, Ushuaia, Argentina Universidad Nacional de Tierra del Fuego (UNTDF), Onas 400, Ushuaia, Argentina
Matías Delpiani
Affiliation:
Instituto de Investigaciones Marinas y Costeras (IIMYC-CONICET), Grupo de Biotaxonomía Morfológica y Molecular de Peces, Universidad Nacional de Mar del Plata, Dean Funes 3350, Mar del Plata, Argentina
Eugenia Lattuca
Affiliation:
Centro Austral de Investigaciones Científicas (CADIC-CONICET), Laboratorio de Ecología, Fisiología y Evolución de organismos acuáticos, Bernardo Houssay 200, Ushuaia, Argentina
Gabriela Delpiani
Affiliation:
Instituto de Investigaciones Marinas y Costeras (IIMYC-CONICET), Grupo de Biotaxonomía Morfológica y Molecular de Peces, Universidad Nacional de Mar del Plata, Dean Funes 3350, Mar del Plata, Argentina
Adriana Cruz-Jiménez
Affiliation:
Centro Austral de Investigaciones Científicas (CADIC-CONICET), Laboratorio de Ecología, Fisiología y Evolución de organismos acuáticos, Bernardo Houssay 200, Ushuaia, Argentina
Paula Orlando
Affiliation:
Instituto de Investigaciones Marinas y Costeras (IIMYC-CONICET), Grupo de Biotaxonomía Morfológica y Molecular de Peces, Universidad Nacional de Mar del Plata, Dean Funes 3350, Mar del Plata, Argentina
Santiago Ceballos
Affiliation:
Centro Austral de Investigaciones Científicas (CADIC-CONICET), Laboratorio de Ecología, Fisiología y Evolución de organismos acuáticos, Bernardo Houssay 200, Ushuaia, Argentina Universidad Nacional de Tierra del Fuego (UNTDF), Onas 400, Ushuaia, Argentina
Juan Martín Díaz De Astarloa
Affiliation:
Instituto de Investigaciones Marinas y Costeras (IIMYC-CONICET), Grupo de Biotaxonomía Morfológica y Molecular de Peces, Universidad Nacional de Mar del Plata, Dean Funes 3350, Mar del Plata, Argentina
Fabián Vanella
Affiliation:
Centro Austral de Investigaciones Científicas (CADIC-CONICET), Laboratorio de Ecología, Fisiología y Evolución de organismos acuáticos, Bernardo Houssay 200, Ushuaia, Argentina
Daniel Fernández
Affiliation:
Centro Austral de Investigaciones Científicas (CADIC-CONICET), Laboratorio de Ecología, Fisiología y Evolución de organismos acuáticos, Bernardo Houssay 200, Ushuaia, Argentina Universidad Nacional de Tierra del Fuego (UNTDF), Onas 400, Ushuaia, Argentina
*
facallompart@yahoo.com.ar
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Abstract

During the research programme conducted on the OV Puerto Deseado in the summers of 2011 and 2013, 36 stations were sampled using a demersal net at depths between 53–590 m in the Antarctic Peninsula and South Shetland Islands. A total 3378 fish specimens belonging to 36 species were recorded. Notothenidae was the best-represented family in species number, with Lepidonotothen nudifrons, L. larseni and Trematomus scotti being the most numerous species. Of the fish assemblages, 20% of the species were considered as dominant, 10% as common, 13% as occasional and 57% as rare. Six groups (and two sub-groups) were obtained by the ordination diagram based on geographical location: group 1=Gerlache Strait, group 2=Deception Islands, group 3=Biscoe Island, group 4=between Elephant and King George islands, group 5=northern Antarctic Peninsula, and group 6=South Shetland Islands, with sub-groups 6a shallower South Shetland Islands and 6b deeper South Shetland Islands. Sampling depth and water temperature significantly explained the spatial pattern. A latitudinal pattern of decreasing abundance from north-east to south-west was found in L. larseni and the opposite in T. scotti. The predictability of fish composition in the assemblages’ areas could be a useful tool for ecosystem-based management.

Keywords

Antarcticadepthfish faunaichthyofaunistic areasNototheniidae
Type
Biological Sciences
Information
Antarctic Science , Volume 27 , Issue 2 , April 2015 , pp. 109 - 117
Copyright
© Antarctic Science Ltd 2014 

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