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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*
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

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.

Type
Biological Sciences
Copyright
© Antarctic Science Ltd 2014 

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