Squid in the diet of Antarctic fur seals: potential links to oceanographic conditions and Antarctic krill abundance
Understanding how changes in oceanographic conditions affect predators and their prey is fundamental for interpreting variability in natural marine ecosystems. At South Georgia, Antarctic fur seals Arctocephalus gazella are known cephalopod predators and potential indicators of change of regional en...
Published in: | Marine Ecology Progress Series |
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Online Access: | http://nora.nerc.ac.uk/id/eprint/525205/ https://doi.org/10.3354/meps13100 |
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ftnerc:oai:nora.nerc.ac.uk:525205 2023-05-15T13:41:44+02:00 Squid in the diet of Antarctic fur seals: potential links to oceanographic conditions and Antarctic krill abundance Abreu, José Staniland, Iain Rodrigues, Clara F. Queirós, José P. Pereira, Jorge M. Xavier, Jose C. 2019-10 http://nora.nerc.ac.uk/id/eprint/525205/ https://doi.org/10.3354/meps13100 unknown Inter-Research Abreu, José; Staniland, Iain orcid:0000-0003-2736-9134 Rodrigues, Clara F.; Queirós, José P.; Pereira, Jorge M.; Xavier, Jose C. orcid:0000-0002-9621-6660 . 2019 Squid in the diet of Antarctic fur seals: potential links to oceanographic conditions and Antarctic krill abundance. Marine Ecology Progress Series, 628. 211-221. https://doi.org/10.3354/meps13100 <https://doi.org/10.3354/meps13100> Publication - Article PeerReviewed 2019 ftnerc https://doi.org/10.3354/meps13100 2023-02-04T19:49:18Z Understanding how changes in oceanographic conditions affect predators and their prey is fundamental for interpreting variability in natural marine ecosystems. At South Georgia, Antarctic fur seals Arctocephalus gazella are known cephalopod predators and potential indicators of change of regional environment conditions and in prey availability. The cephalopod component of the diet of Antarctic fur seals at South Georgia was assessed using lower beaks found in scats collected over five consecutive years (2009–2013) under known variable oceanographic conditions. In years of unusual warm oceanographic conditions around South Georgia and low Antarctic krill Euphausia superba density, the number of the squid Slosarczykovia circumantarctica increased in the Antarctic fur seal’s diet. Moreover, through stable isotope analysis on beaks, S. circumantarctica exhibited higher δ15N values in years that were associated with an offshore habitat isotopic signature where Antarctic fur seals have been foraging. This study provides evidence of the ecological links between the feeding behaviour of Antarctic fur seals, their main cephalopod prey, Antarctic krill densities and oceanographic conditions Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seals Antarctic Krill Arctocephalus gazella Euphausia superba Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Marine Ecology Progress Series 628 211 221 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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description |
Understanding how changes in oceanographic conditions affect predators and their prey is fundamental for interpreting variability in natural marine ecosystems. At South Georgia, Antarctic fur seals Arctocephalus gazella are known cephalopod predators and potential indicators of change of regional environment conditions and in prey availability. The cephalopod component of the diet of Antarctic fur seals at South Georgia was assessed using lower beaks found in scats collected over five consecutive years (2009–2013) under known variable oceanographic conditions. In years of unusual warm oceanographic conditions around South Georgia and low Antarctic krill Euphausia superba density, the number of the squid Slosarczykovia circumantarctica increased in the Antarctic fur seal’s diet. Moreover, through stable isotope analysis on beaks, S. circumantarctica exhibited higher δ15N values in years that were associated with an offshore habitat isotopic signature where Antarctic fur seals have been foraging. This study provides evidence of the ecological links between the feeding behaviour of Antarctic fur seals, their main cephalopod prey, Antarctic krill densities and oceanographic conditions |
format |
Article in Journal/Newspaper |
author |
Abreu, José Staniland, Iain Rodrigues, Clara F. Queirós, José P. Pereira, Jorge M. Xavier, Jose C. |
spellingShingle |
Abreu, José Staniland, Iain Rodrigues, Clara F. Queirós, José P. Pereira, Jorge M. Xavier, Jose C. Squid in the diet of Antarctic fur seals: potential links to oceanographic conditions and Antarctic krill abundance |
author_facet |
Abreu, José Staniland, Iain Rodrigues, Clara F. Queirós, José P. Pereira, Jorge M. Xavier, Jose C. |
author_sort |
Abreu, José |
title |
Squid in the diet of Antarctic fur seals: potential links to oceanographic conditions and Antarctic krill abundance |
title_short |
Squid in the diet of Antarctic fur seals: potential links to oceanographic conditions and Antarctic krill abundance |
title_full |
Squid in the diet of Antarctic fur seals: potential links to oceanographic conditions and Antarctic krill abundance |
title_fullStr |
Squid in the diet of Antarctic fur seals: potential links to oceanographic conditions and Antarctic krill abundance |
title_full_unstemmed |
Squid in the diet of Antarctic fur seals: potential links to oceanographic conditions and Antarctic krill abundance |
title_sort |
squid in the diet of antarctic fur seals: potential links to oceanographic conditions and antarctic krill abundance |
publisher |
Inter-Research |
publishDate |
2019 |
url |
http://nora.nerc.ac.uk/id/eprint/525205/ https://doi.org/10.3354/meps13100 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctic Fur Seals Antarctic Krill Arctocephalus gazella Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Fur Seals Antarctic Krill Arctocephalus gazella Euphausia superba |
op_relation |
Abreu, José; Staniland, Iain orcid:0000-0003-2736-9134 Rodrigues, Clara F.; Queirós, José P.; Pereira, Jorge M.; Xavier, Jose C. orcid:0000-0002-9621-6660 . 2019 Squid in the diet of Antarctic fur seals: potential links to oceanographic conditions and Antarctic krill abundance. Marine Ecology Progress Series, 628. 211-221. https://doi.org/10.3354/meps13100 <https://doi.org/10.3354/meps13100> |
op_doi |
https://doi.org/10.3354/meps13100 |
container_title |
Marine Ecology Progress Series |
container_volume |
628 |
container_start_page |
211 |
op_container_end_page |
221 |
_version_ |
1766155890944114688 |