Spatial and temporal variability in the fish diet of Antarctic fur seal ( Arctocephalus gazella ) in the Atlantic sector of the Southern Ocean
The spatial and temporal variability in the fish component of the diet of Antarctic fur seals (Arctocephalus gazella (Peters, 1875)) in the Atlantic sector of the Southern Ocean was examined using diet data from 10 sites in the region including a 13-year time series from South Georgia. The fish spec...
Published in: | Canadian Journal of Zoology |
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Online Access: | http://dx.doi.org/10.1139/z06-071 http://www.nrcresearchpress.com/doi/pdf/10.1139/z06-071 |
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crcansciencepubl:10.1139/z06-071 2024-04-07T07:47:33+00:00 Spatial and temporal variability in the fish diet of Antarctic fur seal ( Arctocephalus gazella ) in the Atlantic sector of the Southern Ocean Davis, Dexter Staniland, Iain J. Reid, Keith 2006 http://dx.doi.org/10.1139/z06-071 http://www.nrcresearchpress.com/doi/pdf/10.1139/z06-071 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 84, issue 7, page 1025-1037 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2006 crcansciencepubl https://doi.org/10.1139/z06-071 2024-03-08T00:37:43Z The spatial and temporal variability in the fish component of the diet of Antarctic fur seals (Arctocephalus gazella (Peters, 1875)) in the Atlantic sector of the Southern Ocean was examined using diet data from 10 sites in the region including a 13-year time series from South Georgia. The fish species composition in the diet at each site showed a strong relationship with the local marine habitat / topography. The absence of formerly harvested fish species indicates a lack of recovery of stocks of Notothenia rossii Richardson, 1844 at South Georgia and Champsocephalus gunnari Lönnberg, 1905 at the South Orkney Islands. At South Georgia, Protomyctophum choriodon Hulley, 1981, Lepidonotothen larseni (Lönnberg, 1905), and C. gunnari were the most important species in the diet between 1991 and 2004. Variability in the occurrence of C. gunnari was driven mainly by annual scale processes, particularly those that influence the availability of Antarctic krill (Euphausia superba (Dana, 1852)). The occurrence of the pelagic P. choriodon was primarily influenced by shorter-term water mass changes within the foraging range of the seals. The fish composition in the diet reflects differences in marine habitat / topography, as well as variability, at a range of time scales that reflect environmental variability and harvesting. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Antarctic Krill Arctocephalus gazella Euphausia superba Notothenia rossii South Orkney Islands Southern Ocean Canadian Science Publishing Antarctic Southern Ocean South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Canadian Journal of Zoology 84 7 1025 1037 |
institution |
Open Polar |
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Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Davis, Dexter Staniland, Iain J. Reid, Keith Spatial and temporal variability in the fish diet of Antarctic fur seal ( Arctocephalus gazella ) in the Atlantic sector of the Southern Ocean |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
The spatial and temporal variability in the fish component of the diet of Antarctic fur seals (Arctocephalus gazella (Peters, 1875)) in the Atlantic sector of the Southern Ocean was examined using diet data from 10 sites in the region including a 13-year time series from South Georgia. The fish species composition in the diet at each site showed a strong relationship with the local marine habitat / topography. The absence of formerly harvested fish species indicates a lack of recovery of stocks of Notothenia rossii Richardson, 1844 at South Georgia and Champsocephalus gunnari Lönnberg, 1905 at the South Orkney Islands. At South Georgia, Protomyctophum choriodon Hulley, 1981, Lepidonotothen larseni (Lönnberg, 1905), and C. gunnari were the most important species in the diet between 1991 and 2004. Variability in the occurrence of C. gunnari was driven mainly by annual scale processes, particularly those that influence the availability of Antarctic krill (Euphausia superba (Dana, 1852)). The occurrence of the pelagic P. choriodon was primarily influenced by shorter-term water mass changes within the foraging range of the seals. The fish composition in the diet reflects differences in marine habitat / topography, as well as variability, at a range of time scales that reflect environmental variability and harvesting. |
format |
Article in Journal/Newspaper |
author |
Davis, Dexter Staniland, Iain J. Reid, Keith |
author_facet |
Davis, Dexter Staniland, Iain J. Reid, Keith |
author_sort |
Davis, Dexter |
title |
Spatial and temporal variability in the fish diet of Antarctic fur seal ( Arctocephalus gazella ) in the Atlantic sector of the Southern Ocean |
title_short |
Spatial and temporal variability in the fish diet of Antarctic fur seal ( Arctocephalus gazella ) in the Atlantic sector of the Southern Ocean |
title_full |
Spatial and temporal variability in the fish diet of Antarctic fur seal ( Arctocephalus gazella ) in the Atlantic sector of the Southern Ocean |
title_fullStr |
Spatial and temporal variability in the fish diet of Antarctic fur seal ( Arctocephalus gazella ) in the Atlantic sector of the Southern Ocean |
title_full_unstemmed |
Spatial and temporal variability in the fish diet of Antarctic fur seal ( Arctocephalus gazella ) in the Atlantic sector of the Southern Ocean |
title_sort |
spatial and temporal variability in the fish diet of antarctic fur seal ( arctocephalus gazella ) in the atlantic sector of the southern ocean |
publisher |
Canadian Science Publishing |
publishDate |
2006 |
url |
http://dx.doi.org/10.1139/z06-071 http://www.nrcresearchpress.com/doi/pdf/10.1139/z06-071 |
long_lat |
ENVELOPE(-45.500,-45.500,-60.583,-60.583) |
geographic |
Antarctic Southern Ocean South Orkney Islands |
geographic_facet |
Antarctic Southern Ocean South Orkney Islands |
genre |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Antarctic Krill Arctocephalus gazella Euphausia superba Notothenia rossii South Orkney Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Antarctic Krill Arctocephalus gazella Euphausia superba Notothenia rossii South Orkney Islands Southern Ocean |
op_source |
Canadian Journal of Zoology volume 84, issue 7, page 1025-1037 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z06-071 |
container_title |
Canadian Journal of Zoology |
container_volume |
84 |
container_issue |
7 |
container_start_page |
1025 |
op_container_end_page |
1037 |
_version_ |
1795674683188707328 |