Responses of Antarctic pack-ice seals to environmental change and increasing krill fishing
The compound effects of changing habitats, ecosystem interactions, and fishing practices have implications for the management of Antarctic krill and conservation of its predators. For Antarctic pack-ice seals, an important group of krill predators, we estimate the density and krill consumption in th...
Published in: | Biological Conservation |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2012
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/responses-of-antarctic-packice-seals-to-environmental-change-and-increasing-krill-fishing(08c1b65a-9b84-4b0e-8d4b-c73e4545d3d0).html https://doi.org/10.1016/j.biocon.2012.02.002 |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/08c1b65a-9b84-4b0e-8d4b-c73e4545d3d0 2023-05-15T13:58:40+02:00 Responses of Antarctic pack-ice seals to environmental change and increasing krill fishing Forcada, J Trathan, P.N. Boveng, P.L. Boyd, Ian Burns, J.M. Costa, D.P. Fedak, Mike Rogers, T.L. Southwell, C.M. 2012 https://risweb.st-andrews.ac.uk/portal/en/researchoutput/responses-of-antarctic-packice-seals-to-environmental-change-and-increasing-krill-fishing(08c1b65a-9b84-4b0e-8d4b-c73e4545d3d0).html https://doi.org/10.1016/j.biocon.2012.02.002 eng eng info:eu-repo/semantics/restrictedAccess Forcada , J , Trathan , P N , Boveng , P L , Boyd , I , Burns , J M , Costa , D P , Fedak , M , Rogers , T L & Southwell , C M 2012 , ' Responses of Antarctic pack-ice seals to environmental change and increasing krill fishing ' , Biological Conservation , vol. 149 , pp. 40-50 . https://doi.org/10.1016/j.biocon.2012.02.002 article 2012 ftunstandrewcris https://doi.org/10.1016/j.biocon.2012.02.002 2021-12-26T14:21:02Z The compound effects of changing habitats, ecosystem interactions, and fishing practices have implications for the management of Antarctic krill and conservation of its predators. For Antarctic pack-ice seals, an important group of krill predators, we estimate the density and krill consumption in the West Antarctic Peninsula (WAP)–Western Weddell Sea area, the main fishery region; and we consider long-term changes in suitable pack-ice habitat, increased fishing pressure and potential krill declines based upon predictions from declines in sea ice cover. More than 3 million crabeater seals consumed over 12 million tonnes of krill each year. This was approximately 17% of the krill standing stock. The highest densities of pack ice seals where found in the WAP, including in its small-scale fishery management areas, where apparently suitable seal habitat has declined by 21–28% over a 30 year period, where krill density is likely to have declined, and fishing has increased. The highest seal density was found in the Marguerite Bay area which is a source of krill for the Antarctic Peninsula and elsewhere. Significant sea-ice loss since 1979 has already occurred, leading to open water and possible expansion for the fishery in the future. These factors may combine to potentially reduce food for pack ice seals. Therefore, high uncertainty in krill and seal stock trends and in their environmental drivers call for a precautionary management of the krill fishery, in the absence of survey data to support management based on specific conservation objectives for pack-ice seals. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctic Peninsula Crabeater Seals Sea ice Weddell Sea University of St Andrews: Research Portal Antarctic Antarctic Peninsula Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) The Antarctic Weddell Weddell Sea Biological Conservation 149 1 40 50 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
description |
The compound effects of changing habitats, ecosystem interactions, and fishing practices have implications for the management of Antarctic krill and conservation of its predators. For Antarctic pack-ice seals, an important group of krill predators, we estimate the density and krill consumption in the West Antarctic Peninsula (WAP)–Western Weddell Sea area, the main fishery region; and we consider long-term changes in suitable pack-ice habitat, increased fishing pressure and potential krill declines based upon predictions from declines in sea ice cover. More than 3 million crabeater seals consumed over 12 million tonnes of krill each year. This was approximately 17% of the krill standing stock. The highest densities of pack ice seals where found in the WAP, including in its small-scale fishery management areas, where apparently suitable seal habitat has declined by 21–28% over a 30 year period, where krill density is likely to have declined, and fishing has increased. The highest seal density was found in the Marguerite Bay area which is a source of krill for the Antarctic Peninsula and elsewhere. Significant sea-ice loss since 1979 has already occurred, leading to open water and possible expansion for the fishery in the future. These factors may combine to potentially reduce food for pack ice seals. Therefore, high uncertainty in krill and seal stock trends and in their environmental drivers call for a precautionary management of the krill fishery, in the absence of survey data to support management based on specific conservation objectives for pack-ice seals. |
format |
Article in Journal/Newspaper |
author |
Forcada, J Trathan, P.N. Boveng, P.L. Boyd, Ian Burns, J.M. Costa, D.P. Fedak, Mike Rogers, T.L. Southwell, C.M. |
spellingShingle |
Forcada, J Trathan, P.N. Boveng, P.L. Boyd, Ian Burns, J.M. Costa, D.P. Fedak, Mike Rogers, T.L. Southwell, C.M. Responses of Antarctic pack-ice seals to environmental change and increasing krill fishing |
author_facet |
Forcada, J Trathan, P.N. Boveng, P.L. Boyd, Ian Burns, J.M. Costa, D.P. Fedak, Mike Rogers, T.L. Southwell, C.M. |
author_sort |
Forcada, J |
title |
Responses of Antarctic pack-ice seals to environmental change and increasing krill fishing |
title_short |
Responses of Antarctic pack-ice seals to environmental change and increasing krill fishing |
title_full |
Responses of Antarctic pack-ice seals to environmental change and increasing krill fishing |
title_fullStr |
Responses of Antarctic pack-ice seals to environmental change and increasing krill fishing |
title_full_unstemmed |
Responses of Antarctic pack-ice seals to environmental change and increasing krill fishing |
title_sort |
responses of antarctic pack-ice seals to environmental change and increasing krill fishing |
publishDate |
2012 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/responses-of-antarctic-packice-seals-to-environmental-change-and-increasing-krill-fishing(08c1b65a-9b84-4b0e-8d4b-c73e4545d3d0).html https://doi.org/10.1016/j.biocon.2012.02.002 |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) |
geographic |
Antarctic Antarctic Peninsula Marguerite Marguerite Bay The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Marguerite Marguerite Bay The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Crabeater Seals Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Crabeater Seals Sea ice Weddell Sea |
op_source |
Forcada , J , Trathan , P N , Boveng , P L , Boyd , I , Burns , J M , Costa , D P , Fedak , M , Rogers , T L & Southwell , C M 2012 , ' Responses of Antarctic pack-ice seals to environmental change and increasing krill fishing ' , Biological Conservation , vol. 149 , pp. 40-50 . https://doi.org/10.1016/j.biocon.2012.02.002 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.biocon.2012.02.002 |
container_title |
Biological Conservation |
container_volume |
149 |
container_issue |
1 |
container_start_page |
40 |
op_container_end_page |
50 |
_version_ |
1766267011045785600 |