Spatial distribution of foraging by female Antarctic fur seals
The study examined the distribution of critical habitat for foraging by female Antarctic fur seals breeding at the island of South Georgia. Bathymetric features of the continental shelf around the island of South Georgia were an important indicator for the localisation of foraging. This pattern was...
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/4a265c0a-cd08-4c3b-8846-f2ce2c4a285a 2024-06-23T07:47:39+00:00 Spatial distribution of foraging by female Antarctic fur seals Boyd, Ian Lamont Staniland, IJ Martin, AR 2002 https://research-portal.st-andrews.ac.uk/en/researchoutput/spatial-distribution-of-foraging-by-female-antarctic-fur-seals(4a265c0a-cd08-4c3b-8846-f2ce2c4a285a).html http://www.scopus.com/inward/record.url?scp=0037175217&partnerID=8YFLogxK eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/spatial-distribution-of-foraging-by-female-antarctic-fur-seals(4a265c0a-cd08-4c3b-8846-f2ce2c4a285a).html info:eu-repo/semantics/restrictedAccess Boyd , I L , Staniland , IJ & Martin , AR 2002 , ' Spatial distribution of foraging by female Antarctic fur seals ' , Marine Ecology Progress Series , vol. 242 , pp. 285-294 . Southern Ocean krill dispersion behavior critical habitat ice edge Patagonian Shelf South Georgia predator-prey interactions Arctocephalus gazella TROPHIC-LEVEL PREDATORS SOUTH-GEORGIA ARCTOCEPHALUS-GAZELLA MARINE ECOSYSTEM INTERANNUAL VARIABILITY ELEPHANT SEALS TIME MOVEMENTS SEABIRDS article 2002 ftunstandrewcris 2024-06-13T00:07:09Z The study examined the distribution of critical habitat for foraging by female Antarctic fur seals breeding at the island of South Georgia. Bathymetric features of the continental shelf around the island of South Georgia were an important indicator for the localisation of foraging. This pattern was consistent among years of different prey availability. Lactating females were constrained to forage mainly within 100 km of the location at which the offspring was being raised. When this constraint was removed at the end of lactation, females foraged to much greater ranges and dispersed to specific regions of the continental shelf east of Patagonia (>1000 km) and to the northern edge of the Antarctic pack ice (500 km). The empirical distribution of foraging during the breeding season was used to develop a function that described the foraging distribution for the whole breeding population of females. The result was consistent with past observations from ship-based surveys and it allowed estimation of the spatial impact of breeding female fur seals on krill at South Georgia. This suggested that, in extreme cases and assuming that krill influx is limited, female fur seals could eat most of the krill present in some regions where they forage intensively. However, mean consumption was about one-tenth of the mean density of krill. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seals Arctocephalus gazella Elephant Seals Southern Ocean University of St Andrews: Research Portal Antarctic Patagonia Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Southern Ocean krill dispersion behavior critical habitat ice edge Patagonian Shelf South Georgia predator-prey interactions Arctocephalus gazella TROPHIC-LEVEL PREDATORS SOUTH-GEORGIA ARCTOCEPHALUS-GAZELLA MARINE ECOSYSTEM INTERANNUAL VARIABILITY ELEPHANT SEALS TIME MOVEMENTS SEABIRDS |
spellingShingle |
Southern Ocean krill dispersion behavior critical habitat ice edge Patagonian Shelf South Georgia predator-prey interactions Arctocephalus gazella TROPHIC-LEVEL PREDATORS SOUTH-GEORGIA ARCTOCEPHALUS-GAZELLA MARINE ECOSYSTEM INTERANNUAL VARIABILITY ELEPHANT SEALS TIME MOVEMENTS SEABIRDS Boyd, Ian Lamont Staniland, IJ Martin, AR Spatial distribution of foraging by female Antarctic fur seals |
topic_facet |
Southern Ocean krill dispersion behavior critical habitat ice edge Patagonian Shelf South Georgia predator-prey interactions Arctocephalus gazella TROPHIC-LEVEL PREDATORS SOUTH-GEORGIA ARCTOCEPHALUS-GAZELLA MARINE ECOSYSTEM INTERANNUAL VARIABILITY ELEPHANT SEALS TIME MOVEMENTS SEABIRDS |
description |
The study examined the distribution of critical habitat for foraging by female Antarctic fur seals breeding at the island of South Georgia. Bathymetric features of the continental shelf around the island of South Georgia were an important indicator for the localisation of foraging. This pattern was consistent among years of different prey availability. Lactating females were constrained to forage mainly within 100 km of the location at which the offspring was being raised. When this constraint was removed at the end of lactation, females foraged to much greater ranges and dispersed to specific regions of the continental shelf east of Patagonia (>1000 km) and to the northern edge of the Antarctic pack ice (500 km). The empirical distribution of foraging during the breeding season was used to develop a function that described the foraging distribution for the whole breeding population of females. The result was consistent with past observations from ship-based surveys and it allowed estimation of the spatial impact of breeding female fur seals on krill at South Georgia. This suggested that, in extreme cases and assuming that krill influx is limited, female fur seals could eat most of the krill present in some regions where they forage intensively. However, mean consumption was about one-tenth of the mean density of krill. |
format |
Article in Journal/Newspaper |
author |
Boyd, Ian Lamont Staniland, IJ Martin, AR |
author_facet |
Boyd, Ian Lamont Staniland, IJ Martin, AR |
author_sort |
Boyd, Ian Lamont |
title |
Spatial distribution of foraging by female Antarctic fur seals |
title_short |
Spatial distribution of foraging by female Antarctic fur seals |
title_full |
Spatial distribution of foraging by female Antarctic fur seals |
title_fullStr |
Spatial distribution of foraging by female Antarctic fur seals |
title_full_unstemmed |
Spatial distribution of foraging by female Antarctic fur seals |
title_sort |
spatial distribution of foraging by female antarctic fur seals |
publishDate |
2002 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/spatial-distribution-of-foraging-by-female-antarctic-fur-seals(4a265c0a-cd08-4c3b-8846-f2ce2c4a285a).html http://www.scopus.com/inward/record.url?scp=0037175217&partnerID=8YFLogxK |
geographic |
Antarctic Patagonia Southern Ocean The Antarctic |
geographic_facet |
Antarctic Patagonia Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Fur Seals Arctocephalus gazella Elephant Seals Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Fur Seals Arctocephalus gazella Elephant Seals Southern Ocean |
op_source |
Boyd , I L , Staniland , IJ & Martin , AR 2002 , ' Spatial distribution of foraging by female Antarctic fur seals ' , Marine Ecology Progress Series , vol. 242 , pp. 285-294 . |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/spatial-distribution-of-foraging-by-female-antarctic-fur-seals(4a265c0a-cd08-4c3b-8846-f2ce2c4a285a).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1802651790026473472 |