Fur seal diving behaviour in relation to vertical distribution of krill
Quantitative studies of predator-prey interactions depend on a knowledge of their spatial dynamics and behaviour. Studies on marine vertebrates have hitherto been precluded by the difficulty of acquiring the relevant data. (2) Continuous records of diving depths of female Antarctic fur seals on 3-8...
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British Ecological Society
1985
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Online Access: | http://nora.nerc.ac.uk/id/eprint/523324/ https://doi.org/10.2307/4616 |
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ftnerc:oai:nora.nerc.ac.uk:523324 2023-05-15T13:41:43+02:00 Fur seal diving behaviour in relation to vertical distribution of krill Croxall, J.P. Everson, I. Kooyman, G.L. Ricketts, C. Davis, R.W. 1985 http://nora.nerc.ac.uk/id/eprint/523324/ https://doi.org/10.2307/4616 unknown British Ecological Society Croxall, J.P.; Everson, I.; Kooyman, G.L.; Ricketts, C.; Davis, R.W. 1985 Fur seal diving behaviour in relation to vertical distribution of krill. The Journal of Animal Ecology, 54 (1). 1-8. https://doi.org/10.2307/4616 <https://doi.org/10.2307/4616> Publication - Article PeerReviewed 1985 ftnerc https://doi.org/10.2307/4616 2023-02-04T19:48:22Z Quantitative studies of predator-prey interactions depend on a knowledge of their spatial dynamics and behaviour. Studies on marine vertebrates have hitherto been precluded by the difficulty of acquiring the relevant data. (2) Continuous records of diving depths of female Antarctic fur seals on 3-8 day feeding trips to sea from South Georgia were analysed in conjunction with data on diel changes in the abundance and distribution of their main prey, krill. (3) In 36 complete days foraging by seven seals, 75% of 4273 dives were at night. Dives then were consistently shallower (dive depth <30 m) than in daytime (mostly 40-75 m). (4) This closely matched changes in the vertical distribution of krill, nearly all of which was below a depth of 50 m from 09.00-15.00 h, with substantial quantities above 40 m only between 21.00-06.00 h. (5) Although over 40% of krill in the water column at any time of day was below 75 m, only 3% of dives exceeded this depth. We suggest that because krill migrate vertically fur seals are able to exploit them most efficiently during shallow dives at night. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seals Natural Environment Research Council: NERC Open Research Archive Antarctic The Journal of Animal Ecology 54 1 1 |
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Natural Environment Research Council: NERC Open Research Archive |
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description |
Quantitative studies of predator-prey interactions depend on a knowledge of their spatial dynamics and behaviour. Studies on marine vertebrates have hitherto been precluded by the difficulty of acquiring the relevant data. (2) Continuous records of diving depths of female Antarctic fur seals on 3-8 day feeding trips to sea from South Georgia were analysed in conjunction with data on diel changes in the abundance and distribution of their main prey, krill. (3) In 36 complete days foraging by seven seals, 75% of 4273 dives were at night. Dives then were consistently shallower (dive depth <30 m) than in daytime (mostly 40-75 m). (4) This closely matched changes in the vertical distribution of krill, nearly all of which was below a depth of 50 m from 09.00-15.00 h, with substantial quantities above 40 m only between 21.00-06.00 h. (5) Although over 40% of krill in the water column at any time of day was below 75 m, only 3% of dives exceeded this depth. We suggest that because krill migrate vertically fur seals are able to exploit them most efficiently during shallow dives at night. |
format |
Article in Journal/Newspaper |
author |
Croxall, J.P. Everson, I. Kooyman, G.L. Ricketts, C. Davis, R.W. |
spellingShingle |
Croxall, J.P. Everson, I. Kooyman, G.L. Ricketts, C. Davis, R.W. Fur seal diving behaviour in relation to vertical distribution of krill |
author_facet |
Croxall, J.P. Everson, I. Kooyman, G.L. Ricketts, C. Davis, R.W. |
author_sort |
Croxall, J.P. |
title |
Fur seal diving behaviour in relation to vertical distribution of krill |
title_short |
Fur seal diving behaviour in relation to vertical distribution of krill |
title_full |
Fur seal diving behaviour in relation to vertical distribution of krill |
title_fullStr |
Fur seal diving behaviour in relation to vertical distribution of krill |
title_full_unstemmed |
Fur seal diving behaviour in relation to vertical distribution of krill |
title_sort |
fur seal diving behaviour in relation to vertical distribution of krill |
publisher |
British Ecological Society |
publishDate |
1985 |
url |
http://nora.nerc.ac.uk/id/eprint/523324/ https://doi.org/10.2307/4616 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Fur Seals |
genre_facet |
Antarc* Antarctic Antarctic Fur Seals |
op_relation |
Croxall, J.P.; Everson, I.; Kooyman, G.L.; Ricketts, C.; Davis, R.W. 1985 Fur seal diving behaviour in relation to vertical distribution of krill. The Journal of Animal Ecology, 54 (1). 1-8. https://doi.org/10.2307/4616 <https://doi.org/10.2307/4616> |
op_doi |
https://doi.org/10.2307/4616 |
container_title |
The Journal of Animal Ecology |
container_volume |
54 |
container_issue |
1 |
container_start_page |
1 |
_version_ |
1766154883604414464 |