Time budgets and foraging characteristics of lactating Antarctic fur seals
(1) We investigated time allocation to parental care ashore and foraging at sea by lactating Antarctic fur seals at Bird Island, South Georgia, during 1988-89 and 1989-90 and related this to foraging behaviour measured in terms of diving performance at sea and growth of pups. (2) The mean duration o...
Published in: | The Journal of Animal Ecology |
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British Ecological Society
1991
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Online Access: | http://nora.nerc.ac.uk/id/eprint/519658/ https://doi.org/10.2307/5299 |
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ftnerc:oai:nora.nerc.ac.uk:519658 2023-05-15T13:49:34+02:00 Time budgets and foraging characteristics of lactating Antarctic fur seals Boyd, I.L. Lunn, N.J. Barton, T. 1991-06 http://nora.nerc.ac.uk/id/eprint/519658/ https://doi.org/10.2307/5299 unknown British Ecological Society Boyd, I.L.; Lunn, N.J.; Barton, T. 1991 Time budgets and foraging characteristics of lactating Antarctic fur seals. The Journal of Animal Ecology, 60 (2). 577-592. https://doi.org/10.2307/5299 <https://doi.org/10.2307/5299> Publication - Article PeerReviewed 1991 ftnerc https://doi.org/10.2307/5299 2023-02-04T19:46:21Z (1) We investigated time allocation to parental care ashore and foraging at sea by lactating Antarctic fur seals at Bird Island, South Georgia, during 1988-89 and 1989-90 and related this to foraging behaviour measured in terms of diving performance at sea and growth of pups. (2) The mean duration of foraging trips was 121 h and 100 h in 1988-89 and 1989-90, respectively, while periods ashore were 55 h and 45 h, respectively in the two years. There was a significant difference between these variables in the two years but there was no significant difference in the percentage of time spent at sea. In both years, there was significant variation between individuals in the foraging-attendance time budget. (3) There was a positive correlation between mean time spent ashore and mean time spent at sea for individual seals. The foraging-attendance patterns of seals changed significantly with time through lactation in one year of the study but not in the other. There was no effect of maternal age or size on foraging-attendance time budget. Duration of foraging trips or the period spent ashore had no effect on pup growth rate. (4) During short foraging trips (1-2 d) seals dived for a greater proportion of the time available for foraging than during longer foraging trips (>3 d). Seals fed predominantly on krill during both years. Most foraging occurred at night and this was reflected in diel variation in times of arrival and departure of seals from the pupping colony. Based on estimated swimming speed and travel times to and from Bird Island, it was estimated that seals were normally feeding between 60 and 90 km from Bird Island. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seals Bird Island Natural Environment Research Council: NERC Open Research Archive Antarctic Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) The Journal of Animal Ecology 60 2 577 |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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description |
(1) We investigated time allocation to parental care ashore and foraging at sea by lactating Antarctic fur seals at Bird Island, South Georgia, during 1988-89 and 1989-90 and related this to foraging behaviour measured in terms of diving performance at sea and growth of pups. (2) The mean duration of foraging trips was 121 h and 100 h in 1988-89 and 1989-90, respectively, while periods ashore were 55 h and 45 h, respectively in the two years. There was a significant difference between these variables in the two years but there was no significant difference in the percentage of time spent at sea. In both years, there was significant variation between individuals in the foraging-attendance time budget. (3) There was a positive correlation between mean time spent ashore and mean time spent at sea for individual seals. The foraging-attendance patterns of seals changed significantly with time through lactation in one year of the study but not in the other. There was no effect of maternal age or size on foraging-attendance time budget. Duration of foraging trips or the period spent ashore had no effect on pup growth rate. (4) During short foraging trips (1-2 d) seals dived for a greater proportion of the time available for foraging than during longer foraging trips (>3 d). Seals fed predominantly on krill during both years. Most foraging occurred at night and this was reflected in diel variation in times of arrival and departure of seals from the pupping colony. Based on estimated swimming speed and travel times to and from Bird Island, it was estimated that seals were normally feeding between 60 and 90 km from Bird Island. |
format |
Article in Journal/Newspaper |
author |
Boyd, I.L. Lunn, N.J. Barton, T. |
spellingShingle |
Boyd, I.L. Lunn, N.J. Barton, T. Time budgets and foraging characteristics of lactating Antarctic fur seals |
author_facet |
Boyd, I.L. Lunn, N.J. Barton, T. |
author_sort |
Boyd, I.L. |
title |
Time budgets and foraging characteristics of lactating Antarctic fur seals |
title_short |
Time budgets and foraging characteristics of lactating Antarctic fur seals |
title_full |
Time budgets and foraging characteristics of lactating Antarctic fur seals |
title_fullStr |
Time budgets and foraging characteristics of lactating Antarctic fur seals |
title_full_unstemmed |
Time budgets and foraging characteristics of lactating Antarctic fur seals |
title_sort |
time budgets and foraging characteristics of lactating antarctic fur seals |
publisher |
British Ecological Society |
publishDate |
1991 |
url |
http://nora.nerc.ac.uk/id/eprint/519658/ https://doi.org/10.2307/5299 |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
geographic |
Antarctic Bird Island |
geographic_facet |
Antarctic Bird Island |
genre |
Antarc* Antarctic Antarctic Fur Seals Bird Island |
genre_facet |
Antarc* Antarctic Antarctic Fur Seals Bird Island |
op_relation |
Boyd, I.L.; Lunn, N.J.; Barton, T. 1991 Time budgets and foraging characteristics of lactating Antarctic fur seals. The Journal of Animal Ecology, 60 (2). 577-592. https://doi.org/10.2307/5299 <https://doi.org/10.2307/5299> |
op_doi |
https://doi.org/10.2307/5299 |
container_title |
The Journal of Animal Ecology |
container_volume |
60 |
container_issue |
2 |
container_start_page |
577 |
_version_ |
1766251752990965760 |