Diving behaviour of lactating Antarctic fur seals
The diving behaviour of 11 lactating female Antarctic fur seals (Arctocephalus gazella) was recorded for a total of 254 animal-days at sea. Median and maximum dive depths for individuals varied from 8 to 19 m and from 82 to 181 m, respectively, and median and maximum dive durations from 0.75 to 1.17...
Published in: | Canadian Journal of Zoology |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1992
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/z92-131 http://www.nrcresearchpress.com/doi/pdf/10.1139/z92-131 |
id |
crcansciencepubl:10.1139/z92-131 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/z92-131 2024-09-09T19:11:13+00:00 Diving behaviour of lactating Antarctic fur seals Boyd, I. L. Croxall, J. P. 1992 http://dx.doi.org/10.1139/z92-131 http://www.nrcresearchpress.com/doi/pdf/10.1139/z92-131 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 70, issue 5, page 919-928 ISSN 0008-4301 1480-3283 journal-article 1992 crcansciencepubl https://doi.org/10.1139/z92-131 2024-07-04T04:09:59Z The diving behaviour of 11 lactating female Antarctic fur seals (Arctocephalus gazella) was recorded for a total of 254 animal-days at sea. Median and maximum dive depths for individuals varied from 8 to 19 m and from 82 to 181 m, respectively, and median and maximum dive durations from 0.75 to 1.17 min and from 2.8–10.0 min, respectively. Theoretical aerobic diving limits were exceeded on < 1% of dives. Dives were mainly V-shaped. Sixty percent of dives were to less than 20 m depth, and these dives were distinguished from deep dives (> 20 m) by having slower rates of descent and ascent and by being confined to the mixed layer at the ocean surface, as judged by records of sea temperature obtained concurrently with records of depth. Dives were grouped into bouts, defined by inflexion points observed in the cumulative probability distribution of surface interval after probit transformation. Bouts (defined by preceding and succeeding surface intervals lasting 13–24 min) occurred within a diel pattern of diving activity, with 74–85% of dives occurring at night. The pattern of diving, in terms of division into bouts, showed greater differences between individual seals than did dive depth and duration. Dives tended to be shorter and shallower later in lactation. Most variation in diving behaviour between individuals was in terms of the proportion of available time spent foraging, bout frequency, and bout duration. The foraging strategy in the Antarctic fur seal is geared to exploiting prey within the surface mixed layer. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Arctocephalus gazella Canadian Science Publishing Antarctic The Antarctic Canadian Journal of Zoology 70 5 919 928 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
The diving behaviour of 11 lactating female Antarctic fur seals (Arctocephalus gazella) was recorded for a total of 254 animal-days at sea. Median and maximum dive depths for individuals varied from 8 to 19 m and from 82 to 181 m, respectively, and median and maximum dive durations from 0.75 to 1.17 min and from 2.8–10.0 min, respectively. Theoretical aerobic diving limits were exceeded on < 1% of dives. Dives were mainly V-shaped. Sixty percent of dives were to less than 20 m depth, and these dives were distinguished from deep dives (> 20 m) by having slower rates of descent and ascent and by being confined to the mixed layer at the ocean surface, as judged by records of sea temperature obtained concurrently with records of depth. Dives were grouped into bouts, defined by inflexion points observed in the cumulative probability distribution of surface interval after probit transformation. Bouts (defined by preceding and succeeding surface intervals lasting 13–24 min) occurred within a diel pattern of diving activity, with 74–85% of dives occurring at night. The pattern of diving, in terms of division into bouts, showed greater differences between individual seals than did dive depth and duration. Dives tended to be shorter and shallower later in lactation. Most variation in diving behaviour between individuals was in terms of the proportion of available time spent foraging, bout frequency, and bout duration. The foraging strategy in the Antarctic fur seal is geared to exploiting prey within the surface mixed layer. |
format |
Article in Journal/Newspaper |
author |
Boyd, I. L. Croxall, J. P. |
spellingShingle |
Boyd, I. L. Croxall, J. P. Diving behaviour of lactating Antarctic fur seals |
author_facet |
Boyd, I. L. Croxall, J. P. |
author_sort |
Boyd, I. L. |
title |
Diving behaviour of lactating Antarctic fur seals |
title_short |
Diving behaviour of lactating Antarctic fur seals |
title_full |
Diving behaviour of lactating Antarctic fur seals |
title_fullStr |
Diving behaviour of lactating Antarctic fur seals |
title_full_unstemmed |
Diving behaviour of lactating Antarctic fur seals |
title_sort |
diving behaviour of lactating antarctic fur seals |
publisher |
Canadian Science Publishing |
publishDate |
1992 |
url |
http://dx.doi.org/10.1139/z92-131 http://www.nrcresearchpress.com/doi/pdf/10.1139/z92-131 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Arctocephalus gazella |
genre_facet |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Arctocephalus gazella |
op_source |
Canadian Journal of Zoology volume 70, issue 5, page 919-928 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z92-131 |
container_title |
Canadian Journal of Zoology |
container_volume |
70 |
container_issue |
5 |
container_start_page |
919 |
op_container_end_page |
928 |
_version_ |
1809826930046795776 |