Pup production and distribution of breeding Antarctic fur seals (Arctocephalus gazella) at South Georgia
A census of the breeding population of Antarctic fur seals (Arctocephalus gazella) at South Georgia was carried out during the 1990/91 breeding season. Using counts of adult females ashore at the breeding grounds during the pupping period, together with corrections for the likelihood of a female bei...
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Cambridge University Press
1993
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Online Access: | http://nora.nerc.ac.uk/id/eprint/517594/ https://doi.org/10.1017/S0954102093000045 |
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ftnerc:oai:nora.nerc.ac.uk:517594 2023-05-15T13:49:34+02:00 Pup production and distribution of breeding Antarctic fur seals (Arctocephalus gazella) at South Georgia Boyd, I.L. 1993-03 http://nora.nerc.ac.uk/id/eprint/517594/ https://doi.org/10.1017/S0954102093000045 unknown Cambridge University Press Boyd, I.L. 1993 Pup production and distribution of breeding Antarctic fur seals (Arctocephalus gazella) at South Georgia. Antarctic Science, 5 (01). 17-24. https://doi.org/10.1017/S0954102093000045 <https://doi.org/10.1017/S0954102093000045> Publication - Article PeerReviewed 1993 ftnerc https://doi.org/10.1017/S0954102093000045 2023-02-04T19:45:13Z A census of the breeding population of Antarctic fur seals (Arctocephalus gazella) at South Georgia was carried out during the 1990/91 breeding season. Using counts of adult females ashore at the breeding grounds during the pupping period, together with corrections for the likelihood of a female being ashore at a census and for pregnancy rate (71% in 1990/91), pup production was estimated as 269 000 (95% confidence intervals 188 000-350000). The breeding population in 1990/91 was reduced at long-term study sites probably because of limited food availability. Data from these sites were used to estimate the pup production of the population had 1990/91 been a typical year. Based on values from 1983/84 to 1990/91, pup production in 1990/91 would have been 378000 (se=19100) if it had been an average year. The annual increase in pup production from 1976/77 to 1990/91 has declined to 9.8% since the initial period of population expansion in the 1950s and 1960s. Increased population size has led to an expansion of the breeding range at South Georgia. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seals Antarctic Science Arctocephalus gazella Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Science 5 1 17 24 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
A census of the breeding population of Antarctic fur seals (Arctocephalus gazella) at South Georgia was carried out during the 1990/91 breeding season. Using counts of adult females ashore at the breeding grounds during the pupping period, together with corrections for the likelihood of a female being ashore at a census and for pregnancy rate (71% in 1990/91), pup production was estimated as 269 000 (95% confidence intervals 188 000-350000). The breeding population in 1990/91 was reduced at long-term study sites probably because of limited food availability. Data from these sites were used to estimate the pup production of the population had 1990/91 been a typical year. Based on values from 1983/84 to 1990/91, pup production in 1990/91 would have been 378000 (se=19100) if it had been an average year. The annual increase in pup production from 1976/77 to 1990/91 has declined to 9.8% since the initial period of population expansion in the 1950s and 1960s. Increased population size has led to an expansion of the breeding range at South Georgia. |
format |
Article in Journal/Newspaper |
author |
Boyd, I.L. |
spellingShingle |
Boyd, I.L. Pup production and distribution of breeding Antarctic fur seals (Arctocephalus gazella) at South Georgia |
author_facet |
Boyd, I.L. |
author_sort |
Boyd, I.L. |
title |
Pup production and distribution of breeding Antarctic fur seals (Arctocephalus gazella) at South Georgia |
title_short |
Pup production and distribution of breeding Antarctic fur seals (Arctocephalus gazella) at South Georgia |
title_full |
Pup production and distribution of breeding Antarctic fur seals (Arctocephalus gazella) at South Georgia |
title_fullStr |
Pup production and distribution of breeding Antarctic fur seals (Arctocephalus gazella) at South Georgia |
title_full_unstemmed |
Pup production and distribution of breeding Antarctic fur seals (Arctocephalus gazella) at South Georgia |
title_sort |
pup production and distribution of breeding antarctic fur seals (arctocephalus gazella) at south georgia |
publisher |
Cambridge University Press |
publishDate |
1993 |
url |
http://nora.nerc.ac.uk/id/eprint/517594/ https://doi.org/10.1017/S0954102093000045 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Fur Seals Antarctic Science Arctocephalus gazella |
genre_facet |
Antarc* Antarctic Antarctic Fur Seals Antarctic Science Arctocephalus gazella |
op_relation |
Boyd, I.L. 1993 Pup production and distribution of breeding Antarctic fur seals (Arctocephalus gazella) at South Georgia. Antarctic Science, 5 (01). 17-24. https://doi.org/10.1017/S0954102093000045 <https://doi.org/10.1017/S0954102093000045> |
op_doi |
https://doi.org/10.1017/S0954102093000045 |
container_title |
Antarctic Science |
container_volume |
5 |
container_issue |
1 |
container_start_page |
17 |
op_container_end_page |
24 |
_version_ |
1766251679497322496 |