Age structure, growth, and demographic parameters in breeding-age female subantarctic fur seals, Arctocephalus tropicalis
Age distribution was estimated for 108 breeding-age female subantarctic fur seals, Arctocephalus tropicalis (Gray, 1872), sampled during the 1999–2000 breeding season on Amsterdam Island, southern Indian Ocean. The growth features were described and demographic parameters assessed from transversal l...
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2004
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Online Access: | http://dx.doi.org/10.1139/z04-079 http://www.nrcresearchpress.com/doi/pdf/10.1139/z04-079 |
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crcansciencepubl:10.1139/z04-079 2024-03-03T08:36:35+00:00 Age structure, growth, and demographic parameters in breeding-age female subantarctic fur seals, Arctocephalus tropicalis Dabin, Willy Beauplet, Gwénaël Crespo, Enrique A Guinet, Christophe 2004 http://dx.doi.org/10.1139/z04-079 http://www.nrcresearchpress.com/doi/pdf/10.1139/z04-079 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 82, issue 7, page 1043-1050 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2004 crcansciencepubl https://doi.org/10.1139/z04-079 2024-02-07T10:53:32Z Age distribution was estimated for 108 breeding-age female subantarctic fur seals, Arctocephalus tropicalis (Gray, 1872), sampled during the 1999–2000 breeding season on Amsterdam Island, southern Indian Ocean. The growth features were described and demographic parameters assessed from transversal life tables constructed for this female population. The breeding females had a longer mean body length than was observed for other breeding populations of the same species. These females also showed a later start to reproduction (6 years old), a lower overall age-specific reproductive rate (R 6–16 = 48.0%), and a lower survival in older age classes (>13 years). Females reproduced up to a maximum age of 16 years, with none older than 19 years observed in the colony, suggesting an apparent senescence in the population. This consequently reduced the theoretical reproductive period of the females, which has led to a lower number of reproductive outputs per individual (i.e., 3.65 weaned pups per female throughout its reproductive life). Although such differences between islands may be related to genotypic traits, these results are consistent with low food availability and suggest that density-dependent regulatory processes operate on the Amsterdam Island population. Article in Journal/Newspaper Amsterdam Island Canadian Science Publishing Indian Canadian Journal of Zoology 82 7 1043 1050 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Dabin, Willy Beauplet, Gwénaël Crespo, Enrique A Guinet, Christophe Age structure, growth, and demographic parameters in breeding-age female subantarctic fur seals, Arctocephalus tropicalis |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Age distribution was estimated for 108 breeding-age female subantarctic fur seals, Arctocephalus tropicalis (Gray, 1872), sampled during the 1999–2000 breeding season on Amsterdam Island, southern Indian Ocean. The growth features were described and demographic parameters assessed from transversal life tables constructed for this female population. The breeding females had a longer mean body length than was observed for other breeding populations of the same species. These females also showed a later start to reproduction (6 years old), a lower overall age-specific reproductive rate (R 6–16 = 48.0%), and a lower survival in older age classes (>13 years). Females reproduced up to a maximum age of 16 years, with none older than 19 years observed in the colony, suggesting an apparent senescence in the population. This consequently reduced the theoretical reproductive period of the females, which has led to a lower number of reproductive outputs per individual (i.e., 3.65 weaned pups per female throughout its reproductive life). Although such differences between islands may be related to genotypic traits, these results are consistent with low food availability and suggest that density-dependent regulatory processes operate on the Amsterdam Island population. |
format |
Article in Journal/Newspaper |
author |
Dabin, Willy Beauplet, Gwénaël Crespo, Enrique A Guinet, Christophe |
author_facet |
Dabin, Willy Beauplet, Gwénaël Crespo, Enrique A Guinet, Christophe |
author_sort |
Dabin, Willy |
title |
Age structure, growth, and demographic parameters in breeding-age female subantarctic fur seals, Arctocephalus tropicalis |
title_short |
Age structure, growth, and demographic parameters in breeding-age female subantarctic fur seals, Arctocephalus tropicalis |
title_full |
Age structure, growth, and demographic parameters in breeding-age female subantarctic fur seals, Arctocephalus tropicalis |
title_fullStr |
Age structure, growth, and demographic parameters in breeding-age female subantarctic fur seals, Arctocephalus tropicalis |
title_full_unstemmed |
Age structure, growth, and demographic parameters in breeding-age female subantarctic fur seals, Arctocephalus tropicalis |
title_sort |
age structure, growth, and demographic parameters in breeding-age female subantarctic fur seals, arctocephalus tropicalis |
publisher |
Canadian Science Publishing |
publishDate |
2004 |
url |
http://dx.doi.org/10.1139/z04-079 http://www.nrcresearchpress.com/doi/pdf/10.1139/z04-079 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Amsterdam Island |
genre_facet |
Amsterdam Island |
op_source |
Canadian Journal of Zoology volume 82, issue 7, page 1043-1050 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z04-079 |
container_title |
Canadian Journal of Zoology |
container_volume |
82 |
container_issue |
7 |
container_start_page |
1043 |
op_container_end_page |
1050 |
_version_ |
1792494315337940992 |