Interannual variation in survival of juvenile Weddell seals ( Leptonychotes weddellii ) from McMurdo Sound, Antarctica: effects of cohort, sex and age
Abstract Survival of juvenile Weddell seals Leptonychotes weddellii in McMurdo Sound, Antarctica was examined using 25 years of tagging and resighting data. Using mark–recapture models, we estimated age‐ and sex‐specific apparent survival (survival confounded with emigration) rates of Weddell seals...
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Online Access: | http://dx.doi.org/10.1111/j.1469-7998.1999.tb01031.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1999.tb01031.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1999.tb01031.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1999.tb01031.x |
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crwiley:10.1111/j.1469-7998.1999.tb01031.x 2023-12-03T10:13:38+01:00 Interannual variation in survival of juvenile Weddell seals ( Leptonychotes weddellii ) from McMurdo Sound, Antarctica: effects of cohort, sex and age Hastings, K. K. Testa, J. W. Rexstad, E. A. 1999 http://dx.doi.org/10.1111/j.1469-7998.1999.tb01031.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1999.tb01031.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1999.tb01031.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1999.tb01031.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Zoology volume 248, issue 3, page 307-323 ISSN 0952-8369 1469-7998 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1999 crwiley https://doi.org/10.1111/j.1469-7998.1999.tb01031.x 2023-11-09T14:06:38Z Abstract Survival of juvenile Weddell seals Leptonychotes weddellii in McMurdo Sound, Antarctica was examined using 25 years of tagging and resighting data. Using mark–recapture models, we estimated age‐ and sex‐specific apparent survival (survival confounded with emigration) rates of Weddell seals from birth to 6 years of age for 17 cohorts (1973–89). Survival in the first 2 years of life (0.429 and 0.635 for the first and second years, respectively) was lower than annual survival after 2 years of age (0.806), and was significantly lower for males than for females. First‐year survival of the 1978 and 1983 cohorts was significantly lower than average first‐year survival across cohorts. Reproductive rate of adult females was significantly correlated with first‐year survival in concurrent years, but not when first‐year survival lagged reproductive rate by 1 year nor with annual survival after 1 year of age. This correlation, however, was only significant in male first‐year survival, possibly indicating that survival of males is more dependent on maternal or environmental conditions than survival of females. Average weaning mass varied significantly among cohorts and was nearly correlated to reproductive rate of adult females. This may indicate that maternal condition is reduced in years of low reproduction although more data are needed to test this conclusively. Article in Journal/Newspaper Antarc* Antarctica McMurdo Sound Weddell Seals Wiley Online Library (via Crossref) McMurdo Sound Weddell Journal of Zoology 248 3 307 323 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Hastings, K. K. Testa, J. W. Rexstad, E. A. Interannual variation in survival of juvenile Weddell seals ( Leptonychotes weddellii ) from McMurdo Sound, Antarctica: effects of cohort, sex and age |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Abstract Survival of juvenile Weddell seals Leptonychotes weddellii in McMurdo Sound, Antarctica was examined using 25 years of tagging and resighting data. Using mark–recapture models, we estimated age‐ and sex‐specific apparent survival (survival confounded with emigration) rates of Weddell seals from birth to 6 years of age for 17 cohorts (1973–89). Survival in the first 2 years of life (0.429 and 0.635 for the first and second years, respectively) was lower than annual survival after 2 years of age (0.806), and was significantly lower for males than for females. First‐year survival of the 1978 and 1983 cohorts was significantly lower than average first‐year survival across cohorts. Reproductive rate of adult females was significantly correlated with first‐year survival in concurrent years, but not when first‐year survival lagged reproductive rate by 1 year nor with annual survival after 1 year of age. This correlation, however, was only significant in male first‐year survival, possibly indicating that survival of males is more dependent on maternal or environmental conditions than survival of females. Average weaning mass varied significantly among cohorts and was nearly correlated to reproductive rate of adult females. This may indicate that maternal condition is reduced in years of low reproduction although more data are needed to test this conclusively. |
format |
Article in Journal/Newspaper |
author |
Hastings, K. K. Testa, J. W. Rexstad, E. A. |
author_facet |
Hastings, K. K. Testa, J. W. Rexstad, E. A. |
author_sort |
Hastings, K. K. |
title |
Interannual variation in survival of juvenile Weddell seals ( Leptonychotes weddellii ) from McMurdo Sound, Antarctica: effects of cohort, sex and age |
title_short |
Interannual variation in survival of juvenile Weddell seals ( Leptonychotes weddellii ) from McMurdo Sound, Antarctica: effects of cohort, sex and age |
title_full |
Interannual variation in survival of juvenile Weddell seals ( Leptonychotes weddellii ) from McMurdo Sound, Antarctica: effects of cohort, sex and age |
title_fullStr |
Interannual variation in survival of juvenile Weddell seals ( Leptonychotes weddellii ) from McMurdo Sound, Antarctica: effects of cohort, sex and age |
title_full_unstemmed |
Interannual variation in survival of juvenile Weddell seals ( Leptonychotes weddellii ) from McMurdo Sound, Antarctica: effects of cohort, sex and age |
title_sort |
interannual variation in survival of juvenile weddell seals ( leptonychotes weddellii ) from mcmurdo sound, antarctica: effects of cohort, sex and age |
publisher |
Wiley |
publishDate |
1999 |
url |
http://dx.doi.org/10.1111/j.1469-7998.1999.tb01031.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1999.tb01031.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1999.tb01031.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1999.tb01031.x |
geographic |
McMurdo Sound Weddell |
geographic_facet |
McMurdo Sound Weddell |
genre |
Antarc* Antarctica McMurdo Sound Weddell Seals |
genre_facet |
Antarc* Antarctica McMurdo Sound Weddell Seals |
op_source |
Journal of Zoology volume 248, issue 3, page 307-323 ISSN 0952-8369 1469-7998 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1469-7998.1999.tb01031.x |
container_title |
Journal of Zoology |
container_volume |
248 |
container_issue |
3 |
container_start_page |
307 |
op_container_end_page |
323 |
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1784260462386348032 |