Juvenile survival and population regulation in southern elephant seals at Marion Island
We examined annual juvenile survival in southern elephant seals (Mirounga leonina) at Marion Island for the period 1994–1999 during which time the population was stable. Using mark–recapture models, we tested for age- and sex-specific differences in survival rates over the first three years of life....
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ftjafricanj:oai:ojs.ajol.info:article/155411 2023-05-15T16:05:27+02:00 Juvenile survival and population regulation in southern elephant seals at Marion Island Pistorius, P.A. Bester, M.N. 2017-05-02 application/pdf https://www.ajol.info/index.php/az/article/view/155411 eng eng NISC (Pty) Ltd https://www.ajol.info/index.php/az/article/view/155411/145035 https://www.ajol.info/index.php/az/article/view/155411 The copyright belongs to the Zoological Society of Southern Africa. African Zoology; Vol 37, No 1 (2002); 35–41 2224-073X 1562-7020 southern elephant seals juvenile survival mark–recapture population regulation info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2017 ftjafricanj 2017-05-06T23:57:24Z We examined annual juvenile survival in southern elephant seals (Mirounga leonina) at Marion Island for the period 1994–1999 during which time the population was stable. Using mark–recapture models, we tested for age- and sex-specific differences in survival rates over the first three years of life. We found that survival was age- but not sex-related and compared our estimates to similar estimates from a previous study on the same population while in a state of decline. This was done to determine whether changes in juvenile survival were instrumental in terminating the population decline at Marion Island. On average, the probability of survival was 59.5 %, 81.4 % and 78.1 % for the first, second and third year respectively. These estimates were remarkably similar to those previously calculated for the population while in a state of decline, and we dismiss juvenile survival as a major population regulating component in southern elephant seals at Marion Island.Keywords: southern elephant seals, juvenile survival, mark–recapture, population regulation. Article in Journal/Newspaper Elephant Seals Marion Island Mirounga leonina Southern Elephant Seals AJOL - African Journals Online |
institution |
Open Polar |
collection |
AJOL - African Journals Online |
op_collection_id |
ftjafricanj |
language |
English |
topic |
southern elephant seals juvenile survival mark–recapture population regulation |
spellingShingle |
southern elephant seals juvenile survival mark–recapture population regulation Pistorius, P.A. Bester, M.N. Juvenile survival and population regulation in southern elephant seals at Marion Island |
topic_facet |
southern elephant seals juvenile survival mark–recapture population regulation |
description |
We examined annual juvenile survival in southern elephant seals (Mirounga leonina) at Marion Island for the period 1994–1999 during which time the population was stable. Using mark–recapture models, we tested for age- and sex-specific differences in survival rates over the first three years of life. We found that survival was age- but not sex-related and compared our estimates to similar estimates from a previous study on the same population while in a state of decline. This was done to determine whether changes in juvenile survival were instrumental in terminating the population decline at Marion Island. On average, the probability of survival was 59.5 %, 81.4 % and 78.1 % for the first, second and third year respectively. These estimates were remarkably similar to those previously calculated for the population while in a state of decline, and we dismiss juvenile survival as a major population regulating component in southern elephant seals at Marion Island.Keywords: southern elephant seals, juvenile survival, mark–recapture, population regulation. |
format |
Article in Journal/Newspaper |
author |
Pistorius, P.A. Bester, M.N. |
author_facet |
Pistorius, P.A. Bester, M.N. |
author_sort |
Pistorius, P.A. |
title |
Juvenile survival and population regulation in southern elephant seals at Marion Island |
title_short |
Juvenile survival and population regulation in southern elephant seals at Marion Island |
title_full |
Juvenile survival and population regulation in southern elephant seals at Marion Island |
title_fullStr |
Juvenile survival and population regulation in southern elephant seals at Marion Island |
title_full_unstemmed |
Juvenile survival and population regulation in southern elephant seals at Marion Island |
title_sort |
juvenile survival and population regulation in southern elephant seals at marion island |
publisher |
NISC (Pty) Ltd |
publishDate |
2017 |
url |
https://www.ajol.info/index.php/az/article/view/155411 |
genre |
Elephant Seals Marion Island Mirounga leonina Southern Elephant Seals |
genre_facet |
Elephant Seals Marion Island Mirounga leonina Southern Elephant Seals |
op_source |
African Zoology; Vol 37, No 1 (2002); 35–41 2224-073X 1562-7020 |
op_relation |
https://www.ajol.info/index.php/az/article/view/155411/145035 https://www.ajol.info/index.php/az/article/view/155411 |
op_rights |
The copyright belongs to the Zoological Society of Southern Africa. |
_version_ |
1766401356388630528 |