The effects of body size and climate on post‐weaning survival of elephant seals at <scp>H</scp>eard <scp>I</scp>sland
Abstract The population size of southern elephant seals in the southern I ndian and P acific O ceans decreased precipitously between the 1950s and 1990s. To investigate the reasons behind this, we studied the population of southern elephant seals at H eard I sland between 1949 and 1954, using data c...
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Online Access: | http://dx.doi.org/10.1111/jzo.12279 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjzo.12279 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jzo.12279 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jzo.12279 https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/jzo.12279 |
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crwiley:10.1111/jzo.12279 2023-12-03T10:22:05+01:00 The effects of body size and climate on post‐weaning survival of elephant seals at <scp>H</scp>eard <scp>I</scp>sland McMahon, C. R. New, L. F. Fairley, E. J. Hindell, M. A. Burton, H. R. 2015 http://dx.doi.org/10.1111/jzo.12279 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjzo.12279 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jzo.12279 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jzo.12279 https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/jzo.12279 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Zoology volume 297, issue 4, page 301-308 ISSN 0952-8369 1469-7998 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2015 crwiley https://doi.org/10.1111/jzo.12279 2023-11-09T13:20:26Z Abstract The population size of southern elephant seals in the southern I ndian and P acific O ceans decreased precipitously between the 1950s and 1990s. To investigate the reasons behind this, we studied the population of southern elephant seals at H eard I sland between 1949 and 1954, using data collected by the early A ustralian N ational A ntarctic R esearch E xpeditions. Seals were marked and measured (lengths) as weaned pups, and resighted at H eard and M arion islands and in the V estfold H ills, A ntarctica in subsequent years. B ayesian state‐space mark‐recapture models were used to determine post‐weaning survival. Yearling survival was consistently lower (ϕy: 0.28–0.40) than sub‐adult survival (ϕs: 0.79–0.83). We found evidence for constant sub‐adult survival and time‐dependent resight probabilities. Weaning length was an important determinate of yearling survival, with the probability of survival increasing with individual length. There was some suggestion that the S outhern A nnular M ode influenced yearling survival but this evidence was not strong. Nonetheless, our results provide further support showing that size at independence affects yearling survival. Given the known sensitivity of southern elephant seal populations to survival early in life, it is possible that the decline in population size at H eard I sland between the 1950s and 1990s like that at M acquarie I sland was due to low yearling survival mediated through maternal ability to produce large pups and the dominant environmental conditions mothers experience during pregnancy. Article in Journal/Newspaper Elephant Seal Elephant Seals Southern Elephant Seal Southern Elephant Seals Wiley Online Library (via Crossref) Journal of Zoology 297 4 301 308 |
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 McMahon, C. R. New, L. F. Fairley, E. J. Hindell, M. A. Burton, H. R. The effects of body size and climate on post‐weaning survival of elephant seals at <scp>H</scp>eard <scp>I</scp>sland |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Abstract The population size of southern elephant seals in the southern I ndian and P acific O ceans decreased precipitously between the 1950s and 1990s. To investigate the reasons behind this, we studied the population of southern elephant seals at H eard I sland between 1949 and 1954, using data collected by the early A ustralian N ational A ntarctic R esearch E xpeditions. Seals were marked and measured (lengths) as weaned pups, and resighted at H eard and M arion islands and in the V estfold H ills, A ntarctica in subsequent years. B ayesian state‐space mark‐recapture models were used to determine post‐weaning survival. Yearling survival was consistently lower (ϕy: 0.28–0.40) than sub‐adult survival (ϕs: 0.79–0.83). We found evidence for constant sub‐adult survival and time‐dependent resight probabilities. Weaning length was an important determinate of yearling survival, with the probability of survival increasing with individual length. There was some suggestion that the S outhern A nnular M ode influenced yearling survival but this evidence was not strong. Nonetheless, our results provide further support showing that size at independence affects yearling survival. Given the known sensitivity of southern elephant seal populations to survival early in life, it is possible that the decline in population size at H eard I sland between the 1950s and 1990s like that at M acquarie I sland was due to low yearling survival mediated through maternal ability to produce large pups and the dominant environmental conditions mothers experience during pregnancy. |
format |
Article in Journal/Newspaper |
author |
McMahon, C. R. New, L. F. Fairley, E. J. Hindell, M. A. Burton, H. R. |
author_facet |
McMahon, C. R. New, L. F. Fairley, E. J. Hindell, M. A. Burton, H. R. |
author_sort |
McMahon, C. R. |
title |
The effects of body size and climate on post‐weaning survival of elephant seals at <scp>H</scp>eard <scp>I</scp>sland |
title_short |
The effects of body size and climate on post‐weaning survival of elephant seals at <scp>H</scp>eard <scp>I</scp>sland |
title_full |
The effects of body size and climate on post‐weaning survival of elephant seals at <scp>H</scp>eard <scp>I</scp>sland |
title_fullStr |
The effects of body size and climate on post‐weaning survival of elephant seals at <scp>H</scp>eard <scp>I</scp>sland |
title_full_unstemmed |
The effects of body size and climate on post‐weaning survival of elephant seals at <scp>H</scp>eard <scp>I</scp>sland |
title_sort |
effects of body size and climate on post‐weaning survival of elephant seals at <scp>h</scp>eard <scp>i</scp>sland |
publisher |
Wiley |
publishDate |
2015 |
url |
http://dx.doi.org/10.1111/jzo.12279 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjzo.12279 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jzo.12279 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jzo.12279 https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/jzo.12279 |
genre |
Elephant Seal Elephant Seals Southern Elephant Seal Southern Elephant Seals |
genre_facet |
Elephant Seal Elephant Seals Southern Elephant Seal Southern Elephant Seals |
op_source |
Journal of Zoology volume 297, issue 4, page 301-308 ISSN 0952-8369 1469-7998 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/jzo.12279 |
container_title |
Journal of Zoology |
container_volume |
297 |
container_issue |
4 |
container_start_page |
301 |
op_container_end_page |
308 |
_version_ |
1784269917822910464 |