Patterns of age‐related change in reproductive effort differ in the pre‐natal and post‐natal periods in a long‐lived mammal
Summary Age‐related changes in maternal reproductive allocation for long‐lived species are a key prediction from life‐history theory. Theoretical and empirical work suggests that allocation may increase with age due to constraint (increases with experience) or restraint (increases with age in the fa...
Published in: | Journal of Animal Ecology |
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Online Access: | http://dx.doi.org/10.1111/1365-2656.12577 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2656.12577 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2656.12577 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2656.12577 https://besjournals.onlinelibrary.wiley.com/doi/am-pdf/10.1111/1365-2656.12577 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2656.12577 |
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crwiley:10.1111/1365-2656.12577 2024-09-09T20:13:18+00:00 Patterns of age‐related change in reproductive effort differ in the pre‐natal and post‐natal periods in a long‐lived mammal Paterson, John T. Rotella, Jay J. Mannas, Jennifer M. Garrott, Robert A. Gaillard, Jean‐Michel National Science Foundation Division of Polar Programs National Science Foundation 2016 http://dx.doi.org/10.1111/1365-2656.12577 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2656.12577 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2656.12577 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2656.12577 https://besjournals.onlinelibrary.wiley.com/doi/am-pdf/10.1111/1365-2656.12577 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2656.12577 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Animal Ecology volume 85, issue 6, page 1540-1551 ISSN 0021-8790 1365-2656 journal-article 2016 crwiley https://doi.org/10.1111/1365-2656.12577 2024-08-22T04:16:46Z Summary Age‐related changes in maternal reproductive allocation for long‐lived species are a key prediction from life‐history theory. Theoretical and empirical work suggests that allocation may increase with age due to constraint (increases with experience) or restraint (increases with age in the face of declining residual reproductive value), and may decrease among the oldest aged animals due to senescence in reproductive function. Here, we use a hierarchical modelling approach to investigate the age‐related patterns of change in maternal reproductive effort in the Weddell seal, a long‐lived marine mammal with a protracted period of maternal care during which mothers allocate a large proportion of body mass while feeding little. We find that maternal allocation increases with age for young mothers during both the pre‐natal and post‐natal periods. In contrast, older mothers demonstrate a senescent decline in pre‐natal allocation but allocate more of their declining resources to their offspring during the post‐natal period. We also find strong evidence for the importance of individual effects in reproductive allocation among mothers: some mothers consistently produce heavier (or lighter) pups than expected. Our results indicate that maternal allocation changes over a mother's reproductive life span and that age‐specific differences differ in notable ways in pre‐natal and post‐natal periods. Article in Journal/Newspaper Weddell Seal Wiley Online Library Weddell Journal of Animal Ecology 85 6 1540 1551 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Summary Age‐related changes in maternal reproductive allocation for long‐lived species are a key prediction from life‐history theory. Theoretical and empirical work suggests that allocation may increase with age due to constraint (increases with experience) or restraint (increases with age in the face of declining residual reproductive value), and may decrease among the oldest aged animals due to senescence in reproductive function. Here, we use a hierarchical modelling approach to investigate the age‐related patterns of change in maternal reproductive effort in the Weddell seal, a long‐lived marine mammal with a protracted period of maternal care during which mothers allocate a large proportion of body mass while feeding little. We find that maternal allocation increases with age for young mothers during both the pre‐natal and post‐natal periods. In contrast, older mothers demonstrate a senescent decline in pre‐natal allocation but allocate more of their declining resources to their offspring during the post‐natal period. We also find strong evidence for the importance of individual effects in reproductive allocation among mothers: some mothers consistently produce heavier (or lighter) pups than expected. Our results indicate that maternal allocation changes over a mother's reproductive life span and that age‐specific differences differ in notable ways in pre‐natal and post‐natal periods. |
author2 |
Gaillard, Jean‐Michel National Science Foundation Division of Polar Programs National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Paterson, John T. Rotella, Jay J. Mannas, Jennifer M. Garrott, Robert A. |
spellingShingle |
Paterson, John T. Rotella, Jay J. Mannas, Jennifer M. Garrott, Robert A. Patterns of age‐related change in reproductive effort differ in the pre‐natal and post‐natal periods in a long‐lived mammal |
author_facet |
Paterson, John T. Rotella, Jay J. Mannas, Jennifer M. Garrott, Robert A. |
author_sort |
Paterson, John T. |
title |
Patterns of age‐related change in reproductive effort differ in the pre‐natal and post‐natal periods in a long‐lived mammal |
title_short |
Patterns of age‐related change in reproductive effort differ in the pre‐natal and post‐natal periods in a long‐lived mammal |
title_full |
Patterns of age‐related change in reproductive effort differ in the pre‐natal and post‐natal periods in a long‐lived mammal |
title_fullStr |
Patterns of age‐related change in reproductive effort differ in the pre‐natal and post‐natal periods in a long‐lived mammal |
title_full_unstemmed |
Patterns of age‐related change in reproductive effort differ in the pre‐natal and post‐natal periods in a long‐lived mammal |
title_sort |
patterns of age‐related change in reproductive effort differ in the pre‐natal and post‐natal periods in a long‐lived mammal |
publisher |
Wiley |
publishDate |
2016 |
url |
http://dx.doi.org/10.1111/1365-2656.12577 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2656.12577 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2656.12577 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2656.12577 https://besjournals.onlinelibrary.wiley.com/doi/am-pdf/10.1111/1365-2656.12577 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2656.12577 |
geographic |
Weddell |
geographic_facet |
Weddell |
genre |
Weddell Seal |
genre_facet |
Weddell Seal |
op_source |
Journal of Animal Ecology volume 85, issue 6, page 1540-1551 ISSN 0021-8790 1365-2656 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/1365-2656.12577 |
container_title |
Journal of Animal Ecology |
container_volume |
85 |
container_issue |
6 |
container_start_page |
1540 |
op_container_end_page |
1551 |
_version_ |
1809815002154008576 |