Evaluating the importance of individual heterogeneity in reproduction to Weddell seal population dynamics using integral projection models
Abstract Identifying and accounting for unobserved individual heterogeneity in vital rates in demographic models is important for estimating population‐level vital rates and identifying diverse life‐history strategies, but much less is known about how this individual heterogeneity influences populat...
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Online Access: | http://dx.doi.org/10.1111/1365-2656.13975 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2656.13975 |
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crwiley:10.1111/1365-2656.13975 2024-06-02T08:15:46+00:00 Evaluating the importance of individual heterogeneity in reproduction to Weddell seal population dynamics using integral projection models Macdonald, Kaitlin R. Rotella, Jay J. Paterson, J. Terrill 2023 http://dx.doi.org/10.1111/1365-2656.13975 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2656.13975 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Journal of Animal Ecology volume 92, issue 9, page 1828-1839 ISSN 0021-8790 1365-2656 journal-article 2023 crwiley https://doi.org/10.1111/1365-2656.13975 2024-05-03T11:59:19Z Abstract Identifying and accounting for unobserved individual heterogeneity in vital rates in demographic models is important for estimating population‐level vital rates and identifying diverse life‐history strategies, but much less is known about how this individual heterogeneity influences population dynamics. We aimed to understand how the distribution of individual heterogeneity in reproductive and survival rates influenced population dynamics using vital rates from a Weddell seal population by altering the distribution of individual heterogeneity in reproduction, which also altered the distribution of individual survival rates through the incorporation of our estimate of the correlation between the two rates and assessing resulting changes in population growth. We constructed an integral projection model (IPM) structured by age and reproductive state using estimates of vital rates for a long‐lived mammal that has recently been shown to exhibit large individual heterogeneity in reproduction. Using output from the IPM, we evaluated how population dynamics changed with different underlying distributions of unobserved individual heterogeneity in reproduction. Results indicate that the changes to the underlying distribution of individual heterogeneity in reproduction cause very small changes in the population growth rate and other population metrics. The largest difference in the estimated population growth rate resulting from changes to the underlying distribution of individual heterogeneity was less than 1%. Our work highlights the differing importance of individual heterogeneity at the population level compared to the individual level. Although individual heterogeneity in reproduction may result in large differences in the lifetime fitness of individuals, changing the proportion of above‐ or below‐average breeders in the population results in much smaller differences in annual population growth rate. For a long‐lived mammal with stable and high adult‐survival that gives birth to a single offspring, individual ... Article in Journal/Newspaper Weddell Seal Wiley Online Library Weddell Journal of Animal Ecology 92 9 1828 1839 |
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Abstract Identifying and accounting for unobserved individual heterogeneity in vital rates in demographic models is important for estimating population‐level vital rates and identifying diverse life‐history strategies, but much less is known about how this individual heterogeneity influences population dynamics. We aimed to understand how the distribution of individual heterogeneity in reproductive and survival rates influenced population dynamics using vital rates from a Weddell seal population by altering the distribution of individual heterogeneity in reproduction, which also altered the distribution of individual survival rates through the incorporation of our estimate of the correlation between the two rates and assessing resulting changes in population growth. We constructed an integral projection model (IPM) structured by age and reproductive state using estimates of vital rates for a long‐lived mammal that has recently been shown to exhibit large individual heterogeneity in reproduction. Using output from the IPM, we evaluated how population dynamics changed with different underlying distributions of unobserved individual heterogeneity in reproduction. Results indicate that the changes to the underlying distribution of individual heterogeneity in reproduction cause very small changes in the population growth rate and other population metrics. The largest difference in the estimated population growth rate resulting from changes to the underlying distribution of individual heterogeneity was less than 1%. Our work highlights the differing importance of individual heterogeneity at the population level compared to the individual level. Although individual heterogeneity in reproduction may result in large differences in the lifetime fitness of individuals, changing the proportion of above‐ or below‐average breeders in the population results in much smaller differences in annual population growth rate. For a long‐lived mammal with stable and high adult‐survival that gives birth to a single offspring, individual ... |
format |
Article in Journal/Newspaper |
author |
Macdonald, Kaitlin R. Rotella, Jay J. Paterson, J. Terrill |
spellingShingle |
Macdonald, Kaitlin R. Rotella, Jay J. Paterson, J. Terrill Evaluating the importance of individual heterogeneity in reproduction to Weddell seal population dynamics using integral projection models |
author_facet |
Macdonald, Kaitlin R. Rotella, Jay J. Paterson, J. Terrill |
author_sort |
Macdonald, Kaitlin R. |
title |
Evaluating the importance of individual heterogeneity in reproduction to Weddell seal population dynamics using integral projection models |
title_short |
Evaluating the importance of individual heterogeneity in reproduction to Weddell seal population dynamics using integral projection models |
title_full |
Evaluating the importance of individual heterogeneity in reproduction to Weddell seal population dynamics using integral projection models |
title_fullStr |
Evaluating the importance of individual heterogeneity in reproduction to Weddell seal population dynamics using integral projection models |
title_full_unstemmed |
Evaluating the importance of individual heterogeneity in reproduction to Weddell seal population dynamics using integral projection models |
title_sort |
evaluating the importance of individual heterogeneity in reproduction to weddell seal population dynamics using integral projection models |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1111/1365-2656.13975 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2656.13975 |
geographic |
Weddell |
geographic_facet |
Weddell |
genre |
Weddell Seal |
genre_facet |
Weddell Seal |
op_source |
Journal of Animal Ecology volume 92, issue 9, page 1828-1839 ISSN 0021-8790 1365-2656 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/1365-2656.13975 |
container_title |
Journal of Animal Ecology |
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92 |
container_issue |
9 |
container_start_page |
1828 |
op_container_end_page |
1839 |
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1800740057200459776 |