Variation in the vital rates of an Antarctic marine predator: the role of individual heterogeneity
Abstract Variation in life‐history traits such as lifespan and lifetime reproductive output is thought to arise, in part, due to among‐individual differences in the underlying probabilities of survival and reproduction. However, the stochastic nature of demographic processes can also generate consid...
Published in: | Ecology |
---|---|
Main Authors: | , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2018
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/ecy.2481 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fecy.2481 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ecy.2481 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ecy.2481 http://api.wiley.com/onlinelibrary/chorus/v1/articles/10.1002%2Fecy.2481 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.1002/ecy.2481 |
id |
crwiley:10.1002/ecy.2481 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/ecy.2481 2024-09-30T14:26:04+00:00 Variation in the vital rates of an Antarctic marine predator: the role of individual heterogeneity Paterson, J. Terrill Rotella, Jay. J. Link, William A. Garrott, Robert National Science Foundation Division of Polar Programs 2018 http://dx.doi.org/10.1002/ecy.2481 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fecy.2481 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ecy.2481 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ecy.2481 http://api.wiley.com/onlinelibrary/chorus/v1/articles/10.1002%2Fecy.2481 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.1002/ecy.2481 en eng Wiley http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ Ecology volume 99, issue 10, page 2385-2396 ISSN 0012-9658 1939-9170 journal-article 2018 crwiley https://doi.org/10.1002/ecy.2481 2024-09-05T05:07:46Z Abstract Variation in life‐history traits such as lifespan and lifetime reproductive output is thought to arise, in part, due to among‐individual differences in the underlying probabilities of survival and reproduction. However, the stochastic nature of demographic processes can also generate considerable variation in fitness‐related traits among otherwise‐identical individuals. An improved understanding of life‐history evolution and population dynamics therefore depends on evaluating the relative role of each of these processes. Here, we used a 33‐yr data set with reproductive histories for 1,274 female Weddell seals from Erebus Bay, Antarctica, to assess the strength of evidence for among‐individual heterogeneity in the probabilities of survival and reproduction, while accounting for multiple other sources of variation in vital rates. Our analysis used recent advances in Bayesian model selection techniques and diagnostics to directly compare model fit and predictive power between models that included individual effects on survival and reproduction to those that did not. We found strong evidence for costs of reproduction to both survival and future reproduction, with breeders having rates of survival and subsequent reproduction that were 3% and 6% lower than rates for non‐breeders. We detected age‐related changes in the rates of survival and reproduction, but the patterns differed for the two rates. Survival rates steadily declined from 0.92 at age 7 to 0.56 at the maximal age of 31 yr. In contrast, reproductive rates increased from 0.68 at age 7 to 0.79 at age 16 and then steadily declined to 0.37 for the oldest females. Models that included individual effects explained more variation in observed life histories and had better estimated predictive power than those that did not, indicating their importance in understanding sources of variation among individuals in life‐history traits. We found that among‐individual heterogeneity in survival was small relative to that for reproduction. Our study, which found ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Weddell Seals Wiley Online Library Antarctic Weddell Erebus Bay ENVELOPE(166.517,166.517,-77.733,-77.733) Ecology 99 10 2385 2396 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Variation in life‐history traits such as lifespan and lifetime reproductive output is thought to arise, in part, due to among‐individual differences in the underlying probabilities of survival and reproduction. However, the stochastic nature of demographic processes can also generate considerable variation in fitness‐related traits among otherwise‐identical individuals. An improved understanding of life‐history evolution and population dynamics therefore depends on evaluating the relative role of each of these processes. Here, we used a 33‐yr data set with reproductive histories for 1,274 female Weddell seals from Erebus Bay, Antarctica, to assess the strength of evidence for among‐individual heterogeneity in the probabilities of survival and reproduction, while accounting for multiple other sources of variation in vital rates. Our analysis used recent advances in Bayesian model selection techniques and diagnostics to directly compare model fit and predictive power between models that included individual effects on survival and reproduction to those that did not. We found strong evidence for costs of reproduction to both survival and future reproduction, with breeders having rates of survival and subsequent reproduction that were 3% and 6% lower than rates for non‐breeders. We detected age‐related changes in the rates of survival and reproduction, but the patterns differed for the two rates. Survival rates steadily declined from 0.92 at age 7 to 0.56 at the maximal age of 31 yr. In contrast, reproductive rates increased from 0.68 at age 7 to 0.79 at age 16 and then steadily declined to 0.37 for the oldest females. Models that included individual effects explained more variation in observed life histories and had better estimated predictive power than those that did not, indicating their importance in understanding sources of variation among individuals in life‐history traits. We found that among‐individual heterogeneity in survival was small relative to that for reproduction. Our study, which found ... |
author2 |
National Science Foundation Division of Polar Programs |
format |
Article in Journal/Newspaper |
author |
Paterson, J. Terrill Rotella, Jay. J. Link, William A. Garrott, Robert |
spellingShingle |
Paterson, J. Terrill Rotella, Jay. J. Link, William A. Garrott, Robert Variation in the vital rates of an Antarctic marine predator: the role of individual heterogeneity |
author_facet |
Paterson, J. Terrill Rotella, Jay. J. Link, William A. Garrott, Robert |
author_sort |
Paterson, J. Terrill |
title |
Variation in the vital rates of an Antarctic marine predator: the role of individual heterogeneity |
title_short |
Variation in the vital rates of an Antarctic marine predator: the role of individual heterogeneity |
title_full |
Variation in the vital rates of an Antarctic marine predator: the role of individual heterogeneity |
title_fullStr |
Variation in the vital rates of an Antarctic marine predator: the role of individual heterogeneity |
title_full_unstemmed |
Variation in the vital rates of an Antarctic marine predator: the role of individual heterogeneity |
title_sort |
variation in the vital rates of an antarctic marine predator: the role of individual heterogeneity |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1002/ecy.2481 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fecy.2481 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ecy.2481 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ecy.2481 http://api.wiley.com/onlinelibrary/chorus/v1/articles/10.1002%2Fecy.2481 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.1002/ecy.2481 |
long_lat |
ENVELOPE(166.517,166.517,-77.733,-77.733) |
geographic |
Antarctic Weddell Erebus Bay |
geographic_facet |
Antarctic Weddell Erebus Bay |
genre |
Antarc* Antarctic Antarctica Weddell Seals |
genre_facet |
Antarc* Antarctic Antarctica Weddell Seals |
op_source |
Ecology volume 99, issue 10, page 2385-2396 ISSN 0012-9658 1939-9170 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/ecy.2481 |
container_title |
Ecology |
container_volume |
99 |
container_issue |
10 |
container_start_page |
2385 |
op_container_end_page |
2396 |
_version_ |
1811646571712872448 |