The impact of reproductive investment and early-life environmental conditions on senescence: support for the disposable soma hypothesis

Hammers, M., Richardson, D. S. ORCID:, Burke, T. and Komdeur, J. (2013) The impact of reproductive investment and early-life environmental conditions on senescence: support for the disposable soma hypothesis. Journal of Evolutionary Biology, 26 (9). pp. 1999-2007. ISSN 1010-061X

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Several hypotheses have been put forward to explain the evolution of senescence. One of the leading hypotheses, the disposable soma hypothesis, predicts a trade-off, whereby early-life investment in reproduction leads to late-life declines in survival (survival senescence). Testing this hypothesis in natural populations is challenging, but important for understanding the evolution of senescence. We used the long-term data set from a contained, predator-free population of individually marked Seychelles warblers (Acrocephalus sechellensis) to investigate how age-related declines in survival are affected by early-life investment in reproduction and early-life environmental conditions. The disposable soma hypothesis predicts that higher investment in reproduction, or experiencing harsh conditions during early life, will lead to an earlier onset, and an increased rate, of senescence. We found that both sexes showed similar age-related declines in late-life survival consistent with senescence. Individuals that started breeding at a later age showed a delay in survival senescence, but this later onset of breeding did not result in a less rapid decline in late-life survival. Although survival senescence was not directly related to early-life environmental conditions, age of first breeding increased with natal food availability. Therefore, early-life food availability may affect senescence by influencing age of first breeding. The disposable soma hypothesis of senescence is supported by delayed senescence in individuals that started breeding at a later age and therefore invested less in reproduction.

Item Type: Article
Additional Information: © 2013 The Authors. Journal of Evolutionary Biology © 2013 European Society For Evolutionary Biology.
Uncontrolled Keywords: acrocephalus sechellensis,ageing,antagonistic pleiotropy,disposable soma,early-life investment,life-history trade-off,seychelles warbler,survival senescence
Faculty \ School: Faculty of Science > School of Biological Sciences
UEA Research Groups: Faculty of Science > Research Groups > Molecular Microbiology
Faculty of Science > Research Groups > Organisms and the Environment
Faculty of Science > Research Centres > Centre for Molecular and Structural Biochemistry
Depositing User: Pure Connector
Date Deposited: 11 Nov 2013 15:22
Last Modified: 17 May 2023 00:56
DOI: 10.1111/jeb.2013.26.issue-9

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