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Age-specific breeding success in a wild mammalian population: selection, constraint, restraint and senescence

Dugdale, Hannah L, Pope, Lisa C, Newman, Chris, Macdonald, David W and Burke, Terry (2011) Age-specific breeding success in a wild mammalian population: selection, constraint, restraint and senescence. Molecular Ecology. ISSN 1365-294X

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Abstract

The Selection, Constraint, Restraint and Senescence Hypotheses predict how breeding success should vary with age. The Selection Hypothesis predicts between-individual variation arising from quality differences; the other hypotheses predict within-individual variation due to differing skills or physiological condition (Constraint), residual reproductive lifespan (Restraint), or somatic and reproductive investment (Senescence). Studies tend to focus on either the initial increase in breeding success or later decrease; however, both require consideration when unravelling the underlying evolutionary processes. Additionally, few studies present genetic fitness measures and rarely for both sexes. We therefore test these four hypotheses, which are not mutually exclusive, in a high-density population of European badgers Meles meles. Using an 18-year data set (including 22 microsatellite loci), we show an initial improvement in breeding success with age, followed by a later and steeper rate of reproductive senescence in male than in female badgers. Breeding success was skewed within age-classes, indicating the influence of factors other than age-class. This was partly attributable to selective appearance and disappearance of badgers (Selection Hypothesis). Individuals with a late age of last breeding showed a concave-down relationship between breeding success and experience (Constraint Hypothesis). There was no evidence of abrupt terminal effects; rather, individuals showed a concave-down relationship between breeding success and residual reproductive lifespan (Restraint Hypothesis), with an interaction with age of first breeding only in female badgers. Our results demonstrate the importance of investigating a comprehensive suite of factors in age-specific breeding success analyses, in both sexes, to fully understand evolutionary and population dynamics.

Item Type: Article
Copyright, Publisher and Additional Information: This is the submitted version of the manuscript MEC-11-0123 "Dugdale HL, Pope LC, Newman C, Macdonald DW, Burke T (2011) Age-specific breeding success in a wild mammalian population: selection, constraint, restraint, and senescence. Molecular Ecology.", which has been published in final form at http://dx.doi.org/10.1111/j.1365-294X.2011.05167.x
Keywords: age-specific breeding success, constraint hypothesis, Meles meles, restraint hypothesis, selective disappearance, senescence
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > School of Biological Sciences (Sheffield) > Department of Animal and Plant Sciences (Sheffield)
Depositing User: Dr Hannah Dugdale
Date Deposited: 05 Jul 2011 12:13
Last Modified: 08 Feb 2013 17:32
Published Version: http://dx.doi.org/10.1111/j.1365-294X.2011.05167.x
Status: Published
Publisher: Blackwell Publishing
Refereed: Yes
Identification Number: 10.1111/j.1365-294X.2011.05167.x
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/43112

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