The influence of male age on within-pair and extra-pair paternity in passerines

Authors

  • IAN R. CLEASBY,

    Corresponding author
    1. Department of Animal & Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK
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  • SHINICHI NAKAGAWA

    1. Department of Animal & Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK
    2. Department of Zoology, University of Otago, PO Box 56, Dunedin 9054, New Zealand
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*Corresponding author.
Email: i.r.cleasby@gmail.com

Abstract

Although male age has often been found to predict success in gaining extra-pair paternity, it is unclear whether this gain is associated with an individual’s success in avoiding cuckoldry. We examined the relationship between male age and both within- and extra-pair paternity in passerines using a meta-analytical approach. There was a positive correlation between male age and success in extra-pair paternity but little evidence for an association between male age and within-pair paternity. In addition, effect sizes for male within-pair paternity and male extra-pair paternity were not significantly correlated. Thus, factors that predict success in obtaining extra-pair paternity, such as male age, may not necessarily predict success in avoiding cuckoldry.

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