Abstract
Models of sexual selection usually assume that variation in the expression of sexual ornaments is determined largely by genetic, rather than environmental, factors1. However, empirical support for this assumption comes from studies of species with little parental care1,2, in which the influence of environmental factors may be limited3,4, and from studies of just two species5,6 with parental care, in both of which heritability estimates vary hugely between years or populations7,8. In the remaining studies of species with parental care, it is not known whether resemblance in sexual ornamentation between relatives was due to shared genes or shared patterns of care3,4,9,10,11,12,13,14,15. Here we use cross-fostering experiments in house sparrows, Passer domesticus, to examine the relative roles of these effects. We demonstrate that, although sons resemble their fathers with respect to sexual ornamentation, this resemblance is mainly due to post-hatching environmental effects rather than shared genes. We also show that sons hatching early in the year have the largest ornaments. These results support models that emphasize the importance of environmental sources of variation16,17,18, such as direct paternal effects4,19,20, on the expression of sexual ornaments, and agree with the general observation that sexually selected traits tend to be condition dependent1. We urge the incorporation of gene–environment interactions into future models of sexual selection.
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Acknowledgements
We thank NERC (UK) for support and the Landmark Trust for permission to work on Lundy; B. Sheldon for help and advice; the Department of Animal Ecology, Uppsala University for support to S.C.G.; the Department of Zoology, University of Oxford for sabbatical hospitality to I.P.F.O; D. Dawson, I. Hartley, A. Møller, A. Pomiankowski, D. Richardson, D. Ross and I. Stewart for help and discussion; and R. Alatalo, M. Andersson, P. Harvey, J. Merila, K. Norris, J. Pemberton, A. Pomiankowski, T. Price and A. Qvarnström for comments on the manuscript.
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Griffith, S., Owens, I. & Burke, T. Environmental determination of a sexually selected trait. Nature 400, 358–360 (1999). https://doi.org/10.1038/22536
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DOI: https://doi.org/10.1038/22536
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