Abstract
IN many birds, females copulate with males other than their social mate, resulting in extra-pair fertilizations (EPFs)1–7. It is still unknown, however, why females seek EPFs7,8. In one study, males that accounted for most EPFs had higher survival6, but neither the characteristics revealing male quality nor the benefits accruing to females selecting attractive males were identified. Great reed warblers, Acrocephalus arundinaceus, are socially polygynous, and females base their mate choice on territory quality9 and song-repertoire size10, both of which predict harem size and reproductive success11,12. By DNA fingerprinting13, we demonstrate that female great reed warblers obtain EPFs from neighbouring males with larger song repertoires than their social mate. In addition, the relative post-fledging survival of offspring was positively correlated with their genetical fathers' song repertoire size. These data support the hypothesis that females, by engaging in extra-pair fertilizations, seek genetic benefits for their offspring7,8.
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Hasselquist, D., Bensch, S. & von Schantz, T. Correlation between male song repertoire, extra-pair paternity and offspring survival in the great reed warbler. Nature 381, 229–232 (1996). https://doi.org/10.1038/381229a0
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DOI: https://doi.org/10.1038/381229a0
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