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Fluctuating sex ratios, but no sex-biased dispersal, in a promiscuous fish

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Abstract

Dispersal in birds and mammals tends to be female-biased in monogamous species and male-biased in polygamous species. However results for other taxa, most notably fish, are equivocal. We employed molecular markers and physical tags to test the hypothesis that Atlantic salmon, a promiscuous species with intense male-male competition for access to females, displays male-biased dispersal. We found significant variation in sex ratios and in asymmetric gene flow between neighbouring salmon populations, but little or no evidence for sex-biased dispersal. We show that conditions favouring male dispersal will often be offset by those favouring female dispersal, and that spatial and temporal variation in sex ratios within a metapopulation may favour the dispersal of different sexes in source and sink habitats. Thus, our results reconcile previous discrepancies on salmonid dispersal and highlight the need to consider metapopulation dynamics and sex ratios in the study of natal dispersal of highly fecund species.

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Acknowledgements

We thank A. Serdio and the Cantabrian wildlife bailiffs for help with the collection of samples, and Pat Lee, Craig Primmer and four anonymous reviewers for helpful comments that greatly improved the manuscript. S. Consuegra was supported by the Fundacion Marcelino Botin.

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Consuegra, S., García de Leániz, C. Fluctuating sex ratios, but no sex-biased dispersal, in a promiscuous fish. Evol Ecol 21, 229–245 (2007). https://doi.org/10.1007/s10682-006-9001-7

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