Evolutionary Ecology

, 21:229

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

Authors

    • Department of Biological SciencesUniversity of Wales Swansea
    • Gatty Marine InstituteUniversity of St. Andrews
  • Carlos García de Leániz
    • Department of Biological SciencesUniversity of Wales Swansea
Original Paper

DOI: 10.1007/s10682-006-9001-7

Cite this article as:
Consuegra, S. & García de Leániz, C. Evol Ecol (2007) 21: 229. doi:10.1007/s10682-006-9001-7

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.

Keywords

Sex ratios Sex-biased dispersal Asymmetric gene flow mtDNA Microsatellites Atlantic salmon Metapopulation

Copyright information

© Springer Science+Business Media B.V. 2006