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Sex-specific spatio-temporal variability in reproductive success promotes the evolution of sex-biased dispersal

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sbd_competition_tpb.pdf
(Postprint), 162KB

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Zitation

Gros, A., Poethke, H. J., & Hovestadt, T. (2009). Sex-specific spatio-temporal variability in reproductive success promotes the evolution of sex-biased dispersal. Theoretical Population Biology, 76, 13-18. doi:10.1016/j.tpb.2009.03.002.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0013-7A6B-0
Zusammenfassung
Inbreeding depression, asymmetries in costs or benefits of dispersal, and the mating system have been identified as potential factors underlying the evolution of sex- biased dispersal. We use individual-based simulations to explore how the mating system and demographic stochasticity influence the evolution of sex-specific dispersal in a metapopulation with females competing over breeding sites, and males over mating opportunities. Comparison of simulation results for random mating with those for a harem system (locally, a single male sires all offspring) reveal that even extreme variance in local male reproductive success (extreme male competition) does not induce male-biased dispersal. The latter evolves if between-patch variance in reproductive success is larger for males than females. This can emerge due to demographic stochasticity if habitat patches are small. More generally, members of a group of individuals experiencing higher spatio-temporal variance in fitness expectations may evolve to disperse with greater probability than others.