Evol Ecol Res 6: 481-502 (2004)     Full PDF if your library subscribes.

Kin selection models for the co-evolution of the sex ratio and sex-specific dispersal

Geoff Wild and Peter D. Taylor*

Department of Mathematics and Statistics, Queen’s University, Kingston, Ontario K7L 3N6, Canada

Author to whom all correspondence should be addressed.
e-mail: taylorp@post.queensu.ca


We investigate the co-evolutionary relationship between sex-ratio bias and sex-specific dispersal behaviour using an inclusive fitness approach. We consider two models: (i) DDM, in which dispersal of both sexes occurs before mating; and (ii) DMD, in which male dispersal precedes mating and female dispersal follows mating. Under DDM, at equilibrium, there is no bias in either the sex ratio or the sex-specific dispersal rates unless the sex-specific dispersal costs are different. However, under DMD, and at equilibrium, equal sex-specific dispersal costs imply a female bias in the sex ratio and a female dispersal rate at least as great as that of males. The present work highlights the role of sex differences – in either dispersal costs or the timing of dispersal – to the co-evolution of the sex ratio and dispersal.

Keywords: co-evolution, inclusive fitness, kin selection, local competition, sex ratio, sex-specific dispersal, stability.

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        © 2004 Peter D. Taylor. All EER articles are copyrighted by their authors. All authors endorse, permit and license Evolutionary Ecology Ltd. to grant its subscribing institutions/libraries the copying privileges specified below without additional consideration or payment to them or to Evolutionary Ecology, Ltd. These endorsements, in writing, are on file in the office of Evolutionary Ecology, Ltd. Consult authors for permission to use any portion of their work in derivative works, compilations or to distribute their work in any commercial manner.

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