Budding dispersal and the sex ratio |
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Authors: | Gardner A Arce A Alpedrinha J |
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Affiliation: | Institute of Evolutionary Biology, University of Edinburgh, West Mains Road, Edinburgh, UK. andy.gardner@ed.ac.uk |
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Abstract: | There is much interest in understanding how population demography impacts upon social evolution. Here, we consider the impact of rate and pattern of dispersal upon a classic social evolutionary trait--the sex ratio. We recover existing analytical results for individual dispersal, and we extend these to allow for budding dispersal. In particular, while a cancelling of relatedness and kin competition effects means that the sex ratio is unaffected by the rate of individual dispersal, we find that a decoupling of relatedness and kin competition means that budding dispersal favours increasingly female-biased sex ratios. More generally, our analysis illustrates the relative ease with which biological problems involving class structure can be solved using a kin selection approach to social evolution theory. |
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Keywords: | class structure group selection inclusive fitness kin selection local mate competition relatedness reproductive value scale of competition sex allocation viscous population |
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