Adaptation to marginal habitats: contrasting influence of the dispersal rate on the fate of alleles with small and large effects.

Abstract excerpt

The focus of this paper is the relationship between the dispersal rate and the conditions for invasion of a rare allele that improves performance in a marginal sink habitat at the expense of reducing fitness in the main source habitat. Classic multiple-niche population-genetic models predict that the conditions for the invasion of such an allele always become more favourable as the dispersal rate decreases....

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