Parallel evolution of local adaptation and reproductive isolation in the face of gene flow.

ABSTRACT: Parallel evolution of similar phenotypes provides strong evidence for the operation of natural selection. Where these phenotypes contribute to reproductive isolation, they further support a role for divergent, habitat-associated selection in speciation. However, the observation of pairs of divergent ecotypes currently occupying contrasting habitats in distinct geographical regions is not sufficient to infer parallel origins. Here we show striking parallel phenotypic divergence between populations of the rocky-shore gastropod, Littorina saxatilis, occupying contrasting habitats exposed to either wave action or crab predation. This divergence is associated with barriers to gene exchange but, nevertheless, genetic variation is more strongly structured by geography than by ecotype. Using appro

SUBMITTER: Butlin RK 

PROVIDER: S-EPMC4261988 | biostudies-literature | 2014 Apr

REPOSITORIES: biostudies-literature