Data from: Parallel evolution of local adaptation and reproductive isolation in the face of gene flow

Roger K. Butlin, Maria Saura, Grégory Charrier, Benjamin Jackson, Carl André, Armando Caballero, Jerry A. Coyne, Juan Galindo, John W. Grahame, Johann Hollander, Petri Kemppainen, Mónica Martínez-Fernández, Marina Panova, Humberto Quesada, Kerstin Johannesson, Emilio Rolán-Alvarez & Johan Hollander
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...

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