Reinforcement and selection against migrants maintain sperm competitive and genetic differences among populations of Drosophila pseudoobscura.

Abstract excerpt

Sexual interactions among closely related species can select for divergence in reproductive traits to avoid the costs of hybridization. This selection, termed 'reinforcement', produces a canonical pattern of stronger isolation in sympatric populations versus in allopatric populations. However, unless there is selection against migrants between geographic contexts, this pattern of stronger sympatric isolation will...

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