Many recent studies provide evidence for assortative mating resulting from adaptive divergence, and thus support a strong role for ecology in speciation. It has also become clear that the evolutionary divergence of signals plays an important role in assortative mating, insofar as signal divergence facilitates reproductive isolation. We have argued here that, in some cases, phenotypic divergence can drive, as an incidental by-product, the biomechanics of display behavior and the structure of associated signals, and thus augment the likelihood of ecological speciation.

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