Sexual isolation and extreme morphological divergence in the Cumaná guppy: a possible case of incipient speciation
H. J. ALEXANDER & F. BREDEN
Department of Biological Sciences, Simon Fraser University, Burnaby, Canada
Abstract Theory predicts that sexual selection can promote the evolution of reproductive isolation and speciation. Those cases in which sexual selection has led to speciation should be characterized by significant differentiation in male Display traits and correlated female preferences in the absence of post-zygotic isolation, accompanied by little genetic or other morphological differentiation.