How Important Is Sexual Isolation to Speciation?

Hybridization in birds-of-paradise: Widespread ancestral gene flow despite strong sexual selection in a lek-mating system

“… 4 Sexual selection, for example, can expedite the build-up of reproductive isolation if sexual traits differentiate rapidly during the early stages of species formation. 6 Similarly, during the latter stages, reinforcement following secondary contact can accelerate reproductive isolation between divergent lineages. The notion that sexual selection can reduce the probability of hybridization is widely supported, and sexual selection has long been considered as a catalyst for speciation across plants and animals.…”