Hybridization has many and varied impacts on the process of speciation. Hybridization may
slow or reverse differentiation by allowing gene flow and recombination. It may accelerate …

Sexual selection has a reputation as a major cause of speciation, one of the most potent forces
driving reproductive isolation. This reputation arises from observations that species differ …

Speciation has been a major focus of evolutionary biology research in recent years, with many
important advances. However, some of the traditional organising principles of the subject …

… Henry Rae and Hilary Ritchie gave invaluable help with the bushcrickets, and Andy
Snedden, Iain Couzin, Jenny Gleason, and Mark Kirkpatrick provided useful discussion and …

… Jones 1993; MG Ritchie, personal observations). The playback techniques typically used
with D. melanogaster are of necessity rather crude, which militates against detecting weak …

… paulistorum is considered a classic example of character displacement (Ehrman 1965), but
our sampling does not allow comparison of their songs (Ritchie and Gleason 1995). Overall, …

Acoustic signals produced by males are often subject to sexual selection. The mechanism of
song production in crickets is well documented. Cricket songs are said to be characterised …

… Roger Butlin works on the evolution and genetics of pre- and postzygotic reproductive
isolation, whereas Mike Ritchie limits himself to premating isolation and population genetics. …

The earliest stages of convergent evolution are difficult to observe in the wild, limiting our
understanding of the incipient genomic architecture underlying convergent phenotypes [1, 2]. …

Genetic coupling and coevolution of male and female components have been seen as
alternative solutions to the problem of maintaining coordination between the sexes during …