Roger K. Butlin

TL;DR: In this paper, the role of the allelic content in determining the long-term fate of the inversion was quantified and the authors highlighted the dynamic features of inversions by showing how the non-adaptive evolution of allele content can play a major role in the fate of inversion.

TL;DR: The presence or absence of an active NOR on the X chromosome was used to analyse the hybrid zones in two different transects of the Pyrenees, and clear clines of X NOR frequencies were observed passing from Cp.

TL;DR: A new study by Via and West (2008) on speciation between host races of the pea aphid introduces the mechanism of ‘divergence hitchhiking’ which can generate large ‘islands of differentiation’ and facilitate the build‐up of linkage disequilibrium, favouring increased reproductive isolation.

TL;DR: The frequency of sib dyads among juveniles within shoals was significantly larger than that between shoals in two high predation populations but not in two lowpredation populations, contributing to the understanding of factors underlying shoal composition.

TL;DR: A two‐dimensional cline is fitted to variation in male calling song characters, which are of particular interest as they are likely to be involved in mate choice by females and the fitted width of the cline for song characters is significantly narrower than for peg number, suggesting that mating signals may be associated with reduced hybrid fitness in the field.