Behavioral changes, such as those involved in mating, foraging, and migration, can
generate reproductive barriers between populations. Birds, in particular, are known for their …

Human activities by altering environmental conditions are influencing the mate choice of
animals. This is by impacts on:(i) the production and expression of traits evaluated by mate …

Sexual selection arises from competition among individuals for access to mates, resulting in
the evolution of conspicuous sexually selected traits, especially when inter‐sexual …

Biologists have long debated the evolution of animal ornamentation via female choice. Much
of the discussion of ornament evolution has focused on three hypotheses: the species …

Abstract Barn Swallows (Hirundo rustica), a group of passerine birds comprised of six
closely related subspecies, are well known throughout their nearly worldwide distribution, in …

Abstract Theory predicts that sexual selection can serve as an important driver of speciation,
but phylogenetic comparative analyses have failed to demonstrate a consistent effect of …

Population divergence in geographic isolation is due to a combination of factors. Natural
and sexual selection may be important in shaping patterns of population differentiation, a …

Signal traits are often linked with the physiological state and behavior of their bearer. Direct
examination of the causal links among these variables has provided substantial insight into …

Previous studies have shown that sexual signals can rapidly diverge among closely related
species. However, we lack experimental studies to demonstrate that differences in trait …

Sex chromosomes often bear distinct patterns of genetic variation due to unique patterns of
inheritance and demography. The processes of mutation, recombination, genetic drift and …