A central role for sexual isolation in the formation of new species and establishment of
species boundaries has been noticed since Darwin and is frequently emphasized in the …

Secondary sympatry amongst sister lineages is strongly associated with genetic and
ecological divergence. This pattern suggests that for closely related species to coexist in …

Eco-morphology and ornamentation are two phenotypic dimensions along which co-existing
species often diverge, yet theory makes contrasting predictions about how these phenotypes …

The dark-eyed junco (Junco hyemalis) is one of the most common passerines of North
America, and has served as a model organism in studies related to ecophysiology, behavior …

Colonization of a novel environment by a few individuals can lead to rapid evolutionary
change, yet there is scarce evidence of the relative contributions of neutral and selective …

Local adaptation to environmental heterogeneity across a landscape can result in
population divergence and formation of lineages. On Guadeloupe Island, the active volcano …

Ancestral character-state reconstruction is a powerful method in phylogenetics that can be
applied to elucidate the evolutionary history of secondary sexual characters. Here, we …

Migration is the primary strategy that temperate birds use to avoid overwintering under harsh
conditions. As a consequence, migratory birds have evolved specific morphological features …