The avian bill is a textbook example of how evolution shapes morphology in response to
changing environments. Bills of seed‐specialist finches in particular have been the focus of …

Mountain ecosystems support a significant one‐third of all terrestrial biodiversity, but our
understanding of the spatiotemporal maintenance of this high biodiversity remains poor, or …

Given the availability of genomic data to identify separately evolving groups of organisms,
many researchers establish species limits based on assessments of the extent of gene flow …

Riama is the most speciose genus of the Neotropical lizard family Gymnophthalmidae. Its
more than 30 montane species occur throughout the northern Andes, the Cordillera de la …

Population divergence leading to speciation is often explained by physical barriers causing
allopatric distributions of historically connected populations. Environmental barriers have …

We studied the phylogeny, biogeography, and diversification of suboscine passerines in the
genus Scytalopus (Rhinocryptidae), a widespread, species-rich, and taxonomically …

During the process of ecological speciation, reproductive isolation results from divergent
natural selection and leads to a positive correlation between genetic divergence and …

Aim Allen's rule posits that the appendages of endothermic organisms will be larger in
warmer climates to allow for dumping of heat loads. Given a link between appendage size …

Closely related species with parapatric elevational ranges are ubiquitous in tropical
mountains worldwide. The gradient speciation hypothesis proposes that these series are the …

Aim To assess geographical and temporal patterns of diversification in Metallura
hummingbirds, particularly with respect to topographical barriers and climatic variation …