Combining nuclear (nuDNA) and mitochondrial DNA (mtDNA) markers has improved the
power of molecular data to test phylogenetic and phylogeographic hypotheses and has …

Hybridization between species is commonplace in plants, but is often seen as unnatural and
unusual in animals. Here, I survey studies of natural interspecific hybridization in plants and …

Charles Darwin's experiences in the Galápagos Islands in 1835 helped to guide his
thoughts toward a revolutionary theory: that species were not fixed but diversified from their …

Research into differences in introgression potential among autosomal, sex-linked, and
mtDNA loci is an active field of inquiry in both model and non-model species. At the same …

Hybrid zones are 'natural laboratories' for studying the origin, maintenance and demise of
species. Theory predicts that hybrid zones can move in space and time, with significant …

The premise that Pleistocene ice ages played an important role in generating present–day
species diversity has been challenged by genetic data indicating that most of the youngest …

A subspecies is a collection of populations within a biological species that are diagnosably
distinct from other such collections of populations. That infraspecific designation has …

In the absence of nuclear-genomic differentiation between two populations, deep
mitochondrial divergence (DMD) is a form of mito-nuclear discordance. Such instances of …

The study of zones of secondary contact provides insight into the maintenance of
reproductive isolation. Tension zone theory supplies powerful tools for assessing how …

The birds in the family Parulidae—commonly termed the New World warblers or wood-
warblers—are a classic model radiation for studies of ecological and behavioral …