The species concept is the cornerstone of biodiversity science, and any paradigm shift in the
delimitation of species affects many research fields. Many biologists now are embracing a …

Sexual selection plays several intricate and complex roles in the related processes of local
adaptation and speciation. In some cases sexual selection can promote these processes …

A primary roadblock to our understanding of speciation is that it usually occurs over a
timeframe that is too long to study from start to finish. The idea of a speciation continuum …

Homoploid hybrid speciation in animals has been inferred frequently from patterns of
variation, but few examples have withstood critical scrutiny. Here we report a directly …

By formalizing the relationship between genotype or phenotype and fitness, fitness
landscapes harbor information on molecular and evolutionary constraints. The shape of the …

The “multispecies” coalescent (MSC) model that underlies many genomic species-
delimitation approaches is problematic because it does not distinguish between genetic …

INTRODUCTION Organisms in the early stages of speciation provide an opportunity to
understand the processes that govern reproductive isolation between taxa. Ecological or …

Much of what we know about speciation comes from detailed studies of well‐known model
systems. Although there have been several important syntheses on speciation, few (if any) …

About 100 km east of Rome, in the central Apennine Mountains, a critically endangered
population of∼ 50 brown bears live in complete isolation. Mating outside this population is …

Mitochondrial genes are widely used in taxonomy and systematics because high mutation
rates lead to rapid sequence divergence and because such changes have long been …