Explaining broad molecular, phenotypic and species biodiversity patterns necessitates a
unifying framework spanning multiple evolutionary scales. Here we argue that although …

Intrinsic postzygotic barriers can play an important and multifaceted role in speciation, but
their contribution is often thought to be reserved to the final stages of the speciation process …

Genomic data are rapidly resolving the tree of living species calibrated to time, the timetree
of life, which will provide a framework for research in diverse fields of science. Previous …

The number of species on Earth is one of the most fundamental numbers in science, but one
that remains highly uncertain. Clearly, more species exist than the present number of …

Global patterns of biodiversity are influenced by spatial and environmental variations in the
rate at which new species form. We relate variations in speciation rates to six key patterns of …

The origin, distribution, and function of biological diversity are fundamental themes of
ecology and evolutionary biology. Research on birds has played a major role in the history …

Ecologists often view community assembly as a process involving the dispersal of species
from a static regional species pool followed by environmental filtering to establish the local …

Speciation generally involves a three-step process—range expansion, range fragmentation
and the development of reproductive isolation between spatially separated populations …

Explaining variation in species richness among provinces and other large geographic
regions remains one of the most challenging problems at the intersection of ecology and …

Introgressive hybridization challenges the concepts we use to define species and infer
phylogenetic relationships. Methods for inferring historical introgression from the genomes …