Speciation, the evolution of reproductive isolation among populations, is continuous,
complex, and involves multiple, interacting barriers. Until it is complete, the effects of this …

As populations diverge, genetic differences accumulate across the genome. Spurred by
rapid developments in sequencing technology, genome-wide population surveys of natural …

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 …

The transition from 'well-marked varieties' of a single species into 'well-defined species'—
especially in the absence of geographic barriers to gene flow (sympatric speciation)—has …

Coupling has emerged as a concept to describe the transition from differentiated
populations to newly evolved species through the strengthening of reproductive isolation …

During the process of speciation, populations may diverge for traits and at their underlying
loci that contribute barriers to gene flow. These barrier traits and barrier loci underlie …

The repeated adaptation of oceanic threespine sticklebacks to fresh water has made it a
premier organism to study parallel evolution. These small fish have multiple distinct …

Genomic comparisons of closely related species have identified “islands” of locally elevated
sequence divergence. Genomic islands may contain functional variants involved in local …

Most new cryptic species are described using conventional tree‐and distance‐based
species delimitation methods (SDMs), which rely on phylogenetic arrangements and …

A major goal of evolutionary biology is to identify the genotypes and phenotypes that
underlie adaptation to divergent environments. Stickleback fish, including the threespine …