Ecologically mediated selection against hybrids, caused by hybrid phenotypes fitting poorly
into available niches, is typically viewed as distinct from selection caused by epistatic …

Highlights•The genomic landscape of introgression carries information about the fitness
consequences of hybridisation.•Studies are moving from documenting single examples to …

To investigate the consequences of hybridization between species, we studied three
replicate hybrid populations that formed naturally between two swordtail fish species …

The evolution of reproductive barriers is the first step in the formation of new species and
can help us understand the diversification of life on Earth. These reproductive barriers often …

Hybridization and its consequences have been of longstanding interest to evolutionary
biologists. Darwin (1859) included a chapter on hybrids and the expression and causes of …

The establishment of reproductive barriers between populations can fuel the evolution of
new species. A genetic framework for this process posits that “incompatible” interactions …

As is true of virtually every realm of the biological sciences, our understanding of speciation
is increasingly informed by the genomic revolution of the past decade. Investigators can ask …

Hybrid incompatibilities occur when interactions between opposite ancestry alleles at
different loci reduce the fitness of hybrids. Most work on incompatibilities has focused on …

Until recently, our understanding of the genetics of speciation was limited to a narrow group
of model species with a specific set of characteristics that made genetic analysis feasible …

Gene exchange between species can influence ecological and evolutionary processes
ranging from population rescue to adaptive radiation. Genomic tools have provided new …