How barriers to gene flow arise and are maintained are key questions in evolutionary
biology. Speciation research has mainly focused on barriers that occur either before mating …

Genome-scale sequence data have invigorated the study of hybridization and introgression,
particularly in animals. However, outside of a few notable cases, we lack systematic tests for …

Females of many different species often mate with multiple males, creating opportunities for
competition among their sperm. Although originally unappreciated, sperm competition is …

Understanding the processes of population divergence and speciation remains a core
question in evolutionary biology. For nearly a hundred years evolutionary geneticists have …

Partial prezygotic isolation is often viewed as more important than partial postzygotic
isolation (low fitness of hybrids) early in the process of speciation. I simulate secondary …

Maternally transmitted Wolbachia infect about half of insect species, yet the predominant
mode (s) of Wolbachia acquisition remains uncertain. Species-specific associations could …

The process of speciation involves populations diverging over time until they are genetically
and reproductively isolated. Hybridization between nascent species was long thought to …

'Species' are central to understanding the origin and dynamics of biological diversity;
explaining why lineages split into multiple distinct species is one of the main goals of …

The mitonuclear compatibility species concept defines a species as a population that is
genetically isolated from other populations by uniquely coadapted mitochondrial (mt) and …

In this article, Matute et al. report an experiment in which they generated eight interspecific
admixed populations using two species pairs of Drosophila. They found that in both species …