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

A central role for sexual isolation in the formation of new species and establishment of
species boundaries has been noticed since Darwin and is frequently emphasized in the …

Measuring reproductive barriers between groups of organisms is an effective way to
determine the traits and mechanisms that impede gene flow. However, to understand the …

Adaptation to salinity affects species distributions, promotes speciation, and guides many
evolutionary patterns in fishes. To uncover the basis of a complex trait like osmoregulation …

Understanding general principles about the origin of species remains one of the
foundational challenges in evolutionary biology. The genomic divergence between groups …

Reinforcement occurs when behavioral isolation is strengthened between species due to
selection against hybridization in sympatry. Mate preferences and their target traits may …

Adaptation to different environments can directly and indirectly generate reproductive
isolation between species. Bluefin killifish (Lucania goodei) and rainwater killifish (L. parva) …

Background To understand which reproductive barriers initiate speciation is a major
question in evolutionary research. Despite their high species numbers and specific biology …

The interaction between floral traits and reproductive isolation is crucial to explaining the
extraordinary diversity of angiosperms. Heterostyly, a complex floral polymorphism that …

Recent advances in molecular technologies have revealed cryptic species across many
marine zooplankton taxa. However, the patterns and drivers of cryptic divergence are …