Karin S. Pfennig

TL;DR: A perspective on the context and evolutionary significance of hybridization during speciation is offered, highlighting issues of current interest and debate and suggesting that the Dobzhansky–Muller model of hybrid incompatibilities requires a broader interpretation.

TL;DR: Understanding how organisms respond to competitive and reproductive interactions with heterospecifics offers key insights into the evolutionary causes and consequences of species coexistence and diversification.

TL;DR: Female spadefoot toads were more likely to choose heterospecific males when exposed to environmental conditions that favor hybridization, suggesting that females may radically alter their mate selection in response to their own phenotype and their environment, even to the point of choosing males of other species.

TL;DR: This video shows how to avoid look-alikes of venomous snakes when the real thing is around, as well as how to spot them when they are not.

TL;DR: The empirical support for Darwin’s principle of divergence of character is examined, specifically that (1) competition promotes divergent trait evolution, (2) the strength of competitively mediated divergent selection increases with increasing phenotypic similarity between competitors, (3) divergence can occur within species, and (4)competitively mediated divergence can trigger speciation.