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The degree to which closely related species interbreed is determined by a complex interaction of ecological, behavioral, and genetic factors. We examine the degree of interbreeding between two woodrat species, Neotoma bryanti and N. lepida, at a sharp ecological transition. We identify the ecological association of each genotypic class, assess the opportunity for mating between these groups, and test...
A hybrid zone is a region where interbreeding occurs between two or more genetically distinct populations. Recent studies have shown that mammalian hybrid zones occur in nature more frequently than previously thought.I summarize the history of research on mammalian hybrid zones, highlighting contributions that demonstrate genetic, behavioural and environmental mechanisms responsible for spatial distribution...
Interspecific morphological variation in animal genitalia has long attracted the attention of evolutionary biologists because of the role genital form may play in the generation and/or maintenance of species boundaries. Here we examine the origin and evolution of genital variation in rodents of the muroid genus Neotoma. We test the hypothesis that a relatively rare genital form has evolved only once...
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