Speciation is characterized by the evolution of reproductive isolation between two groups of
organisms. Understanding the process of speciation requires the quantification of barriers to …

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 …

Understanding the evolution of reproductive isolation is tantamount to describing the origin
of species. Therefore, a primary goal in evolutionary biology is to identify which reproductive …

The divergent genital morphology observed among closely related animal species has long
been posited as a mechanism of reproductive isolation. Despite the intuitive appeal that …

Abstract Haldane's Rule (HR), which states that 'when in the offspring of two different animal
races one sex is absent, rare, or sterile, that sex is the heterozygous (heterogametic) sex', is …

To understand how new species form and what causes their collapse, we examined how
reproductive isolation evolves during the speciation process, considering species pairs with …

Phylogenies of closely related animal species are often inferred using mitochondrial DNA
(mtDNA) gene sequences. The accuracy of mtDNA gene trees is compromised through …

One of the longest debates in biology has been over the relative importance of different
isolating barriers in speciation. However, for most species, there are few data evaluating …

The geographic ranges of rhesus (Macaca mulatta) and cynomolgus (M. fascicularis)
macaques adjoin in Indochina where they appear to hybridize. We used published and …

Body size differences among coexisting related species are common, but the actual effect of
these differences in mitigating interspecific interactions, such as resource competition and …