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A long-standing goal of speciation research is to describe how reproductive isolating barriers develop, when they arise along the ‘speciation continuum’, and to measure the strength with which they restrict gene flow. Drosophila arizonae and D. mojavensis are a recently diverged sister species pair distributed from the southwestern United States through southern Mexico. While incipient speciation...
The diversity of body sizes observed among species of a clade is a combined result of microevolutionary processes (i.e. natural selection and genetic drift) that cause size changes within phylogenetic lineages, and macroevolutionary processes (i.e. speciation and extinction) that affect net rates of diversification among lineages. Here we assess trends of size diversity and evolution in fishes (non-tetrapod...
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