The Robertson lab focuses on understanding microevolutionary processes that underlie population differentiation. We integrate studies of population genetics and phylogeography with behavior to examine the roles of selection and gene flow on shaping phenotypic diversification. We are also interested in the strength and precedence of multiple forms of reproductive isolation (premating, mechanical, postzygotic) for populations that exhibit early-stage genetic and phenotypic diversification (see Research on Red-eyed treefrogs below).