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Speciation: Evolutionary studies of speciation employ two main approaches: divergence population genetics, and genetic mapping of trait differences. We are employing both approaches in the genus Boechera, which contains more than 50 diploid species in Western North America. We are mapping genetic differences influencing life history and developmental differences between species. In addition, patterns of nucleotide polymorphism within and between species allow us to infer demographic histories during the speciation process. This information will be combined with analyses of habitat differentiation across elevation gradients in the northern Rocky Mountains in order to understand the ecological and evolutionary processes influencing speciation in this genetically tractable experimental system.
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