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Mimulus guttatus and M. nasutus are an evolutionary and ecological modelsister species pair differentiated by ecology, mating system, and partialreproductive isolation. Despite extensive research on this system, the historyof divergence and differentiation in this sister pair is unclear. We presentand analyze a novel population genomic data set which shows that M. nasutus"budded" off of a central Californian M. guttatus population within the last200 to 500 thousand years. In this time, the M. nasutus genome has accruednumerous genomic signatures of the transition to predominant selfing. Despiteclear biological differentiation, we document ongoing, bidirectionalintrogression. We observe a negative relationship between the recombinationrate and divergence between M. nasutus and sympatric M. guttatus samples,suggesting that selection acts against M. nasutus ancestry in M. guttatus.

Speciation and introgression between Mimulus nasutus and Mimulus guttatus