Speciation and introgression between Mimulus nasutus and Mimulus guttatus
Abstract
Mimulus guttatus and M. nasutus are an evolutionary and ecological model sister species pair differentiated by ecology, mating system, and partial reproductive isolation. Despite extensive research on this system, the history of divergence and differentiation in this sister pair is unclear. We present and analyze a novel population genomic data set which shows that M. nasutus "budded" off of a central Californian M. guttatus population within the last 200 to 500 thousand years. In this time, the M. nasutus genome has accrued numerous genomic signatures of the transition to predominant selfing. Despite clear biological differentiation, we document ongoing, bidirectional introgression. We observe a negative relationship between the recombination rate and divergence between M. nasutus and sympatric M. guttatus samples, suggesting that selection acts against M. nasutus ancestry in M. guttatus.
Cite
@article{arxiv.1310.7131,
title = {Speciation and introgression between Mimulus nasutus and Mimulus guttatus},
author = {Yaniv Brandvain and Amanda M. Kenney and Lex Flagel and Graham Coop and Andrea L Sweigart},
journal= {arXiv preprint arXiv:1310.7131},
year = {2013}
}
Comments
Brandvain and Kenney contributed equally to this work. Coop and Sweigart jointly supervised this work. 65 pages, 3 main text figures