Pollinator loss causes rapid adaptive evolution of selfing and dramatically reduces genome-wide genetic variability.

ABSTRACT: Although selfing populations harbor little genetic variation limiting evolutionary potential, the causes are unclear. We experimentally evolved large, replicate populations of Mimulus guttatus for nine generations in greenhouses with or without pollinating bees and studied DNA polymorphism in descendants. Populations without bees adapted to produce more selfed seed yet exhibited striking reductions in DNA polymorphism despite large population sizes. Importantly, the genome-wide pattern of variation cannot be explained by a simple reduction in effective population size, but instead reflects the complicated interaction between selection, linkage, and inbreeding. Simulations demonstrate that the spread of favored alleles at few loci depresses neutral variation genome wide in large populations

SUBMITTER: Busch JW 

PROVIDER: S-EPMC9543508 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature