Weak coupling among barrier loci and waves of neutral and adaptive introgression across an expanding hybrid zone.

ABSTRACT: Hybridization can serve as an evolutionary stimulus, but we have little understanding of introgression at early stages of hybrid zone formation. We analyze reproductive isolation and introgression between a range-limited and a widespread species. Reproductive barriers are estimated based on differences in flowering time, ecogeographic distributions, and seed set from crosses. We find an asymmetrical mating barrier due to cytonuclear incompatibility that is consistent with observed clusters of coincident and concordant tension zone clines (barrier loci) for mtDNA haplotypes and nuclear SNPs. These groups of concordant clines are spread across the hybrid zone, resulting in weak coupling among barrier loci and extensive introgression. Neutral clines had nearly equal introgression into both sp

SUBMITTER: Cruzan MB 

PROVIDER: S-EPMC9298192 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature