Fluctuating reproductive isolation and stable ancestry structure in a fine-scaled mosaic of hybridizing Mimulus monkeyflowers.

ABSTRACT: Hybridization among taxa impacts a variety of evolutionary processes from adaptation to extinction. We seek to understand both patterns of hybridization across taxa and the evolutionary and ecological forces driving those patterns. To this end, we use whole-genome low-coverage sequencing of 458 wild-grown and 1565 offspring individuals to characterize the structure, stability, and mating dynamics of admixed populations of Mimulus guttatus and Mimulus nasutus across a decade of sampling. In three streams, admixed genomes are common and a M. nasutus organellar haplotype is fixed in M. guttatus, but new hybridization events are rare. Admixture is strongly unidirectional, but each stream has a unique distribution of ancestry proportions. In one stream, three distinct cohorts of admixed ancestr

SUBMITTER: Farnitano MC 

PROVIDER: S-EPMC11978108 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature