Demographic Processes Linked to Genetic Diversity and Positive Selection across a Species' Range.

ABSTRACT: Demography determines the strength of genetic drift, which generally reduces genetic variation and the efficacy of selection. Here, we disentangled the importance of demographic processes at a local scale (census size and mating system) and at a species-range scale (old split between population clusters, recolonization after the last glaciation cycle, and admixture) in determining within-population genomic diversity and genomic signatures of positive selection. Analyses were based on re-sequence data from 52 populations of North American Arabidopsis lyrata collected across its entire distribution. The mating system and range dynamics since the last glaciation cycle explained around 60% of the variation in genomic diversity among populations and 52% of the variation in the signature

SUBMITTER: Willi Y 

PROVIDER: S-EPMC7747977 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature