Polygenic local adaptation in metapopulations: A stochastic eco-evolutionary model.

ABSTRACT: This article analyzes the conditions for local adaptation in a metapopulation with infinitely many islands under a model of hard selection, where population size depends on local fitness. Each island belongs to one of two distinct ecological niches or habitats. Fitness is influenced by an additive trait which is under habitat-dependent directional selection. Our analysis is based on the diffusion approximation and accounts for both genetic drift and demographic stochasticity. By neglecting linkage disequilibria, it yields the joint distribution of allele frequencies and population size on each island. We find that under hard selection, the conditions for local adaptation in a rare habitat are more restrictive for more polygenic traits: even moderate migration load per locus at very many lo

SUBMITTER: Szep E 

PROVIDER: S-EPMC8251656 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature