--- res: bibo_abstract: - 'This paper analyses 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 loci is sufficient for population sizes to decline. This further reduces the efficacy of selection at individual loci due to increased drift and because smaller populations are more prone to swamping due to migration, causing a positive feedback between increasing maladaptation and declining population sizes. Our analysis also highlights the importance of demographic stochasticity, which exacerbates the decline in numbers of maladapted populations, leading to population collapse in the rare habitat at significantly lower migration than predicted by deterministic arguments.@eng' bibo_authorlist: - foaf_Person: foaf_givenName: Eniko foaf_name: Szep, Eniko foaf_surname: Szep foaf_workInfoHomepage: http://www.librecat.org/personId=485BB5A4-F248-11E8-B48F-1D18A9856A87 - foaf_Person: foaf_givenName: Himani foaf_name: Sachdeva, Himani foaf_surname: Sachdeva foaf_workInfoHomepage: http://www.librecat.org/personId=42377A0A-F248-11E8-B48F-1D18A9856A87 - foaf_Person: foaf_givenName: Nicholas H foaf_name: Barton, Nicholas H foaf_surname: Barton foaf_workInfoHomepage: http://www.librecat.org/personId=4880FE40-F248-11E8-B48F-1D18A9856A87 orcid: 0000-0002-8548-5240 bibo_doi: 10.1111/evo.14210 bibo_issue: '5' bibo_volume: 75 dct_date: 2021^xs_gYear dct_identifier: - UT:000636966300001 dct_isPartOf: - http://id.crossref.org/issn/0014-3820 - http://id.crossref.org/issn/1558-5646 dct_language: eng dct_publisher: Wiley@ dct_subject: - Genetics - Ecology - Evolution - Behavior and Systematics - General Agricultural and Biological Sciences dct_title: 'Polygenic local adaptation in metapopulations: A stochastic eco‐evolutionary model@' ...