---
_id: '9252'
abstract:
- lang: eng
  text: '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.'
acknowledgement: We thank the reviewers for their helpful comments, and also our colleagues,
  for illuminating discussions over the long gestation of this paper.
article_processing_charge: Yes (via OA deal)
article_type: original
author:
- first_name: Eniko
  full_name: Szep, Eniko
  id: 485BB5A4-F248-11E8-B48F-1D18A9856A87
  last_name: Szep
- first_name: Himani
  full_name: Sachdeva, Himani
  id: 42377A0A-F248-11E8-B48F-1D18A9856A87
  last_name: Sachdeva
- first_name: Nicholas H
  full_name: Barton, Nicholas H
  id: 4880FE40-F248-11E8-B48F-1D18A9856A87
  last_name: Barton
  orcid: 0000-0002-8548-5240
citation:
  ama: 'Szep E, Sachdeva H, Barton NH. Polygenic local adaptation in metapopulations:
    A stochastic eco‐evolutionary model. <i>Evolution</i>. 2021;75(5):1030-1045. doi:<a
    href="https://doi.org/10.1111/evo.14210">10.1111/evo.14210</a>'
  apa: 'Szep, E., Sachdeva, H., &#38; Barton, N. H. (2021). Polygenic local adaptation
    in metapopulations: A stochastic eco‐evolutionary model. <i>Evolution</i>. Wiley.
    <a href="https://doi.org/10.1111/evo.14210">https://doi.org/10.1111/evo.14210</a>'
  chicago: 'Szep, Eniko, Himani Sachdeva, and Nicholas H Barton. “Polygenic Local
    Adaptation in Metapopulations: A Stochastic Eco‐evolutionary Model.” <i>Evolution</i>.
    Wiley, 2021. <a href="https://doi.org/10.1111/evo.14210">https://doi.org/10.1111/evo.14210</a>.'
  ieee: 'E. Szep, H. Sachdeva, and N. H. Barton, “Polygenic local adaptation in metapopulations:
    A stochastic eco‐evolutionary model,” <i>Evolution</i>, vol. 75, no. 5. Wiley,
    pp. 1030–1045, 2021.'
  ista: 'Szep E, Sachdeva H, Barton NH. 2021. Polygenic local adaptation in metapopulations:
    A stochastic eco‐evolutionary model. Evolution. 75(5), 1030–1045.'
  mla: 'Szep, Eniko, et al. “Polygenic Local Adaptation in Metapopulations: A Stochastic
    Eco‐evolutionary Model.” <i>Evolution</i>, vol. 75, no. 5, Wiley, 2021, pp. 1030–45,
    doi:<a href="https://doi.org/10.1111/evo.14210">10.1111/evo.14210</a>.'
  short: E. Szep, H. Sachdeva, N.H. Barton, Evolution 75 (2021) 1030–1045.
corr_author: '1'
date_created: 2021-03-20T08:22:10Z
date_published: 2021-05-01T00:00:00Z
date_updated: 2025-06-12T06:35:39Z
day: '01'
ddc:
- '570'
department:
- _id: NiBa
doi: 10.1111/evo.14210
external_id:
  isi:
  - '000636966300001'
  pmid:
  - '33742441'
file:
- access_level: open_access
  checksum: b90fb5767d623602046fed03725e16ca
  content_type: application/pdf
  creator: kschuh
  date_created: 2021-08-11T13:39:19Z
  date_updated: 2021-08-11T13:39:19Z
  file_id: '9886'
  file_name: 2021_Evolution_Szep.pdf
  file_size: 734102
  relation: main_file
  success: 1
file_date_updated: 2021-08-11T13:39:19Z
has_accepted_license: '1'
intvolume: '        75'
isi: 1
issue: '5'
keyword:
- Genetics
- Ecology
- Evolution
- Behavior and Systematics
- General Agricultural and Biological Sciences
language:
- iso: eng
license: https://creativecommons.org/licenses/by-nc-nd/4.0/
month: '05'
oa: 1
oa_version: Published Version
page: 1030-1045
pmid: 1
publication: Evolution
publication_identifier:
  eissn:
  - 1558-5646
  issn:
  - 0014-3820
publication_status: published
publisher: Wiley
quality_controlled: '1'
related_material:
  record:
  - id: '13062'
    relation: research_data
    status: public
scopus_import: '1'
status: public
title: 'Polygenic local adaptation in metapopulations: A stochastic eco‐evolutionary
  model'
tmp:
  image: /images/cc_by_nc_nd.png
  legal_code_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
  name: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
    (CC BY-NC-ND 4.0)
  short: CC BY-NC-ND (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 75
year: '2021'
...