---
_id: '8708'
abstract:
- lang: eng
  text: The Mytilus complex of marine mussel species forms a mosaic of hybrid zones,
    found across temperate regions of the globe. This allows us to study ‘replicated’
    instances of secondary contact between closely related species. Previous work
    on this complex has shown that local introgression is both widespread and highly
    heterogeneous, and has identified SNPs that are outliers of differentiation between
    lineages. Here, we developed an ancestry‐informative panel of such SNPs. We then
    compared their frequencies in newly sampled populations, including samples from
    within the hybrid zones, and parental populations at different distances from
    the contact. Results show that close to the hybrid zones, some outlier loci are
    near to fixation for the heterospecific allele, suggesting enhanced local introgression,
    or the local sweep of a shared ancestral allele. Conversely, genomic cline analyses,
    treating local parental populations as the reference, reveal a globally high concordance
    among loci, albeit with a few signals of asymmetric introgression. Enhanced local
    introgression at specific loci is consistent with the early transfer of adaptive
    variants after contact, possibly including asymmetric bi‐stable variants (Dobzhansky‐Muller
    incompatibilities), or haplotypes loaded with fewer deleterious mutations. Having
    escaped one barrier, however, these variants can be trapped or delayed at the
    next barrier, confining the introgression locally. These results shed light on
    the decay of species barriers during phases of contact.
acknowledgement: Data used in this work were partly produced through the genotyping
  and sequencing facilities of ISEM and LabEx CeMEB, an ANR ‘Investissements d'avenir’
  program (ANR‐10‐LABX‐04‐01) This project benefited from the Montpellier Bioinformatics
  Biodiversity platform supported by the LabEx CeMEB. We thank Norah Saarman, Grant
  Pogson, Célia Gosset and Pierre‐Alexandre Gagnaire for providing samples. This work
  was funded by a Languedoc‐Roussillon ‘Chercheur(se)s d'Avenir’ grant (Connect7 project).
  P. Strelkov was supported by the Russian Science Foundation project 19‐74‐20024.
  This is article 2020‐240 of Institut des Sciences de l'Evolution de Montpellier.
article_processing_charge: No
article_type: original
author:
- first_name: Alexis
  full_name: Simon, Alexis
  last_name: Simon
- first_name: Christelle
  full_name: Fraisse, Christelle
  id: 32DF5794-F248-11E8-B48F-1D18A9856A87
  last_name: Fraisse
  orcid: 0000-0001-8441-5075
- first_name: Tahani
  full_name: El Ayari, Tahani
  last_name: El Ayari
- first_name: Cathy
  full_name: Liautard‐Haag, Cathy
  last_name: Liautard‐Haag
- first_name: Petr
  full_name: Strelkov, Petr
  last_name: Strelkov
- first_name: John J
  full_name: Welch, John J
  last_name: Welch
- first_name: Nicolas
  full_name: Bierne, Nicolas
  last_name: Bierne
citation:
  ama: Simon A, Fraisse C, El Ayari T, et al. How do species barriers decay? Concordance
    and local introgression in mosaic hybrid zones of mussels. <i>Journal of Evolutionary
    Biology</i>. 2021;34(1):208-223. doi:<a href="https://doi.org/10.1111/jeb.13709">10.1111/jeb.13709</a>
  apa: Simon, A., Fraisse, C., El Ayari, T., Liautard‐Haag, C., Strelkov, P., Welch,
    J. J., &#38; Bierne, N. (2021). How do species barriers decay? Concordance and
    local introgression in mosaic hybrid zones of mussels. <i>Journal of Evolutionary
    Biology</i>. Wiley. <a href="https://doi.org/10.1111/jeb.13709">https://doi.org/10.1111/jeb.13709</a>
  chicago: Simon, Alexis, Christelle Fraisse, Tahani El Ayari, Cathy Liautard‐Haag,
    Petr Strelkov, John J Welch, and Nicolas Bierne. “How Do Species Barriers Decay?
    Concordance and Local Introgression in Mosaic Hybrid Zones of Mussels.” <i>Journal
    of Evolutionary Biology</i>. Wiley, 2021. <a href="https://doi.org/10.1111/jeb.13709">https://doi.org/10.1111/jeb.13709</a>.
  ieee: A. Simon <i>et al.</i>, “How do species barriers decay? Concordance and local
    introgression in mosaic hybrid zones of mussels,” <i>Journal of Evolutionary Biology</i>,
    vol. 34, no. 1. Wiley, pp. 208–223, 2021.
  ista: Simon A, Fraisse C, El Ayari T, Liautard‐Haag C, Strelkov P, Welch JJ, Bierne
    N. 2021. How do species barriers decay? Concordance and local introgression in
    mosaic hybrid zones of mussels. Journal of Evolutionary Biology. 34(1), 208–223.
  mla: Simon, Alexis, et al. “How Do Species Barriers Decay? Concordance and Local
    Introgression in Mosaic Hybrid Zones of Mussels.” <i>Journal of Evolutionary Biology</i>,
    vol. 34, no. 1, Wiley, 2021, pp. 208–23, doi:<a href="https://doi.org/10.1111/jeb.13709">10.1111/jeb.13709</a>.
  short: A. Simon, C. Fraisse, T. El Ayari, C. Liautard‐Haag, P. Strelkov, J.J. Welch,
    N. Bierne, Journal of Evolutionary Biology 34 (2021) 208–223.
date_created: 2020-10-25T23:01:20Z
date_published: 2021-01-01T00:00:00Z
date_updated: 2025-07-10T12:01:23Z
day: '01'
department:
- _id: BeVi
- _id: NiBa
doi: 10.1111/jeb.13709
external_id:
  isi:
  - '000579599700001'
  pmid:
  - '33045123'
fulldoi: https://doi.org/10.1111/jeb.13709
intvolume: '        34'
isi: 1
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1101/818559
month: '01'
oa: 1
oa_version: Preprint
page: 208-223
pmid: 1
publication: Journal of Evolutionary Biology
publication_identifier:
  eissn:
  - 1420-9101
  issn:
  - 1010-061X
publication_status: published
publisher: Wiley
quality_controlled: '1'
related_material:
  record:
  - id: '13073'
    relation: research_data
    status: public
scopus_import: '1'
status: public
title: How do species barriers decay? Concordance and local introgression in mosaic
  hybrid zones of mussels
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 34
year: '2021'
...