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Genome divergence between European anchovy ecotypes fuelled by structural variants originating from trans-equatorial admixture

2025-11Journal article Open access
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dc.contributor.authorMeyer, Laura
dc.contributor.authorBarry, Pierre
dc.contributor.authorMoan, Alan Le
dc.contributor.authorArbiol, Christine
dc.contributor.authorCastilho, Rita
dc.contributor.authorLingen, Carl Van der
dc.contributor.authorChlaïda, Malika
dc.contributor.authorMcKeown, Niall
dc.contributor.authorErnande, Bruno
dc.contributor.authorBonhomme, François
dc.contributor.authorGagnaire, Pierre-Alexandre
dc.contributor.authorGuinand, Bruno
dc.date.accessioned2025-12-18T11:20:55Z
dc.date.available2025-12-18T11:20:55Z
dc.date.issued2025-11
dc.description.abstractThe formation of ecotypes is driven by evolutionary mechanisms that reduce gene flow through complex interactions among ecological, historical and genomic factors. In the European anchovy (Engraulis encrasicolus), marine and coastal ecotypes have been identified in the northeast Atlantic and the Mediterranean Sea, yet the genomic basis of their divergence remains unclear. Here, we present the first genome-scale analysis of this species complex, integrating whole-genome sequencing (WGS) and RAD-seq data from populations spanning its distribution range. In addition to the known marine and coastal ecotypes, we identify a previously undetected lineage extending from southern Morocco, through the Canary Islands, to South Africa. This southern Atlantic lineage exhibits a gradient of admixture with northern populations near the Atlantic–Mediterranean transition zone. Genomic differentiation landscapes reveal large regions of high linkage disequilibrium, probably corresponding to 13 structural variants (SVs) segregating within or between lineages. Notably, three of the six SVs contributing to the gene flow barrier between northern ecotypes originated in the southern lineage, supporting a partially shared evolutionary history between the coastal ecotype and the southern lineage. This study highlights how SVs that arose in geographically isolated lineages can act as key genetic elements in ecotype formation, reinforcing reproductive isolation through distinct evolutionary pathways.eng
dc.description.sponsorshipANR grant CoGeDiv ANR-17-CE02-0 006-01 to P.-A.G
dc.identifier.doi10.1098/rspb.2025.1416
dc.identifier.issn1471-2954
dc.identifier.urihttp://hdl.handle.net/10400.1/27982
dc.language.isoeng
dc.peerreviewedyes
dc.publisherThe Royal Society
dc.relation.ispartofProceedings of the Royal Society B: Biological Sciences
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectEcotypes
dc.subjectStructural variants
dc.subjectAdmixture
dc.subjectPopulation genomics
dc.subjectEvolutionary history
dc.titleGenome divergence between European anchovy ecotypes fuelled by structural variants originating from trans-equatorial admixtureeng
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issue2058
oaire.citation.titleProceedings of the Royal Society B: Biological Sciences
oaire.citation.volume292
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameCastilho
person.givenNameRita
person.identifier452212
person.identifier.ciencia-id0513-0407-A6C1
person.identifier.orcid0000-0003-0727-3688
person.identifier.ridB-6185-2008
person.identifier.scopus-author-id56271196600
relation.isAuthorOfPublication051f68ec-18e0-4008-b06d-bf4b996fa098
relation.isAuthorOfPublication.latestForDiscovery051f68ec-18e0-4008-b06d-bf4b996fa098

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