Genome‐Wide Population Structure in a Marine Keystone Species, the European Flat Oyster ( Ostrea edulis ) - Archive ouverte HAL
Article Dans Une Revue Molecular Ecology Année : 2024

Genome‐Wide Population Structure in a Marine Keystone Species, the European Flat Oyster ( Ostrea edulis )

Homère Alves Monteiro
Dorte Bekkevold
George Pacheco
  • Fonction : Auteur
Stein Mortensen
  • Fonction : Auteur
Runyang Nicolas Lou
Nina Therkildsen
Chloé Robert
Pierre de Wit
Dorte Meldrup
  • Fonction : Auteur
Ane Laugen
Philine zu Ermgassen
Åsa Strand
Camille Saurel
Jakob Hemmer-Hansen

Résumé

ABSTRACT Ostrea edulis, the European flat oyster, was once a widespread economically and ecologically important marine species, but has suffered dramatic declines over the past two centuries. Consequently, there has been a surge in European restoration efforts, many of which focus on restocking as a conservation measure. In this study, we used whole‐genome sequencing (WGS) data to investigate the population structure, demographic history, and patterns of local adaptation of O. edulis across its natural distribution with increased sampling densities at Scandinavian localities. Results revealed seven distinct genetic clusters, including previously undescribed complex population structure in Norway, and evidence for introgression between genetic clusters in Scandinavia. We detected large structural variants (SVs) on three pseudo‐chromosomes. These megabase long regions were characterised by strong linkage disequilibrium and clear geographical differentiation, suggestive of chromosomal inversions potentially associated with local adaptation. The results indicated that genomic traces of past translocations of non‐native O. edulis were still present in some individuals, but overall, we found limited evidence of major impacts of translocations on the scale of contemporary population structure. Our findings highlight the importance of considering population structure and signatures of selection in the design of effective conservation strategies to preserve and restore wild native European flat oyster populations, and we provide direct knowledge safeguarding sustainable mitigation actions in this important species.
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Dates et versions

hal-04807699 , version 1 (27-11-2024)

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Citer

Homère Alves Monteiro, Dorte Bekkevold, George Pacheco, Stein Mortensen, Runyang Nicolas Lou, et al.. Genome‐Wide Population Structure in a Marine Keystone Species, the European Flat Oyster ( Ostrea edulis ). Molecular Ecology, 2024, ⟨10.1111/mec.17573⟩. ⟨hal-04807699⟩
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