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Article Dans Une Revue Molecular Ecology Année : 2023

Unidirectional trans‐Atlantic gene flow and a mixed spawning area shape the genetic connectivity of Atlantic bluefin tuna

Natalia Díaz-Arce
  • Fonction : Auteur
Pierre‐alexandre Gagnaire
  • Fonction : Auteur
David Richardson
  • Fonction : Auteur
John Walter
  • Fonction : Auteur
Deirdre Brophy
  • Fonction : Auteur
Molly Lutcavage
  • Fonction : Auteur
Piero Addis
  • Fonction : Auteur
Francisco Alemany
  • Fonction : Auteur
Robert Allman
  • Fonction : Auteur
Igaratza Fraile
  • Fonction : Auteur
Nicolas Goñi
  • Fonction : Auteur
Alex Hanke
  • Fonction : Auteur
Ashley Pacicco
  • Fonction : Auteur
Joseph Quattro
  • Fonction : Auteur
Jay Rooker
  • Fonction : Auteur
Haritz Arrizabalaga
  • Fonction : Auteur
Naiara Rodríguez-Ezpeleta

Résumé

Abstract The commercially important Atlantic bluefin tuna ( Thunnus thynnus ), a large migratory fish, has experienced notable recovery aided by accurate resource assessment and effective fisheries management efforts. Traditionally, this species has been perceived as consisting of eastern and western populations, spawning respectively in the Mediterranean Sea and the Gulf of Mexico, with mixing occurring throughout the Atlantic. However, recent studies have challenged this assumption by revealing weak genetic differentiation and identifying a previously unknown spawning ground in the Slope Sea used by Atlantic bluefin tuna of uncertain origin. To further understand the current and past population structure and connectivity of Atlantic bluefin tuna, we have assembled a unique dataset including thousands of genome‐wide single‐nucleotide polymorphisms (SNPs) from 500 larvae, young of the year and spawning adult samples covering the three spawning grounds and including individuals of other Thunnus species. Our analyses support two weakly differentiated but demographically connected ancestral populations that interbreed in the Slope Sea. Moreover, we also identified signatures of introgression from albacore ( Thunnus alalunga ) into the Atlantic bluefin tuna genome, exhibiting varied frequencies across spawning areas, indicating strong gene flow from the Mediterranean Sea towards the Slope Sea. We hypothesize that the observed genetic differentiation may be attributed to increased gene flow caused by a recent intensification of westward migration by the eastern population, which could have implications for the genetic diversity and conservation of western populations. Future conservation efforts should consider these findings to address potential genetic homogenization in the species.
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Dates et versions

hal-04403897 , version 1 (18-01-2024)

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Natalia Díaz-Arce, Pierre‐alexandre Gagnaire, David Richardson, John Walter, Sophie Arnaud-Haond, et al.. Unidirectional trans‐Atlantic gene flow and a mixed spawning area shape the genetic connectivity of Atlantic bluefin tuna. Molecular Ecology, 2023, 33 (1), ⟨10.1111/mec.17188⟩. ⟨hal-04403897⟩
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