Population structure of blackfin tuna (Thunnus atlanticus) in the western Atlantic Ocean inferred from microsatellite loci

Type Article
Date 2022-06
Language English
Author(s) Saillant Eric A.1, Luque Patricia L.1, Short Emily1, Antoni Luca1, Reynal LionelORCID2, Pau Cedric2, Arocha Freddy3, Roque Pollyana4, Hazin Fabio4
Affiliation(s) 1 : School of Ocean Science and Engineering, Gulf Coast Research Laboratory, University of Southern Mississippi, Ocean Springs, MS, 39564, USA
2 : IFREMER Délégation de Martinique, 97231, Le Robert, La Martinique, France
3 : Instituto Oceanográfico de Venezuela, Universidad de Oriente, Cumana, 6101, Venezuela
4 : UFRPE-Universidade Federal Rural de Pernambuco, Rua Dois Irmãos, s/n, Recife, PE, Brazil
Source Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2022-06 , Vol. 12 , N. 1 , P. 9830 (9p.)
DOI 10.1038/s41598-022-13857-z
Keyword(s) Marine biology, Molecular ecology

The blackfin tuna, Thunnus atlanticus, is a small tropical tuna exploited by recreational and commercial fisheries in various parts of its range. Information on stock structure is needed to develop management plans for this species but is currently lacking. In this work, 470 blackfin tuna from nine geographic populations were assayed at 13 homologous microsatellite markers to provide a first assessment of stock structure across the species range. The overall divergence among locality samples was very low (overall FST = 0.0004) indicating high connectivity of blackfin tuna across their range. No clear grouping of localities in differentiated units was inferred but structuring followed a weak isolation by distance pattern (r = 0.16, P = 0.032). Pairwise exact tests and spatial analysis of molecular variance suggested divergence of the sample collected offshore Baía Formosa (Brazil) possibly reflecting reproductive isolation of Brazilian populations from those in the Caribbean region and further north. Further study of the status of Brazilian populations and the transition between this region and the Caribbean is warranted. Cryptic subdivision within the Northern Hemisphere part of the range is possible and should be evaluated using increased marker density and a more comprehensive geographic coverage.

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Saillant Eric A., Luque Patricia L., Short Emily, Antoni Luca, Reynal Lionel, Pau Cedric, Arocha Freddy, Roque Pollyana, Hazin Fabio (2022). Population structure of blackfin tuna (Thunnus atlanticus) in the western Atlantic Ocean inferred from microsatellite loci. Scientific Reports, 12(1), 9830 (9p.). Publisher's official version : https://doi.org/10.1038/s41598-022-13857-z , Open Access version : https://archimer.ifremer.fr/doc/00777/88902/