Population genetics meets phylogenetics: new insights into the relationships among members of the genus Euthynnus

Euthynnus (family Scombridae) is a genus of marine pelagic fish species with a worldwide distribution that comprises three allopatric species: E. alletteratus, E. affinis and E. lineatus. All of them targeted by artisanal and commercial fisheries. We analyzed 263 individuals from Atlantic and Pacifi...

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Bibliographic Details
Published in:Hydrobiologia 2022-01, Vol.849 (1), p.47-62
Main Authors: Ollé, Judith, Vilà-Valls, Laura, Alvarado-Bremer, Jaime, Cerdenares, Genoveva, Duong, Thuy Yen, Hajjej, Ghailen, Lino, Pedro G
Format: Article
Language:English
Subjects:
Allopatry
Biology
Calcium-binding protein
Calmodulin
Commercial fishing
Cryptic species
Datasets
Differentiation
Divergence
Euthynnus
Euthynnus alletteratus
Fish
Fish industry
Fisheries
Genetic markers
Genetics
Geographical distribution
Heterogeneity
Marine fish
Marine fishes
Mitochondrial DNA
Oceans
Pelagic fish
Pelagic fisheries
Phylogenetics
Phylogeny
Population genetics
Scombridae
Species
Tropical climate
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Summary:Euthynnus (family Scombridae) is a genus of marine pelagic fish species with a worldwide distribution that comprises three allopatric species: E. alletteratus, E. affinis and E. lineatus. All of them targeted by artisanal and commercial fisheries. We analyzed 263 individuals from Atlantic and Pacific Oceans using two genetic markers, the mtDNA Control Region (350 bp) and nuclear calmodulin (341 bp). The results obtained challenge the phylogeny of this group. We found a deep genetic divergence, probably at species level, within E. alletteratus, between the North Atlantic-Mediterranean and the Tropical East Atlantic. This deep genetic divergence was tested with several species delimitation methods. This complete phylogeographic association between the North Atlantic and the Tropical East Atlantic support the hypothesis of two cryptic species. In addition, population genetic heterogeneity was detected between the North East Atlantic-Mediterranean and North West Atlantic regions. Our results indicate two scales of differentiation in what is currently considered a single population. Accordingly, for management purposes, the populations of E. alletteratus, should be divided into a minimum of three management units. On the other hand, the high level of differentiation found in E. alletteratus contrasts with the shallow genetic divergence of E. affinis and E. lineatus.
ISSN:0018-8158
1573-5117
DOI:10.1007/s10750-021-04707-6