Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/130564
Title: Population genomics reveals the underlying structure of the small pelagic European Sardine and suggests low connectivity within Macaronesia
Authors: da Fonseca, Rute R.
Campos, Paula F.
Rey-Iglesia, Alba
Barroso, Gustavo V.
Bergeron, Lucie A.
Nande, Manuel
Tuya, Fernando 
Abidli, Sami
Perez, Montse
Riveiro, Isabel
Carrera, Pablo
Jurado-Ruzafa, Alba
Santamaria, M. Teresa G.
Faria, Rui
Machado, Andre M.
Fonseca, Miguel M.
Froufe, Elsa
Castro, L. Filipe C.
UNESCO Clasification: 251005 Zoología marina
Keywords: Genetic-Structure
Pilchardus
Atlantic
Phylogeography
Expansion, et al
Issue Date: 2024
Journal: Genes 
Abstract: The European sardine (Sardina pilchardus, Walbaum 1792) is indisputably a commercially important species. Previous studies using uneven sampling or a limited number of makers have presented sometimes conflicting evidence of the genetic structure of S. pilchardus populations. Here, we show that whole genome data from 108 individuals from 16 sampling areas across 5000 km of the species' distribution range (from the Eastern Mediterranean to the archipelago of Azores) support at least three genetic clusters. One includes individuals from Azores and Madeira, with evidence of substructure separating these two archipelagos in the Atlantic. Another cluster broadly corresponds to the center of the distribution, including the sampling sites around Iberia, separated by the Almeria-Oran front from the third cluster that includes all of the Mediterranean samples, except those from the Alboran Sea. Individuals from the Canary Islands appear to belong to the Mediterranean cluster. This suggests at least two important geographical barriers to gene flow, even though these do not seem complete, with many individuals from around Iberia and the Mediterranean showing some patterns compatible with admixture with other genetic clusters. Genomic regions corresponding to the top outliers of genetic differentiation are located in areas of low recombination indicative that genetic architecture also has a role in shaping population structure. These regions include genes related to otolith formation, a calcium carbonate structure in the inner ear previously used to distinguish S. pilchardus populations. Our results provide a baseline for further characterization of physical and genetic barriers that divide European sardine populations, and information for transnational stock management of this highly exploited species towards sustainable fisheries.
URI: http://hdl.handle.net/10553/130564
ISSN: 2073-4425
DOI: 10.3390/genes15020170
Source: Genes [ISSN 2073-4425], v. 15 (2), (Febrero 2024)
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