Resumen del producto

Low levels of population genetic structure detected in widely distributed marine pelagic fishes have been attributed to processes such as, large effective population sizes, high capacity to disperse through migration and/or larvae drift which promotes gene flow between distant populations, and/or very recent population divergence events that can’t be detected with a limited number of variable molecular markers.Coryphaena hippurus is a cosmopolitan fish found in tropical and subtropical waters, for which population genetic homogeneity has been previously reported. However, with advances in protocols based on Next Generation Sequencing (NGS) it has become possible to break the paradigm of population genetic homogeneity in other cosmopolitan pelagic species such as the yellowfin tuna. Here, we used RAD-Seq to develop new genomic resources for the species as a set of baits to screen more than a thousand polymorphic nuclear loci. We implemented this bait set in hundreds of individuals from around the globe using the method RADcap. And, we also sequenced whole mitochondrial genomes in a limited set of samples. We were able to study the global population genetics of this ecologically and economically important species. Our results reveal the presence of at least three distinct populations for dolphinfish, which corresponds to ocean basins Indo-Pacific, Atlantic and Mediterranean. The results highlight the importance of sea surface temperature breaks in South Africa and the Gibraltar Straight as biogeographic barriers and determine how these modulate the distribution of the genetic diversity and population demography of this pelagic species.

Palabras clave: population genetic structure; Dolphinfish; RAD-Seq

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