Multilocus Bayesian Estimates Oceanic Genetic Differentiation, Connectivity, and Admixture in Swordfish (Xiphias gladius L.)
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AuthorsSmith, B.L. (Brad L.); Lu, Ch.P. (Ching-Ping); García-Cortés, B. (Blanca); Viñas, J. (Jordi); Yeh, S. (Shean-Ya); Alvarado Bremer, J. R. (Jaime R.)
Previous genetic studies of Atlantic swordfish (Xiphias gladius L.) revealed significant differentiation among Mediterranean, North Atlantic and South Atlantic populations using both mitochondrial and nuclear DNA data. However, limitations in geographic sampling coverage, and the use of single loci, precluded an accurate placement of boundaries and of estimates of admixture. In this study, we present multilocus analyses of 26 single nucleotide polymorphisms (SNPs) within 10 nuclear genes to estimate population differentiation and admixture based on the characterization of 774 individuals representing North Atlantic, South Atlantic, and Mediterranean swordfish populations. Pairwise FST values, AMOVA, PCoA, and Bayesian individual assignments support the differentiation of swordfish inhabiting these three basins, but not the current placement of the boundaries that separate them. Specifically, the range of the South Atlantic population extends beyond 5°N management boundary to ...
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