Abstract
Five eastern Pacific yellowfin tuna samples (four northern: 10–25°N, 95–130°W, and one southern: 16–18°S, 95–97°W), collected from fishing vessels between 1994 and 2002 were analyzed for variation at seven microsatellite loci to evaluate their spatial genetic homogeneity. Single-locus homogeneity exact tests revealed significant genetic differentiation caused by three of seven loci. Pairwise sample comparisons of multilocus allele-frequency homogeneity tests and subpopulation division (F ST), revealed significant differentiation in comparisons between north equatorial samples and the south equatorial sample. AMOVA analysis among collections grouped as northern and southern populations separated by the equator in the eastern Pacific confirmed the differentiation observed. These results may be considered as preliminary evidence of the presence of discrete populations in the eastern Pacific yellowfin tuna. The possibility that the spatial differentiation observed corresponds to temporal variation or non-random sampling cannot be discarded. The genetic differences encountered need to be corroborated by increasing sample sizes, including temporal replicates, and by the use of an alternative marker.
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Díaz-Jaimes, P., Uribe-Alcocer, M. Spatial differentiation in the eastern Pacific yellowfin tuna revealed by microsatellite variation. Fish Sci 72, 590–596 (2006). https://doi.org/10.1111/j.1444-2906.2006.01188.x
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DOI: https://doi.org/10.1111/j.1444-2906.2006.01188.x