Abstract

Genetic population structure of the pink snail, Strombus gigas, in the Yucatan Peninsula, Mexico, was determined by means of the isozymes expression in poliacrylamide gels.\Samples of muscle of fifty organisms, captured in four places of the Yucatan Peninsula, were used to detect the genotypic expression revealed by the expression of fifty five loci, as results of thirty enzymatic systems.\The TFPGA program was used (Tools for population genetics analyzes), to make the analysis of genics frequencies data of the populations in its version 1.3. The parameters used were: Descriptive statistical, statistic F, Genetic distances, Equilibrium of Hardy - Weinberg, UPGMA and the numberofmigrants as indicator of the gene flow.\The heterozygosity values, in a range of 0.3240 for the OCTDH 2 anda value of 0.0440 for FUM, with a value of heterozigosity average of O.0366, values of Fis with a range of 0.0835 for the OCTDH 2 up to 0.3600 for the FUM and a value average of -0.0492, those of Fst 0.1039 with a range of 0.0082 for LAP 2 up to 0.1967 for MDH 2 indica te us a heterozigosity deficiency, but they correspond to reported for moluscs marines species. The derived number of migrants of the equation of Slatkin is of 2.156 by generation indicate a certain grade of variability among the populations in global form and they corroborate the first values of genetics distance of Nei that with 0.0053 in the node that relates the population of Alacranes point out the separation of this population with the others populations.\The results of this study suggest that the populations of Strombus gigas in the Mexican Caribbean present a certain grade of variability.

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