Volume 58

Genetic Structure of Octopus maya in the Campeche and Yucatan States in the Yucatan Peninsula

Tello-Cetina, J., J. Escamilla Sanchez, L. Rodríguez Gil, A. Góngora Gomez, J. Carrillo Galaz
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Date: November, 2005

Pages: 387-392

Event: Proceedings of the Fifty Eighth Annual Gulf and Caribbean Fisheries Institute

City: San Andres

Country: Colombia


Genetic population structure of the red squid Mayan Octopus in the Campeche and Yucatan States of the Yucatan, Peninsula, Mexico was determined, by means of the expression of isoenzimas in poliacrylamide gels. Samples of mantle of twenty five organisms, captured in five sites of the Yucatan Peninsula, were used to characterize the genotipic expression revealed by the expression of 23 loci in thirty enzymatic systems. The TFPGA Program, version 1,3 (for Tools population genetic analyses), was used to process the data of genic frequencies of isozymes of the populations in study. The parameters used were: Descriptive statistics, Statistical F, genetic Distances, equilibrium of Hardy - Weinberg, UPGMA and the number of migrantes like indicator of the flow of genes. The heterozygosity values, in a range of 0,2335 for ME and 0,4293 for PGM 1, with a value of heterozygosis average of 0,1238, those of Fis with a range of 0,4100 and those of Fst of 0,0110 indicate us a heterozigosity deficiency, but they are within the ranks reported for species of marine invertebrates. The derived number of migrantes of the equation of Slatkin was from 2,1 by generation, which in global form indicates a certain degree of variability between the populations and is consistent with the low values of genetic distance of Nei found, particularly the node that suggests the separation of the population of Rio Lagartos and Dzilam Bravo with the others studied populations, with an obtained value of 0.0004. From the results of this study, we can conclude that the populations of Mayan octopus present a certain degree of interpopulation genetic variability that does not reflect fragility in the subsistence of these populations.

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