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Gayana (Concepción)

Print version ISSN 0717-652XOn-line version ISSN 0717-6538


FUENTEALBA, Carmen; FIGUEROA, Ricardo; GONZALEZ, Fidelina  and  PALMA, Mario. Local genetic variability of the freshwater bivalve Diplodon chilensis (Gray 1828) from three Nahuelbuta lakes. Gayana (Concepc.) [online]. 2010, vol.74, n.2, pp.113-124. ISSN 0717-652X.

Genetic variability of a freshwater bivalve Diplodon chilensis from three Nahuelbuta lakes was described. Each lake shows geographic barriere and environmental characteristics as a consequence of geomorphologic and antropic events. Our results shows that only Lleu-Lleu lake was in Hardy-Weinberg equilibrium (P<0.05). All populations show gametic desequilibrium (P < 0.001), as an evidence of the species' life cycle. There are heterozygote deficiencies (Fis) in Laguna La Posada and Laguna Chica de San Pedro. Global Fst (0.027) and AMOVA test values for pooling subpopulation show non structured population, as an evidence of recent migration process.

Keywords : Diplodon chilensis; linkage disequilibrium; heterozygote déficit; Hardy-Weinberg equilibrium; lenthic systems.

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