Variabilidad genética local del bivalvo dulceacuícola Diplodon chilensis (Gray 1828) proveniente de tres lagos Nahuelbutanos

Abstract

Genetic variability of a freshwater bivalve Diplodon chilensis from three Nahuelbuta lakes was described. Each lake shows geographic barriers 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 deficit, Hardy-Weinberg equilibrium, lenthic systems. RESUMENSe describe la variabilidad genética del bivalvo dulceacuícola Diplodon chilensis proveniente de tres lagos Nahuelbutanos, cada uno de los cuales presenta barreras geográficas y diferencias ambientales reconocibles como consecuencia de diversos eventos geomorfológicos y antrópicos. Nuestros resultados revelaron que sólo Lago Lleu-Lleu se encuentra de equilibrio Hardy-Weinberg (P< 0.05). El desequilibrio gamético se manifestó en las tres poblaciones p< 0.001 lo que podría explicarse por la complejidad de su ciclo reproductivo. La Posada y Laguna Chica de San Pedro presentan déficit de heterocigotos (Fis). Los valores de Fst global (0.027) y AMOVA para la población total indican que estas poblaciones no están estructuradas lo que sugiere procesos de migración recientes a través de los cursos de agua.Palabras clave: Diplodon chilensis, desequilibrio gamético, déficit de heterocigotos, equilibrio Hardy-Weinberg, sistemas lénticos.

Genetic Structure and Gene Flow of Octopus maya (Mollusca: Cephalopoda) in the States of Yucatan and Campeche, Mexico / Estrutura genética e fluxo gênico do polvo maya (Mollusca: Cephalopoda) nos Estados de Yucatan e Campeche, México

“…Figure 1 an indication of the stability of the species, that is, that the population of Octopus maya is demographically stable, indicating that this population has not been subject to recent genetic events, as it may have been subject to a founding effect or recurrent bottlenecks; in fact, one of the aspects that makes this species desirable to be exploited is its high population size. Considering the care that must be taken when comparing allozimic data, the heterozygosis values detected in this study are relatively higher than those detected by the determination of isoenzymes in other cephalopod species, but still within the established range for invertebrate organisms, where a generalized occurrence of heterozygosis deficiency relative to Hardy-Weinberg law expectations has been fully reported in studies of isoenzymes in marine mollusks and other invertebrates (Maltagliati et al, 2002a, Maltagliati et al, 2002bDoubleday 2009;Quiang et al, 2009;Fuentealba et al, 2010;Hmida et al, 2012). The average heterozygosis values for the populations in O. maya are between 0.1142 and 0.1390 (Table 1) and the outputs of the Hardy-Weinberg equilibrium law are mainly supported by some loci such as EST1 and G6PDH1 (data not shown) in most populations.…”

Shape, Microstructure, and Chemical Composition of Pearls from the Freshwater Clam Diplodon chilensis Native to South America

“…It has been postulated that variations in certain life history traits between D. chilensis populations from lotic and lentic environments could be due to genetic differences [49], although a karyological study contradicted this hypothesis [50]. Consistent with the latter, it has been reported that the populations of this clam from different basins near the Pacific coast in southern Chile are not genetically structured [51], and that differences found in the growth rates can be associated with geographic and limnological parameters [32].…”

Evidence of Climate Change Based on Lake Surface Temperature Trends in South Central Chile

“…Lakes with a surface area ≥ 10 km 2 were selected based on [6]. The 14 selected lakes present a temperate monomictic circulation pattern, with thermal stratification during summer [34][35][36][37]. At present, 11 of the lakes chosen in this study are oligotrophic, while Villarrica has been classified as meso-oligotrophic, and Vichuquén and Lanalhue, as eutrophic [38].…”