info:eu-repo/semantics/article
Population genetic structure of long-tailed pygmy rice rats (Oligoryzomys longicaudatus) from Argentina and Chile based on the mitochondrial control region
Registro en:
González Ittig, Raúl Enrique; Rossi Fraire, Hernán J.; Cantoni, Gustavo E.; Herrero, Eduardo Rafael; Benedetti, Rosendo; et al.; Population genetic structure of long-tailed pygmy rice rats (Oligoryzomys longicaudatus) from Argentina and Chile based on the mitochondrial control region; National Research Council Canada-NRC Research Press; Canadian Journal of Zoology; 88; 1; 1-2010; 23-35
0008-4301
1480-3283
CONICET Digital
CONICET
Autor
González Ittig, Raúl Enrique
Rossi Fraire, Hernán J.
Cantoni, Gustavo E.
Herrero, Eduardo Rafael
Benedetti, Rosendo
Gallardo Narcisi, Milton Hermes
Gardenal, Cristina Noemi
Resumen
The rodent Oligoryzomys longicaudatus (Bennett, 1832) (Rodentia, Cricetidae) inhabits southern forests of Argentina and Chile, a region severely affected by glaciations during the Pleistocene-Holocene periods. We evaluate here the diversity of the mitochondrial control region to characterize the genetic structure of this species from forests and bushy areas of seven populations from Argentina and four populations from Chile. Statistical analyses showed shallow haplotype trees and mismatch distributions compatible with recent range expansions. The presence of "private" haplotypes indicates that current levels of gene flow among populations of each country would be low to moderate. Significant differences in haplotype frequencies were detected between eastern and western populations, indicating that the Andes mountains would be an effective geographic barrier for gene flow despite the existing valleys that could act as corridors for dispersion. A single clade containing all the haplotypes was recovered in the phylogenetic trees, suggesting postglacial dispersion from a single refugium during the Last Glacial Maximum. The higher effective size and levels of polymorphism in populations from Chile suggest that the refugium was located in this country. The asymmetric gene flow from Chile to Argentina may reflect a recent colonization of the eastern populations. Fil: González Ittig, Raúl Enrique. Universidad Nacional de Córdoba. Facultad de Cs.exactas Físicas y Naturales. Cátedra de Genética de Poblaciones y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina Fil: Rossi Fraire, Hernán J.. Universidad Nacional de Córdoba. Facultad de Cs.exactas Físicas y Naturales. Cátedra de Genética de Poblaciones y Evolución; Argentina Fil: Cantoni, Gustavo E.. Gobierno de la Provincia de Rio Negro. Ministerio de Salud. Unidad Regional de Epidemiologia y Salud Ambiental Zona Andina (uresa Zona Andina); Argentina Fil: Herrero, Eduardo Rafael. Gobierno de la Provincia de Rio Negro. Ministerio de Salud. Unidad Regional de Epidemiologia y Salud Ambiental Zona Andina (uresa Zona Andina); Argentina Fil: Benedetti, Rosendo. Provincia del Chubut. Secretaria de Salud; Argentina Fil: Gallardo Narcisi, Milton Hermes. Universidad Austral de Chile; Chile Fil: Gardenal, Cristina Noemi. Universidad Nacional de Córdoba. Facultad de Cs.exactas Físicas y Naturales. Cátedra de Genética de Poblaciones y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina