INVESTIGADORES
RIVERA luis osvaldo
artículos
Título:
Biogeography of Speciation of Two Sister Species of NeotropicalAmazona(Aves, Psittaciformes) Based on Mitochondrial Sequence Data
Autor/es:
AMANDA V. ROCHA; LUIS O. RIVERA; JAIME MARTINEZ; NEMORA P. PRESTES; RENATO CAPARROZ
Revista:
PLOS ONE
Editorial:
PUBLIC LIBRARY SCIENCE
Referencias:
Lugar: San Francisco; Año: 2014 vol. 9 p. 1 - 10
ISSN:
1932-6203
Resumen:
Coalescent theory provides powerful models for population genetic inference and is now increasingly important in estimates of divergence times and speciation research. We use molecular data and methods based on coalescent theory to investigate whether genetic evidence supports the hypothesis of A. pretreiandA. tucumanaas separate species andwhether genetic data allow us to assess which allopatric model seems to better explain the diversification process in these taxa. We sampled 13 A. tucumanafrom two provinces in northern Argentina and 28 A. pretreifrom nine localities of Rio Grande do Sul, Brazil. A 491 bp segment of the mitochondrial gene cytochrome c oxidase I was evaluated using thehaplotype network and phylogenetic methods. The divergence time and other demographic quantities were estimated using the isolation and migration model based on coalescent theory. The network and phylogenetic reconstructions showed similar results, supporting reciprocal monophyly for these twotaxa. The divergence time of lineage separation was estimated to be approximately 1.3 million years ago, which corresponds to the lower Pleistocene. Our results enforce the current taxonomic status for these two Amazon species. They also support thatA. pretreiandA. tucumanadiverged with little or no gene flow approximately 1.3 million years ago, most likely after the establishment of a small population in the Southern Yungas forest by dispersion of a few founders from theA. pretreiancestral population. This process may have been favored by habitat corridors formed in hot and humid periods of the Quaternary. Considering that these two species are considered threatened, the results were evaluated for their implications for the conservation of these two species.