MACNBR   00242
MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Avian evolutionary history in the southern Neotropics: complex and varied patterns of diversification
Autor/es:
LIJTMAER, DARÍO A.; KOPUCHIAN, CECILIA; BARREIRA, ANA S.; BENITES, PILAR; KERR, KEVIN C. R.; NAOKI, KAZUYA; GÓMEZ, MARÍA ISABEL; TUBARO, PABLO L.
Lugar:
Raleigh, North Carolina
Reunión:
Conferencia; Evolution 2014; 2014
Institución organizadora:
Duke University, USA
Resumen:
Abstract: Even though the study of the evolutionary history of the Neotropics has dramatically increased in the last few years, most work has been done in the Amazonian basin, the Atlantic forest and the northern part of the Andes mountains. By contrast, the southern cone of South America has barely been studied in this regard. This region is particularly interesting because of its high latitude, the occurrence of a diverse array of environments (including the highest peaks of the Andes mountains and the southernmost part of the Yungas and Atlantic Forest regions) and the presence of areas with some of the highest rates of avian diversification worldwide. We used citochrome c oxidase I (COI) sequences (DNA barcodes) from 3,425 specimens belonging to 730 species of Argentinean and Bolivian birds to analyze the patterns of diversification in this region and assess the role of various diversifying factors. Comparison with birds of the Nearctic and lower latitudes of the Neotropics evidenced that diversification patterns in southern South America are complex, consistent with the influence of glacial cycles as well as other factors more typical of the Neotropical realm. Comparisons among different areas of southern South America showed that species endemic to Patagonia and the Andes mountains are younger and less variable than more widely distributed species, and even more so than the northern, more tropical species. This pattern is consistent with a more prominent role of glacial cycles in the Andes and Patagonia and a more stable environment in the northern areas of this region. Finally, seven percent of the species showed high intraspecific variation, usually including deeply divergent lineages. The study of these cases with various algorithms permitted an initial assessment of the presence of evolutionary independent lineages. Further analyses including other molecular markers, morphology and vocalizations will indicate whether these taxa include overlooked species, allowing a better understanding of avian diversity in this region.