Eventos geológicos e climáticos influenciando o padrão filogeográfico de aves na América do Sul: enfoque em Amazona (Psittacidae) e dendrocolaptes ( dendrocolaptidae)
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2012-05-25
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Universidade Federal de Goiás
Resumo
During the wet periods of the Quaternary the existence of faunistic corridors along
the Chaco were proposed,which allowed the contact between the forest areas of
Brazil and Argentina currently separated by this biome. Amazona tucumana and
Amazona pretrei are considered allospecies that occurin Yungas forests and
Araucaria forests, respectively. The understanding of speciation process of this
lineage might contribute to comprehension of the influence of these corridors on the
biogeography of birds of South America.Thus, this study aims to evaluate the
influence of climatic and geological processes in the formation of these two species
of parrots.Considering also that these two species were classified as vulnerable by
IUCN, the study of the speciation process may provide subsidies for conservation.
The genetic relationship between haplotypes and demographic processes were
investigated based on a segment of 491 base pairs of the mitochondrial gene
cytochrome oxidase I (COI).. In addition, weestimated the divergence time between
populations of these species based on the theory of coalescence.The variability and
average genetic distance in A. pretrei are higher than in A. tucumana.There was no
evidence for any expansion of the species population.The divergence of these
species must have occurred in the absence of gene flow for at least one million years
ago.Based on data divergence is possible to propose that the lineage A. tucumana /
pretreihas appeared in southern Brazil.Possibly the ancestral lineage used the
existing forest corridors along the Chaco during the Pleistocene and occupied the
Yungas forests.Data of genetic variability, support the current status of vulnerable to
Amazona tucumana.
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ROCHA, Amanda Vaz. Eventos geológicos e climáticos influenciando o padrão filogeográfico de aves na América do Sul: enfoque em Amazona (Psittacidae) e dendrocolaptes ( dendrocolaptidae). 2012. 48 f. Dissertação (Mestrado em Ecologia e Evolução) - Universidade Federal de Goiás, Goiânia, 2012.