IBS   24490
INSTITUTO DE BIOLOGIA SUBTROPICAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
The footprints left by chloroplast: contributions to understand the evolutionary history of Seasonally Dry Tropical Forests
Autor/es:
GARCÍA, M.V.; ZERDA MOREIRA, A; BARRANDEGUY, M.E.
Lugar:
Posadas
Reunión:
Congreso; 2018 International Congress of genetics; 2018
Institución organizadora:
Sociedad Brasilera de Genética - Sociedad Argentina de Genética
Resumen:
The current discontinuous distribution of Seasonally Dry Tropical Forests (SDTFs) is well represented by a native South American forest tree, Anadenanthera colubrina var. cebil also known as curupay, which makes it an interesting species for phylogeographic studies. The aim of this study was to analyze the historical and demographic relationship between Argentinian populations from two nodal areas: Misiones and Sub-Andean Piedmont nucleus, considering the evolutionary history from these forests. A total of 119 individuals from different natural populations where analyzed using three DNA chloroplast microsatellite markers. Genetic diversity was characterized using Nei´s haplotypic diversity index. The genetic structure was analyzed using a Bayesian model-based clustering approach and the phylogenetic relationships among haplotypes were represented in a Median-Joining network. Competing hypothetical evolutionary scenarios characterized by divergence, time of divergence and changes in population size events were tested with Approximate Bayesian Computation method. Fifteen haplotypes were identified and high values of genetic diversity were detected. Individuals were grouped into six clusters, individuals from Misiones nucleus were assigned to four of them while individuals from Sub-Andean Piedmont nucleus were assigned to the remaining two clusters. Haplotypes were grouped in the network according to SDTFs nucleus. The most likely evolutionary scenario shows that analyzed populations were originated from a unique event of ancestral divergence during the Late Pleistocene which is congruent with the Pleistocene Arch Hypothesis that suggests a more extensive and continuous distribution of SDTF during dry and cold cycles of this time.