Dados do Trabalho

Título

RIVERS AS A GENETIC BARRIER IN ATELES HYBRIDUS AND CEBUS VERSICOLOR IN THE MIDDLE MAGDALENA REGION, COLOMBIA

Resumo

<p>The high species richness of tropical regions has been attributed to ecological, evolutionary and biogeographic processes that promote diversification. Regarding to the biogeographic processes, many studies have focused on the causes of species isolation with the premise that physical and ecological barriers restrict genetic flow between populations. The riverine barrier hypothesis confers a major role to rivers since populations of species that are isolated on opposite margins could gradually diverge to separate lineages. In order to evaluate the effect of three rivers, with different size, on the genetic differentiation in <em>Ateles hybridus</em> and C<em>ebus versicolor</em>, we collected 80 feces samples of <em>A hybridus </em>and 145 of C versicolor and genotyped them using panels of 9 and 11 microsatellites, respectively. The samples are distributed in locations to the west and east of the Magdalena River (the largest), north and south of the Carare River and west and east of the San Juan River (the smallest). The average number of alleles observed is 6.9 for<em> A hybridus </em>and 8.5 for<em> C versicolor </em>and the heterozygosity observed has not been significantly higher than expected. However, according to the obtained Fst values between pairs of locations, some structuring is observed in A hybridus populations between western and eastern locations of the Magdalena River. Additionally, the net nucleotide distance in samples of A hybridus is greater between locations of opposite banks of the Magdalena river than among those located in the same bank (0.333 and 0.145 respectively). Despite not being agents of lineage diversification, our preliminary results suggest that there is an effect of the Magdalena River on the genetic structure between groups, evidenced mainly for A hybridus populations.</p>

Financiamento

<p>Banco de la República de Colombia, The Mohamed bin Zayed Species Conservation Fund, Primate Action Fund.</p>

Palavras-chave

<p>Phylogeography; Population genetics; Primates</p>

Área

Área 5 - Genética