ID do Resumo: 504

Geographical and ecological modeling on Saguinus bicolor and relationship with the peripatric Saguinus midas in Central Amazonia, Brazil.

The two species, Saguinus bicolor (Spix, 1823) and S. midas (Linnaeus, 1758), have an uncommon biogeographic relationship among the Brazilian primates. They are parapatric species and this geographic segregation is not delimited by physical barriers. The occurrence of hybrids also was never reported. Saguinus bicolor have one of the most accentuated endemism among the Amazonian species of primates and is one of the most threatened to extinction, being the only one Callitrichidae in the Brazilian red list (IBAMA). This study is focused on the geographic distributions of the two Saguinus species. Special attention is given to the contact zone between them both, attempting a real contribution for the species conservation. Records obtained between the Cuieiras and Uatumã rivers (Amazonas State) were used to generate predictive geographic distribution maps and the geographic contact zone probable of these two species. Distributional predictions of both Saguinus species corroborate the alternative hypothesis: the variables analyzed in this work do not determine the geographic segregation; interaction determining the peripatry is suggested instead. Apparently, mixed groups may be stables or temporaries; this association was never before reported and occurs at least in the rain season, when resources are abundant in Amazon terra-firme forests. The hypothesis of peaceful interaction, at least in rainy season, as a replacement for previous reports of invariably agonistic display is herein adopted. Data given by Ayres et al. (1982) are compared with the raised for this study. An analysis of variation of geographic distribution of the species is provided based on previous study of decade of 1980. The occurrence of S. bicolor has been largely reduced when compared with past information (1982), mainly at the left bank of Urubu river.

Sessão:  Biodiversidade - Modelagem da biodiversidade Amazônica: presente e futuro. (B)

Tipo de Apresentação:  Oral