| Crynodeb: | This study was done in Nukak Natural Reserve, at Guaviare department - Colombia, during the summer season. Eight different sites were grouped into three types of forest: non- inund ed terrain forest, annually flooded forest and natural savanna. The forests were classified in accordance with the kind of soil and vegetation structure and composition. The sampling was made with pit fall trap bait human excrement, intersection traps and manual capture. 1556 individuáis distributed in 48 species and 14 genera were captured. The accumulation curves, asymptotic modeis and richness estimations using no parametric methods showed that capture included more that 90% of species at the sampled area. Both, richness (x2= 18.74; p = 0.009) and abundance (x2= 416.08; p = 0.001) are dependent on the site where the capture was done. The ncm-inundated terrain forest showed the biggest richness and abundance, and the lowest was found in the savanna. The species exchange between the different types of forest was low. Changes according to the body size and the relocation habit among different type of forests were found. There was a high small tunnelers predominance in the non-inundated terrain forest and the annually flooded forest. In the savanna the rollers species were predominant.
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