Anuran assemblage composition and distribution at a modified environment in Três Marias reservoir, south-eastern Brazil

Natural History ofAmeerega flavopicta(Dendrobatidae) on an Island Formed by Três Marias Hydroelectric Reservoir in Southeastern Brazil

“…A previous study of the anuran assemblage of Pirapitinga showed that habitat structure is an important determinant of species composition and abundance at the island shores (Barata, 2008). The density we recorded for A. flavopicta was similar to the density observed in previous years at the island shores (37.6 individuals per ha; Torres and Eterovick, 2010). However, in their study, Torres and Eterovick (2010) sampled all the habitat types available at the shore, whereas we concentrated our sampling in the habitat type where A. flavopicta occurs.…”

“…The density we recorded for A. flavopicta was similar to the density observed in previous years at the island shores (37.6 individuals per ha; Torres and Eterovick, 2010). However, in their study, Torres and Eterovick (2010) sampled all the habitat types available at the shore, whereas we concentrated our sampling in the habitat type where A. flavopicta occurs. Under these circumstances, the density should be higher in our study.…”

When partitioning is not an option: Resource availability predicts intraguild interactions in two isolated Amazonian primate assemblages

“…However, resource acquisition through interference usually depends on the quality, availability, and monopolizability of resources (Isbell, 1991). If large patches of food resources are evenly distributed and if resources are sufficient, competitive interactions can be mitigated and many species with similar niches can occur simultaneously with high habitat overlap (e.g., Torres & Eterovick, 2010). However, when resources are patchily distributed and scarce, direct and exploitative effects of interactions can have severe impacts on individual survival and species persistence.…”