Distribution of frogs in riparian areas of an urban forest fragment in Central Amazonia

this study aimed to evaluate how environmental variables (width of valley, stream size, forest edge distance, and leaf-litter depth) affect the abundance and richness of species of frog species in riparian areas of an urban forest fragment in central amazonia. the study was conducted at the campus of the universidade federal do amazonas, manaus, brazil, between may 2008 and april 2009, when three nocturnal and diurnal samples were taken from ten plots. a total of 17 species belonging to seven families were registered. the number of species recorded per plot varied from seven to 14. we detected a relationship between the edge distance and richness: the plots with lower richness were located near the fragment border. the variables had no significant effect on abundance of each species.