Ecological interpretation of a larval community of amphibian anurans

The community of anuran larvae in the valley of Parana River was analyzed o n the basis of feeding spatial-temporal distribution and abiotic factor inf luence studies. Characteristics of microhabitats were registered. Physical and chemical parameters were measured. The food offer was evaluated. Enviro nmental supply and biological characteristics were related. The trophic spe ctrum and diversity were calculated. The trophic relationships were analyze d using overlap matrices. An integral analysis was made using a basic data matrix related to mechanisms of isolated overlaps. A herbivorous-detritivorous diet was observed, mainly composed by planktoni c and benthonic organisms wit no apparent preference of perifiton. The abun dance of tadpoles was mainly related to pluviometric distribution and hydro logical level. No statistically significant differences of diet composition were found. The selection pressure would consist in non-trophic resource d istribution on spatial and temporal dimensions.