These results enable us to identify the factors associated with the patterns of amphibian species richness on complex environmental gradients, and pose hypotheses concerning the mechanisms responsible. There was a clear effect of annual variation in hydroperiod on species richness; the number of species in a pond was positively related to hydroperiod across years (average slope of regressions across all 29 ponds where hydroperiod varied was 2.8±0.5, t=5.5, DF=28, p<0.001).

Citation: Werner EE, Skelly DK, Relyea RA, Yurewicz KL. 2007. Amphibian species richness across environmental gradients. OIKOS 116 (10): 1697-1712