Geographic and Sexual Variations in Body Size, Morphology, and Diet among Five Populations of Green Pythons (Morelia viridis)

Abstract

Abstract Body sizes and morphological traits of animals are often strongly influenced by their diet. Several studies have shown this to be true for snakes and have linked intraspecific differences in these attributes to geographic and sexual variations in prey sizes and diet. To help clarify anecdotal reports of morphological variation among populations of Green Pythons (Morelia viridis), we assessed geographic and sexual variations in the body size, morphology, and diet of 908 individuals from five sites in Australia and New Guinea. Body sizes and morphology differed among populations and, although some variation could be explained by sampling biases, we found no significant geographic dietary variation to help explain these differences. Juvenile Green Pythons preyed exclusively on small lizards and adults preyed on mammals, while birds comprised only 2.5% of all dietary records. Within all populations females grow to larger body sizes, although we observed little sexual dimorphism in other traits. Males...