Bergmann’s rule states that within a species of endotherms smaller individuals are found in warmer conditions, which is consistent for nearly all endotherms, while in ectotherms body size patterns are less consistent. As ectothermic vertebrates, the morphology of amphibians is likely impacted by climatic conditions. Here, we examined latitudinal variation in body size in the ranid frog, Fejervarya limnocharis, based on literature and our own data on mean body size of 3637 individuals from 50 populations and average age of 2873 individuals from 40 populations in China. The results showed that body size was positively correlated with environmental temperature, but not with precipitation. Body size was negatively correlated with latitude among populations in this species, which supported the inverse of Bergmann’s rule. Our findings suggest that a larger body size in low-latitude populations is associated with a longer growing season related to the higher environmental temperature.
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JinL.YangS.N.LiaoW.B. & LüpoldS. (2016) Altitude underlies variation in the mating system, somatic condition, and investment in reproductive traits in male Asian grass frogs (Fejervarya limnocharis). Behav. Ecol. Sociobiol.701197-1208.
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MaiC.L.LiaoJ.ZhaoL.LiuS.M. & LiaoW.B. (2017) Brain size evolution in the frog Fejervarya limnocharis does neither support the cognitive buffer nor the expensive brain framework hypothesis. J. Zool.30263-72.
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