Bergmann's rule is size-related in European newts (Triturus)
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The validity of Bergmann's rule - which describes the intraspecific increase in body size with increasing altitude - was studied in a several populations of three European newt species. There was a positive correlation between body size and altitude for smaller-bodied Triturus vulgaris and T. alpestris species, but no relationship between body size and altitude for the much larger sized T. carnifex. Body size therefore plays a role in the application of Bergmann's rule to European newts.
Source:Herpetological Journal, 2005, 15, 3, -206