Bergmann's rule

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Related to Bergmann's rule: Gloger's rule

Berg·mann's rule

The principle that in wide-ranging, warm-blooded animal species, individuals living in a cold climate tend to be larger than individuals of that same species living in a warm climate.

[After Carl Bergmann (1814-1865), German biologist.]
References in periodicals archive ?
You go there because of Bergmann's Rule, which states that the farther north in latitude you go, the larger the body mass of large mammals.
Thus, geographical variation of body size in dormice may resemble that in shrews: while some species of genus Sorex conform to Bergmann's rule (Ochocinska & Taylor 2003), others and the water shrew (Neomys fodiens) do not (Yom-Tow & Yom-Tow 2005, Balciauskas et al.
This may seem contrary to a principle most biologists were taught in school called Bergmann's Rule.
Bergmann's Rule clearly states that within any species, all mammals (including us) tend to be larger the farther north or south from the Equator, thus to aid heat retention and energy conservation in colder climates.
According to Bergmann's rule, endotherm (warm blooded) vertebrates living in cooler climates tend to be larger than members of the same genus in warmer climates.
Heftier animals have a smaller surface area-to-volume ratio, which helps reduce heat loss - a pattern known as Bergmann's Rule.
For example, on the basis of Bergmann's rule (below), Van Bushirk et al.
Bergmann's Rule in Nonavian Reptiles: Turtles Follow It, Lizards and Snakes Reverse It.
In its classical sense, Bergmann's rule (Bergmann 1847) proposed that homeothermic animals display size clines; species within a genus are larger in cooler climates and smaller in warmer climates because of selection on the ability to thermoregulate (Bergmann 1847, James 1970, Blackburn et al.
Curiously, one could erroneously conclude that Bergmann's Rule applied if one only examined body size variation without regard to shifts in voltinism (i.
There is a general principle, called Bergmann's Rule, that suggests animals tend to increase their body size in colder environments," Discovery News quoted co-author Xiaoming Wang, as saying.