Dictionary of Human Evolution and Biology

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Bergmann’s Rule

Tenet that among polytypic and homeothermic species (a) of similar shape, that larger individuals lose heat less rapidly than smaller, and (b) of similar size, that individuals with a linear shape lose heat more rapidly than individuals with a nonlinear shape; the consequence is that populations in colder environments tend to be larger and stouter, on average, than those in mild climates.

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