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Bergmanns rule

Bergmann's rule The idea that the size of homoiothermic animals in a single, closely related, evolutionary line increases along a gradient from warm to cold temperatures (i.e. that races of species from cold climates tend to be composed of individuals physically larger than those of races from warm climates). This is because the surface area: body weight ratio decreases as body weight increases. Thus a large body loses proportionately less heat than a small one. This is advantageous in a cold climate but disadvantageous in a warm one. The rule was proposed in 1847 by the German zoologist C Bergmann. See also Allen's rule and Gloger's rule.

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"Bergmanns rule." A Dictionary of Ecology. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

"Bergmanns rule." A Dictionary of Ecology. . Encyclopedia.com. (August 23, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/bergmanns-rule-1

"Bergmanns rule." A Dictionary of Ecology. . Retrieved August 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/bergmanns-rule-1

Bergmanns rule

Bergmann's rule The idea, proposed by C. Bergmann in 1847, that the size of homoiothermic animals in a single, closely-related, evolutionary line increases along a gradient from warm to cold temperatures, i.e. that races of species from cold climates tend to be composed of individuals physically larger than those of races from warm climates. This is because the surface-area: body-weight ratio decreases as body weight increases. Thus a large body loses proportionately less heat than a small one. This is advantageous in a cold climate but disadvantageous in a warm one. See also ALLEN'S RULE; and GLOGER'S RULE.

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"Bergmanns rule." A Dictionary of Earth Sciences. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

"Bergmanns rule." A Dictionary of Earth Sciences. . Encyclopedia.com. (August 23, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/bergmanns-rule

"Bergmanns rule." A Dictionary of Earth Sciences. . Retrieved August 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/bergmanns-rule

Bergmann's rule

Bergmann's rule The idea that the size of homoiothermic animals in a single, closely related, evolutionary line increases along a gradient from warm to cold temperatures—i.e. that races of species from cold climates tend to be composed of individuals physically larger than those of races from warm climates. This is because the surface-area: body-weight ratio decreases as body weight increases. Thus a large body loses proportionately less heat than a small one. This is advantageous in a cold climate but disadvantageous in a warm one. See also ALLEN'S RULE; GLOGER'S RULE.

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"Bergmann's rule." A Dictionary of Zoology. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

"Bergmann's rule." A Dictionary of Zoology. . Encyclopedia.com. (August 23, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/bergmanns-rule-0

"Bergmann's rule." A Dictionary of Zoology. . Retrieved August 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/bergmanns-rule-0