What are Gloger’s and Rensch's rules?
Gloger's rule is an ecogeographical rule that links animal coloration with climatic variation.
It is named after Constantin W.L. Gloger (1803-1863) , a German zoologist, who in 1833 was one of the first to describe correlations between the pigmentation of animals and temperature.
In its modern version, the rule states: birds and mammals should be darker in humid and warm areas compared to colder and drier areas.
The term ‘Gloger's rule' was coined by a German biologist Bernhard Rensch (1900-1990) (on the right) in 1929.
Rensch's rule explains the relationship between the extent of sexual size dimorphism between genders.
Across species within a lineage, size dimorphism will increase with increasing body size when the male is the larger sex, and decrease with increasing body size when the female is the larger sex.
Examples of phylogenetic lineages that appear to follow this rule include primates, pinnipeds, and artiodactyls.
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