The Rule And Allen 's Rule

988 Words Dec 5th, 2014 4 Pages
According to Bergmann’s (1847) rule and Allen’s (1877) rule, animals that live in warmer climates are likely to be smaller than their counterparts in colder climates and those that live in colder climates will have a low surface area to volume ration in order to retain heat, respectively. Similarly, Allen’s rule is often used in respect to latitude rather than mean annual temperature. This is the most basic form of the rules of evolution in relation to climate; a colder climate leads to a stockier build, and a warm climate leads to a more slender one. In general, this is true of Homo sapiens, as people living in colder climates tend to have shorter lengths and stockier builds. A 1953 study carried out by Derek Frank Roberts (1953), the Emeritus Professor of Human Genetics at Newcastle University, found a clear correlation between body mass and mean annual temperature in human beings. A more recent study carried out by Peter T. Katzmarzyk and William R. Leonard (1998) illustrates a similar trend, although the results were less apparent than those of Roberts (1953). Both studies used bivariate regression and correlation analyses to determine the link betwixt mass (specifically BMI) and mean annual temperature. When compared, it is apparent that humans in tropical climates have relatively long limbs and slender frames in comparison to humans in cold climates. The most interesting find of the study, however, were the changes that had taken place in the span of time between the…
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