This has been used to explain Bergmann's rule
, the geographic pattern of increasing size with decreasing temperature that is seen in some groups of animals.
Past studies have provided support for this phenomenon, called Bergmann's rule
(Bergmann 1847), in both terrestrial (Lindsey 1966) and marine systems (Caselle et al.
The most widely recognized generalization for body size is Bergmann's rule
: the observation that within species or among closely related species--endothermic and some ectothermic vertebrates tend to be larger in relatively cool climates (Ashton2002; Angilletta et al.--2004; de Queiroz & Ashton--2004); and this theory as well has been widely supported in amphibians (Olalla-Tarraga & Rodriguez--2007; Ma--Tong--& Lu2009; Liao--Lu--Shen--& Hu--2010a; Liao & Lu--2010).
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
. This principle states that for critters that are broadly distributed, the ones living further away from the equator typically have larger body sizes.
Remarkably, for some ectotherms the same rule applies, too, but in others a converse pattern (called a converse Bergmann's rule
) is observed.
Black bears generally follow "Bergmann's Rule
," which theorizes that individuals within a given species grow larger the farther north or south from the equator, this to better retain heat in colder climates.
In recent years, many studies have tested Bergmann's rule
for various ectotherm taxa and have found a wide range of patterns depicting the connection between body size and environmental gradient [16, 18, 24-27].
The positive association between the SAB and PL and increasing elevation is in accordance with Bergmann's rule
(1847), that species and populations are larger in colder geographic areas.
Heftier animals have a smaller surface area-to-volume ratio, which helps reduce heat loss - a pattern known as Bergmann's Rule
This difference in size is consistent with Bergmann's rule
(Bergmann, 1847) that described an increase in size of a species as latitude increases or environmental temperature decreases.