Short Communications Body Size and Longevity in Birds
نویسندگان
چکیده
The concept of physiological time was introduced by Hill ( 1951)). He reasoned that as metabolic rate and longevity change with body size, time itself may be scaled. Hence, spans such as growth to maturity, gestation period and the time required for digestion transpire on a time scale dependent upon the body size of an animal. Since Hill’ s hypothesis, many of these rate variables have been examined in birds and mammals and related allometrically to their body size (Stahl 1962, Aschoff and Pohl 1970, Calder 1974). These allometric or power function equations have the form:
منابع مشابه
Group-foraging is not associated with longevity in North American birds.
Group-foraging is common in many animal taxa and is thought to offer protection against predators and greater foraging efficiency. Such benefits may have driven evolutionary transitions from solitary to group-foraging. Greater protection against predators and greater access to resources should reduce extrinsic sources of mortality and thus select for higher longevity according to life-history t...
متن کاملAn analysis of the relationship between metabolism, developmental schedules, and longevity using phylogenetic independent contrasts.
Comparative studies of aging are often difficult to interpret because of the different factors that tend to correlate with longevity. We used the AnAge database to study these factors, particularly metabolism and developmental schedules, previously associated with longevity in vertebrate species. Our results show that, after correcting for body mass and phylogeny, basal metabolic rate does not ...
متن کاملMetabolism and longevity: is there a role for membrane fatty acids?
More than 100 years ago, Max Rubner combined the fact that both metabolic rate and longevity of mammals varies with body size to calculate that "life energy potential" (lifetime energy turnover per kilogram) was relatively constant. This calculation linked longevity to aerobic metabolism which in turn led to the "rate-of-living" and ultimately the "oxidative stress" theories of aging. However, ...
متن کاملSYMPOSIUM Metabolism and longevity: Is there a role for membrane fatty acids?
Synopsis More than 100 years ago, Max Rubner combined the fact that both metabolic rate and longevity of mammals varies with body size to calculate that ‘‘life energy potential’’ (lifetime energy turnover per kilogram) was relatively constant. This calculation linked longevity to aerobic metabolism which in turn led to the ‘‘rate-of-living’’ and ultimately the ‘‘oxidative stress’’ theories of a...
متن کاملBats and birds: Exceptional longevity despite high metabolic rates.
Bats and birds live substantially longer on average than non-flying mammals of similar body size. The combination of small body size, high metabolic rates, and long lifespan in bats and birds would not seem to support oxidative theories of ageing that view senescence as the gradual accumulation of damage from metabolic byproducts. However, large-scale comparative analyses and laboratory studies...
متن کامل