Temperature-associated upper limits to body size in terrestrial poikilotherms
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چکیده
منابع مشابه
Gigantism, temperature and metabolic rate in terrestrial poikilotherms.
The mechanisms dictating upper limits to animal body size are not well understood. We have analysed body length data for the largest representatives of 24 taxa of terrestrial poikilotherms from tropical, temperate and polar environments. We find that poikilothermic giants on land become two-three times shorter per each 10 degrees of decrease in ambient temperature. We quantify that this diminut...
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Power laws describing the dependence of metabolic rate on body mass have been established for many taxa, but not for prokaryotes, despite the ecological dominance of the smallest living beings. Our analysis of 80 prokaryote species with cell volumes ranging more than 1,000,000-fold revealed no significant relationship between mass-specific metabolic rate q and cell mass. By absolute values, mea...
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An optimality model relating the rate of biosynthesis to body temperature and gene duplication is presented to account for several observed patterns of genome size variation. The model predicts (1) that poikilotherms living in a warm climate should have a smaller genome than poikilotherms living in a cold climate, (2) that homeotherms should have a small genome as well as a small variation in g...
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The generally accepted view that rates of oxygen consumption of tissues and poikilotherms increase regularly with rising temperature was subjected to careful examination using brain slices and skin of rats and nine different species of aquatic and terrestrial animals. It was found that, although there are statements in the literature to the contrary, the influence of temperature is a regular on...
متن کاملLyons J M & Raison J K. A temperature-induced transition in mitochondrial oxidation: contrasts between cold and warm-blooded animals. Comp. Biochem. Physiol. 37:405-11, 1970
00 succinate oxidase activity of liver mitochondria from homeotherms and poikilotherms. For the poikilotherms, Arrhenius-type plots were linear over the temperature range 4°to 30°C. In contrast, for the homeotherms, the plots were biphasic with a ‘break” or “discontinuity” at about 23°Cand an increase in Arrhenius activation energy in the temperature range beiow the “break.” The results suggest...
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تاریخ انتشار 2005