Ectother's Metabolic Rate

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It was observed that the hamster had a significantly greater carbon dioxide production rate than the cricket on a gram for gram basis. The greater dependence on metabolic activity for thermoregulation by the hamster, which is an endotherm, than ectotherms such as the cricket may explain this difference. Ectotherms regulate their body temperature by using heat generated from their surroundings, while endotherms use a portion of their sustenance as fuel for internal generation of heat. To maintain a body temperature typically greater than that of their surrounding environment, mammals, including hamsters, may generate heat by increasing their metabolic rate and by expressing thermogenin, an uncoupling protein in brown adipose tissue. Thermogenin transports protons into the mitochondrial matrix …show more content…

Unlike hamsters, crickets are ectotherms and have an internal temperature similar to that of their surroundings. Since the kinetic energy of particles is directly proportional to the temperature, and enzymes have optimal efficiency in specific temperature ranges, body temperature has an influence on an organism’s metabolic rate. To regulate body temperature, crickets may have behavioural adaptations such as varying the duration of being exposed to the sun and being in the shade. Thus, under study in a thermally homogenous environment, the cricket’s metabolic rate may be affected by the laboratory’s temperature and consequently might be slower than their metabolic rate in their natural habitat, which may have a higher temperature. Likewise, Nespolo et al. (2003) showed that the average rate of oxygen consumption of Hophlosphyrum griseus, a cricket species from central Chile, varied between 3.07 ± 0.69 µl·O2 h-1 at an ambient temperature of 7°C to 17.14 ± 6.83 µl·O2 h-1 at an ambient temperature of

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