REDUCTION OF METABOLISM DURING HIBERNATION AND DAILY TORPOR IN MAMMALS AND BIRDS - TEMPERATURE EFFECT OR PHYSIOLOGICAL INHIBITION
REDUCTION OF METABOLISM DURING HIBERNATION AND DAILY TORPOR IN MAMMALS AND BIRDS - TEMPERATURE EFFECT OR PHYSIOLOGICAL INHIBITION
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DOI：
10.1007/bf00692726
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发表时间：
1988-01-01
影响因子：
2
通讯作者：
GEISER, F
中科院分区：
文献类型：
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作者：
GEISER, F
本研究解决了恒温动物在冬眠期间能量代谢的减少是否严格是温度的物理效应（Q10）或是否涉及额外的代谢抑制的争议。基础代谢率（BMR，以耗氧量衡量）。本文收集了68种哺乳动物和鸟类（n = 58）的VO2、冬眠时的代谢率和相应的体温（Tb），这些数据来自文献（n = 58）或本研究（n = 10）。Q10的变化。ovrhdot。冬眠动物（表现出长时间冬眠的物种）的正常体温和冬眠之间的VO2从平均4.1降至2.8，Tb从30降至< 10℃。在日异温动物（表现出浅的、日冬眠的物种）中，随着结核的减少，Q10保持在2.2的恒定值。在Tb < 10℃的冬眠者中，Q10与体重呈负相关。在正常体温（BMR）期间观察到的质量特定代谢率随体重下降而增加，而在冬眠期间没有观察到，代谢率和质量相关斜率几乎为零。日异温动物的辅酶Q10小于冬眠动物，但辅酶Q10与体重无负相关关系，因此在相同温度下冬眠时的代谢率高于冬眠动物。这些发现表明，日常异温动物和大型冬眠动物在冬眠期间代谢的减少主要可以用温度效应来解释，而小型冬眠动物在温度效应之外可能使用代谢抑制来减少冬眠期间的能量消耗。
The present study addresses the controversy of whether the reduction in energy metabolism during torpor in endotherms is strictly a physical effect of temperature (Q10) or whether it involves an additional metabolic inhibition. Basal metabolic rates (BMR; measured as oxygen consumption, .ovrhdot.VO2), metabolic rates during torpor, and the corresponding body temperatures (Tb) in 68 mammalian and avian species were assembled from the literature (n = 58) or determined in the present study (n = 10). The Q10 for change in .ovrhdot.VO2 between normothermia and torpor decreased from a mean of 4.1 to 2.8 with decreasing Tb from 30 to < 10.degree.C in hibernators (species that show prolonged torpor). In daily heterotherms (species that show shallow, daily torpor) the Q10 remained at a constant value of 2.2 as Tb decreased. In hibernators with a Tb < 10.degree.C, the Q10 was inversely related to body mass. The increased of mass-specific metabolic rate with decreasing body mass, observed during normothermia (BMR), was not observed during torpor in hibernators and the slope relating metabolic rate and mass was almost zero. In daily heterotherms, which had a smaller Q10 than the hibernators, no inverse relationship between the Q10 and body mass was observed, and consequently the metabolic rate during torpor at the same Tb was greater than that of hibernators. These findings show that the reduction in metabolism during torpor of daily heterotherms and large hibernators can be explained largely by temperature effects, whereas a metabolic inhibition in addition to temperature effects may be used by small hibernators to reduce energy expenditure during torpor.