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首页> 外文期刊>Canadian Journal of Zoology >Metabolic depression during dormancy in the African tortoise Kinixys spekii
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Metabolic depression during dormancy in the African tortoise Kinixys spekii

机译：非洲乌龟Kinixys spekii休眠期间的代谢性抑郁

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Two hypotheses may explain the lack of metabolic depression at low temperature in hibernating reptiles from warm but not cool climates. (1) Physiological ability; reptiles from cool climates have resting metabolic rates elevated at low temperatures and so have greater potential for metabolic depression. (2) Energy benefit; hibernation is generally short in warm climates, so the energy saving possible at low temperature is small. These hypotheses can be separated in a warm-climate reptile that hibernates for a long period, such as the African tortoise Kinixys spekii, which is dormant for 7-8 months a year, in winter and in the following hot dry season. Dormant tortoises had a reduced rate of oxygen consumption ((V) over bar o(2)) between 10 and 25 degrees C compared with resting (V) over bar o(2), measured at the same temperatures in the active season, and at 10-15 degrees C compared with the resting (V) over bar o(2) of controls kept active in winter. These data are consistent with hypothesis 2 but not hypothesis 1. The metabolic rate during dormancy was, on average, 59% of resting (V) over bar o(2) with minimum rates of 47-48% at 10 and 25 degrees C, similar to the minimum rates of about 50% of resting (V) over bar o(2), in other hibernating reptiles. Aestivating ectotherms achieve greater metabolic depression, to about 25% of resting (V) over bar o(2), possibly as a result of reduced gas exchange.
机译：有两个假设可以解释在温暖而不是凉爽的气候下使爬行动物冬眠的过程中，低温缺乏代谢抑制的原因。 （1）生理能力;凉爽气候下的爬行动物在低温下的静息代谢率提高，因此具有更大的代谢抑制潜力。 （2）能源效益;在温暖的气候中，冬眠通常很短，因此在低温下可能节省的能量很小。这些假设可以在长时间休眠的温暖气候爬行动物中分离，例如非洲乌龟Kinixys spekii，每年冬季，随后的炎热干燥季节休眠7-8个月。在活动季节的相同温度下测得，与在o（2）上静息（V）相比，休眠的陆龟在10至25摄氏度之间的耗氧率（o（2）之上的（V））降低。在10-15摄氏度下与冬季保持活动状态的控件o（2）上方的静止（V）相比。这些数据与假设2一致，但与假设1不一致。休眠期间的代谢率平均为bar o（2）上的静息（V）的59％，在10和25摄氏度下的最低比率为47-48％，类似于在其他冬眠爬行动物中，在o（2）栏上静止（V）的最小比率约为50％。刺激性的等温线可达到更大的代谢抑制，超过bar o（2）约占静息（V）的25％，这可能是由于气体交换减少所致。

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