Metabolism, thermogenesis and daily rhythm of body temperature in the wood lemming, Myopus schisticolor
Metabolism, thermogenesis and daily rhythm of body temperature in the wood lemming, Myopus schisticolor
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木旅鼠（Myopus schisticolor）的新陈代谢、生热作用和体温的日常节律
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
R. Hissa
中科院分区：
文献类型：
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作者：
S. Saarela;R. Hissa
木旅鼠（Myopus schisticolor）在秋季迁移期间捕获的9月和10月。将动物维持在12°C和12 L：12 D光周期下。研究了旅鼠的基础代谢率和产热能力。基础代谢率为3.54 ml O2·g ~（-1）·h ~（-1），为预期值的215-238%。高基础代谢率似乎是生活在高纬度地区的啮齿动物的典型特征。旅鼠的体温很高（38.0-38.8°C），在24小时记录期间波动不大。高基础代谢率和高体温的行为适应低质量的冬季饮食方面进行了讨论。结果表明，旅鼠的产热能力、保温能力和非颤抖性产热能力分别为53.0 mW·g-1、0.53 mW·g-1·C-1和53.2 mW·g-1，高于预期值。棕色脂肪组织具有典型的产热特性，尽管其呼吸特性相当低，但与其他小型哺乳动物相比，其线粒体蛋白质含量较高。24小时的体温和运动活动记录并没有揭示木旅鼠是否是一种夜行动物。也许，昼夜节律的表达被特殊的进食行为所掩盖。结果表明，旅鼠对寒冷气候的适应性较强。
Wood lemmings (Myopus schisticolor) were captured during their autumnal migration in September and October. The animals were maintained at 12°C and under 12L:12D photoperiod. Basal metabolic rate and thermogenic capacity of the wood lemming were studied. Basal metabolic rate was 3.54 ml O2·g-1·h-1, which is 215–238% of the expected value. The high basal metabolic rate seems to be typical of rodents living in high latitudes. The body temperature of the wood lemming was high (38.0–38.8°C), and did not fluctuate much during the 24-h recording. The high basal metabolic rate and the high body temperature are discussed with regard to behavioural adaptation to a low-quality winter diet. Thermogenic capacity, thermal insulation and non-shivering thermogenesis of the wood lemming displayed higher values than expected: 53.0 mW·g-1, 0.53 mW·g-1·C-1 and 53.2 mW·g-1, respectively. Brown adipose tissue showed typical thermogenic properties, although its respiratory property was fairly low, but mitochondrial protein content was high compared to other small mammals. The 24-h recording of body temperature and motor activity did not reveal whether the wood lemming is a nocturnal animal. Possibly, the expression of a circadian rhythm was masked by peculiar feeding behaviour. It is concluded that the wood lemming is well adapted to living in cold-temperature climates.