Thermal physiology and energetics in male desert hamsters (Phodopus roborovskii) during cold acclimation
Thermal physiology and energetics in male desert hamsters (Phodopus roborovskii) during cold acclimation
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DOI：
10.1007/s00360-010-0506-6
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发表时间：
2011-01-01
影响因子：
2
通讯作者：
Wang, De-Hua
中科院分区：
文献类型：
--
作者：
Chi, Qing-Sheng;Wang, De-Hua
对5℃驯化4周的雄性荒漠仓鼠的热生理和能量调节进行了研究。与对照组相比，冷习服动物的平均核心体温降低了0.21摄氏度。进一步分析表明，冷驯化过程中，冷驯化过程中，温度的下降主要发生在暗期，而光期核心体温基本保持不变。冷习服仓鼠的产热能力(以静息代谢率和非颤抖产热能力表示)分别从1.38+/-0.05和5.32+/-0.30增加到1.77+/-0.08和8.79+/-0.31MLO(2)g(-1)h(-1)。经过冷驯化后，沙漠仓鼠的体重保持在相对稳定的21.7+/-0.1克，与保持在23摄氏度(21.8+/-0.1克)的对照组非常相似。冷习服仓鼠的摄食量和消化能(代谢能)平均值分别为5.3+/-0.1g/(-1)和76.3+/-0.9kJ/(-1)(74.8+/-0.9)，分别比对照组显著提高76.7%和80.4%。冷驯化动物的表观消化率为81.0+/-0.3%，也高于对照组的79.7+/-0.2%。这种增长与消化道形态的适应性调整相对应，总长度和湿重分别增加了20.2%和36.8%。冷习服仓鼠的体脂质量和血清瘦素水平分别下降了40.7%和67.1%。车轮转动，车轮开始运转的时间保持不变。我们的研究表明，沙漠仓鼠在冷驯化过程中保持非常活跃的状态，并在热生理和能量代谢方面表现出适应性变化，例如提高了产热和能量处理能力。
The adjustments in thermal physiology and energetics were investigated in male desert hamsters (Phodopus roborovskii) which were acclimated to 5 degrees C for 4 weeks. Mean core body temperature in cold acclimated animals decreased by 0.21 degrees C compared with controls. Further analysis revealed that the decrease mainly occurred in the scotophase, while in the photophase core body temperature remained constant during the whole cold acclimation. Thermogenic capacity, represented by resting metabolic rate and nonshivering thermogenesis increased in cold acclimated hamsters from initial values of 1.38 +/- 0.05 and 5.32 +/- 0.30 to 1.77 +/- 0.08 and 8.79 +/- 0.31 mlO(2) g(-1) h(-1), respectively. After cold acclimation, desert hamsters maintained a relative stable body mass of 21.7 +/- 0.1 g very similar to the controls kept at 23 degrees C(21.8 +/- 0.1 g). The mean values of food intake and digestible energy (metabolisable energy) in cold acclimated hamsters were 5.3 +/- 0.1 g day(-1) and 76.3 +/- 0.9 kJ day(-1) (74.8 +/- 0.9), respectively, which were significantly elevated by 76.7 and 80.4% compared to that in control group. The apparent digestibility was 81.0 +/- 0.3% in cold acclimated animals which was also higher than the 79.7 +/- 0.2% observed in controls. This increase corresponded with adaptive adjustments in morphology of digestive tracts with 20.2 and 36.8% increases in total length and wet mass, respectively. Body fat mass and serum leptin levels in cold acclimated hamsters decreased by 40.7 and 67.1%, respectively. The wheel running turns and the onset of wheel running remained unchanged. Our study indicated that desert hamsters remained very active during cold acclimation and displayed adaptive changes in thermal physiology and energy metabolism, such as enhanced thermogenic and energy processing capacities.