Energy expenditure increases during the active season in the small, free-living hibernator Muscardinus avellanarius

Energy expenditure increases during the active season in the small, free-living hibernator Muscardinus avellanarius
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小型、自由生活的冬眠动物 Muscardinus avellanarius 在活跃季节的能量消耗会增加

DOI:
10.1016/j.mambio.2013.12.002
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发表时间:
2013
期刊:
影响因子:
1.6
通讯作者:
Dausmann
Dausmann
中科院分区:
生物学3区
文献类型:
--
作者:
Pretzlaff;Dausmann

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人们对小型哺乳动物在夏季减少能量消耗的策略知之甚少。为了了解环境条件是否影响小型自由生活冬眠者的恒温能量需求,我们在现场测量了榛睡鼠(Muscardinus avellanarius)的代谢率。此外,我们的目的是揭示哪些变量会影响麻木的使用。我们的研究结果表明,榛睡鼠改变了夏季的常温能量消耗,但其对环境条件的反应并不像预期的那样。冬眠苏醒后,低温静息代谢率最低,直到 8 月底增加约 95%。这种增加的很大一部分可能是由于不同月份性别和降雨对能量需求的影响变化、食物质量和数量的变化以及冬眠期间萎缩的器官的可逆性尺寸变化造成的。当天气较冷、白天较早时以及体重较轻的个体中,榛睡鼠的麻木状态发生得更频繁。 Torpor 通常用于雄性和非生育雌性。我们发现,与之前仅通过调查巢箱来使用视觉证据来证明麻木使用情况的研究相比,麻木的使用频率更高。
Little is known about strategies employed by small mammals to reduce energy expenditure during the summer. To understand whether ambient conditions impact euthermic energy demands in a small free-living hibernator, we measured metabolic rate of hazel dormice (Muscardinus avellanarius) in the field. Furthermore, we aimed to reveal which variables influence torpor use. Our results show that hazel dormice altered euthermic energy expenditure during summer but not as expected as a response to environmental conditions. Euthermic resting metabolic rate was lowest directly after emergence from hibernation and increased by about 95% until the end of August. A considerable part of this increase was presumably caused by the changing influence of gender and rain on energy demands during different months, variation in food quality and quantity, and reversible size changes of organs that had been atrophied during hibernation. Torpor use in hazel dormice occurred more frequently when it was colder, earlier during the day, and in lighter individuals. Torpor was used routinely in males and non-reproductive females. We show that torpor is used more frequently than previously suggested by studies that only used visual proof of torpor use by surveying nest boxes.
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