Waking to drink: rates of evaporative water loss determine arousal frequency in hibernating bats
Waking to drink: rates of evaporative water loss determine arousal frequency in hibernating bats
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DOI：
10.1242/jeb.078790
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发表时间：
2013-02-01
影响因子：
2.8
通讯作者：
Pinshow, Berry
中科院分区：
文献类型：
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作者：
Ben-Hamo, Miriam;Munoz-Garcia, Agusti;Pinshow, Berry
蝙蝠冬眠是为了科普冬季的低环境温度（T-a）和低食物供应。然而，当蝙蝠将体温（T-b）和代谢率（MR）提高到正常体温水平时，冬眠经常会被唤醒打断。唤醒占蝙蝠冬季能量消耗的85%以上。这与T-b、T-a或两者的变化相关，导致单一可检验的预测，即，麻痹回合长度（TBL）与T-a和T-b负相关。T-a和T-b都被发现与TBL相关，但相关性本身不能建立唤醒与T-b或T-a之间的因果关系。由于水合状态也与冬眠中的觉醒有关，我们假设冬眠期间的水分流失导致蝙蝠需要唤醒饮水。在相同T-a、不同湿度条件下测定了库利伏翼（Pipistrelluskuhlii）的总生物量，发现总生物量与总蒸发失水量呈反比关系，与代谢率无关，直接支持了蝙蝠的水合状态是唤醒的一个线索的假说。
Bats hibernate to cope with low ambient temperatures (T-a) and low food availability during winter. However, hibernation is frequently interrupted by arousals, when bats increase body temperature (T-b) and metabolic rate (MR) to normothermic levels. Arousals account for more than 85% of a bat's winter energy expenditure. This has been associated with variation in T-b, T-a or both, leading to a single testable prediction, i.e. that torpor bout length (TBL) is negatively correlated with T-a and T-b. T-a and T-b were both found to be correlated with TBL, but correlations alone cannot establish a causal link between arousal and T-b or T-a. Because hydration state has also been implicated in arousals from hibernation, we hypothesized that water loss during hibernation creates the need in bats to arouse to drink. We measured TBL of bats (Pipistrellus kuhlii) at the same T-a but under different conditions of humidity, and found an inverse relationship between TBL and total evaporative water loss, independent of metabolic rate, which directly supports the hypothesis that hydration state is a cue to arousal in bats.