Institute of Zoology, Graduate University of Chinese Academy of Sciences, Beijing, China.
Behav Brain Res. 2010 Apr 2;208(2):497-501. doi: 10.1016/j.bbr.2009.12.027. Epub 2010 Jan 4.
Bats (Chiroptera) are the second-most abundant mammalian order in the world, occupying a diverse range of habitats and exhibiting many different life history traits. In order to contribute to this highly underrepresented group we describe the sleep architecture of two species of frugivorous bat, the greater short-nosed fruit bat (Cynopterus sphinx) and the lesser dawn fruit bat (Eonycteris spelaea). Electroencephalogram (EEG) and electromyogram (EMG) data were recorded from multiple individuals (>or=5) by telemetry over a 72-h period in a laboratory setting with light/dark cycles equivalent to those found in the wild. Our results show that over a 24-h period both species spent more time asleep than awake (mean 15 h), less than previous reported for Chiroptera (20 h). C. sphinx spent significantly more of its non-rapid eye movement sleep (NREM) and rapid eye movement sleep (REM) quotas during the light phase, while E. spelaea divided its sleep-wake architecture equally between both light and dark phases. Comparing the sleep patterns of the two species found that C. sphinx had significantly fewer NREM and REM episodes than E. spelaea but each episode lasted for a significantly longer period of time. Potential hypotheses to explain the differences in the sleep architecture of C. sphinx with E. spelaea, including risk of predation and social interaction are discussed.
蝙蝠（翼手目）是世界上第二丰富的哺乳动物目，占据了各种各样的栖息地，并表现出许多不同的生活史特征。为了对这个高度代表性不足的群体做出贡献，我们描述了两种食果蝙蝠（大短鼻果蝠（Cynopterus sphinx）和小曙果蝠（Eonycteris spelaea）的睡眠结构。在实验室环境中，通过遥测记录了多个个体（≥5）的脑电图（EEG）和肌电图（EMG）数据，光/暗周期与野外相似。我们的结果表明，在 24 小时内，两种蝙蝠的睡眠时间都比清醒时间长（平均 15 小时），低于以前报道的翼手目（20 小时）。C. sphinx 在光相期间，其非快速眼动睡眠（NREM）和快速眼动睡眠（REM）配额显著增加，而 E. spelaea 在光相和暗相之间平均分配其睡眠-觉醒结构。比较两种蝙蝠的睡眠模式发现，C. sphinx 的 NREM 和 REM 发作次数明显少于 E. spelaea，但每次发作持续的时间明显更长。解释 C. sphinx 与 E. spelaea 的睡眠结构差异的潜在假说，包括捕食风险和社会互动，都进行了讨论。
