Seasonal variations in sleep of free-ranging Arabian oryx (Oryx leucoryx) under natural hyperarid conditions
Seasonal variations in sleep of free-ranging Arabian oryx (Oryx leucoryx) under natural hyperarid conditions
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DOI：
10.1093/sleep/zsy038
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发表时间：
2018-05-01
期刊：
影响因子：
5.6
通讯作者：
Gravett, Nadine
中科院分区：
文献类型：
--
作者：
Davimes, Joshua G.;Alagaili, Abdulaziz N.;Gravett, Nadine
研究目标：阿拉伯大羚羊生活在阿拉伯沙漠的极度干旱条件下，并表现出季节性活动模式的时间生态位转换。本研究的目的是对自然栖息地中自由漫游的阿拉伯大羚羊的睡眠进行基于多导睡眠图的研究，以确定极端的季节性气候变化是否导致与时间生态位季节性切换相关的睡眠模式和生理学变化。方法：在沙特阿拉伯王国 Mahazat as-Sayd 保护区，记录了冬季自由漫游的阿拉伯大羚羊的脑电图、颈项肌电图、体动记录仪和皮下温度。结果：冬季每日总睡眠时间为 6.69 小时，夏季为 3.77 小时。在冬季，羚羊会表现出体重约 60 公斤的偶蹄类动物所特有的夜间睡眠行为。在夏季，羚羊大部分时间在白天睡觉，皮下温度在睡眠期间上升，但没有周围空气温度上升得那么快。快速眼动睡眠占总睡眠时间的比例非常小，尤其是在夏季。结论：夏季异常的睡眠模式和生理机能似乎与高环境空气温度有关，高环境空气温度影响生存所需的内在和外在因素。阿拉伯羚羊似乎利用睡眠生理学作为炎热夏季的适应性体温调节机制。
Study Objectives: The Arabian oryx lives under hyperarid conditions in the Arabian Desert and exhibits temporal niche switching of activity patterns at a seasonal level. The objective of the current study was to provide a polysomnographicbased study of sleep in free-roaming Arabian oryx in their natural habitat to determine whether extreme seasonal climate variations resulted in changes in sleep patterns and physiology associated with the seasonal switching of temporal niches.Methods: Electroencephalography, nuchal electromyography, actigraphy, and subcutaneous temperature were recorded in free-roaming Arabian oryx in the Mahazat as-Sayd Protected Area, Kingdom of Saudi Arabia during winter and summer.Results: Total daily sleep time in winter was 6.69 and 3.77 hr in summer. In winter, oryx exhibited nocturnal sleep typical of artiodactyls of around 60 kg body mass. In summer, oryx slept mostly during the day and subcutaneous temperature was seen to rise during sleep, but not as rapidly as the rises observed in ambient air temperature. Rapid eye movement sleep formed a very small percentage of total sleep time, especially so in the summer.Conclusions: The unusual sleep patterns and physiology during summer appear to be related to high ambient air temperatures that affect both intrinsic and extrinsic factors necessary for survival. The Arabian oryx appears to use sleep physiology as an adaptive thermoregulatory mechanism in the hot summer months.