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科学家称大象平均每天仅睡两小时 三四天才睡一次
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Topic: 科学家称大象平均每天仅睡两小时 三四天才睡一次 (Read 189 times)
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科学家称大象平均每天仅睡两小时 三四天才睡一次
March 06, 2017, 12:07:24 PM
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据俄新社3月2日报道,科学家在美国《科学公共图书馆·综合》期刊上发表文章称,这种大型哺乳动物平均每天只睡两小时,而且大脑不会因为睡眠不足而受影响。
南非金山大学的保罗·曼格表示,“人工饲养的大象每天睡约4小时-6小时,但我们对自然条件下大象的睡眠进行了跟踪。结果表明,野生大象平均每天就睡两小时,这创下了哺乳动物的最少记录,这很可能与其庞大的体型有关,此外大象似乎3天-4天才睡一次”。
报道称,真正意义的睡眠过去被认为是哺乳动物和鸟类的特性,其具有不同的阶段。处于快波睡眠期的人或动物会将前一天发生的事件在记忆中“过一遍”,并且会做梦。在慢波睡眠期身体的各种感觉功能减退,骨骼肌反射活动和肌紧张减退、自主神经功能普遍下降。早前科学家发现,爬行动物也有这样的睡眠特点,令生物学家对快波睡眠是哺乳动物动物和鸟类具有更高智慧的特征的观点产生质疑。
另一个与睡眠有关的有趣规律是,睡眠取决于动物体型,体型越小的动物睡眠时间越长,反之则越短。这一规律也有例外,比如“永远在睡觉的”树懒和“永远醒着的”信天翁,不过大部分哺乳动物和鸟类都符合这个自然法则。
曼格表示,由于这个原因,大象的睡眠早就引起了科学家的争论。对圈养大象的观察表明,大象睡得意外的多,比理论上多数倍。曼格和他的同事推测,在野外环境中这一数据可能差别很大。
为证明这个假设,他们前往生活着非洲大象的博茨瓦纳保护区进行考察,找到了几只大象并在大象的颈和鼻上安装了运动传感器与GPS接收器。数周后动物学家取下了传感器并揭开了关于大象生活的大量有趣新事实。首先便是,大象确实比所有哺乳动物睡得少。被科学家追踪研究的所有大象一天的睡眠时间都是两小时左右,经常两昼夜不睡觉,如果它们受到猛兽或偷猎者的惊扰。
而且曼格和他的同事证实,大象可以站着睡,也可以倒在地上睡。这点科学家争论已久,根据的是对动物园大象的观察数据。大象的入睡时间非常固定——在离日出前很久的凌晨。曼格认为,这和日夜周期无关,而与空气温度、湿度及其他自然特点有关。
他表示,大象如此短暂的睡眠并据推测缺少快波睡眠,令其非常具有研究价值。大象的例子将令生物学家了解,机体如何成功克服缺乏睡眠的负面后果,或许部分结论有助于科学家找到失眠的根源并搞明白如何克服它。
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