Is the Shark Just Drifting, or Does It Take a Quick Nap?
Is the Shark Just Drifting, or Does It Take a Quick Nap?作者机构：Department of Mathematics and Statistics University of West Florida Pensacola FL USA Shark Research Institute Princeton NJ USA
出 版 物：《Open Journal of Animal Sciences》 (动物科学期刊（英文）)
年 卷 期：2020年第10卷第1期
页 面：40-47页
主 题：Drifting Melatonin Pineal Gland Shark Sleep
摘 要：It is unknown if resting sharks can sleep, which is also true for gliding ones. Here, a videotaped bull shark is presented that drifted in an uncontrolled manner for 120 seconds while sinking with 0.1 m/second. Several aspects are discussed to determine if the shown behavior reflects the commonly accepted definition of sleep. Additionally, the idea is also discussed if this state might reflect a “quiet waking state instead of where the shark still maintained some vigilance despite its general appearance.
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