Is the Shark Just Drifting, or Does It Take a Quick Nap?

• 作者: Erich K. Ritter
• 来源期刊: 动物科学期刊(英文)
• 学科: 地球科学
• 关键词: DRIFTING MELATONIN PINEAL GLAND SHARK Sleep
• 年，卷（期）: 2020,（1）
• 页码范围: 40-47
• 页数: 8页
• 分类号: P73

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.