動物の行動: 鯨類の出生後の継続的な活動

Oleg Lyamin¹, Julia Pryaslova, Valentine Lance

¹University of California, Los Angeles & VA GLAHS, Sepulveda, North Hills, California 91343, USA.

Nature

|July 1, 2005

まとめ

新生鯨類は,殺人鯨やボトルノスのイルカのように,最初の1ヶ月はほとんど眠らないので,睡眠は発達と成人の生存に不可欠であるという仮定に異議を唱えます.

科学分野:

マリン・バイオロジーの海洋生物学
神経科学は神経科学である.
動物の行動動物の行動

背景:

哺乳類の新生児は,通常,睡眠量が多く,年齢とともに減少します.
睡眠不足は,成人の果実ハエとネズミに致命的であり,重要な機能を示唆しています.
鯨類の新生児は,以前は哺乳類の典型的な睡眠パターンに従っていると考えられていた.

研究の目的:

新生クジラとその母親の睡眠行動を調査するために.
鯨類の発達と生存に睡眠が不可欠かどうかを判断する.
鯨類における睡眠機能の潜在的な代替メカニズムを探求する.

主な方法:

殺人鯨とボトルネスイルカの母と新生児のペアの観察研究.
休息と睡眠の行動を含む,日々の活動パターンの監視.
産後数ヶ月の睡眠時間の長期的評価.

主要な成果:

鯨の新生児と母親は,産後最初の1ヶ月間,睡眠がほとんどなかった.
絶え間ない移動と障害物の回避が24時間観察されました.
睡眠時間は,数ヶ月間,徐々に増加し,正常な成人レベルまで,それを超えることなく増加しました.

結論:

睡眠は,以前考えられていたように,発達と成人の生命維持に普遍的に不可欠ではないかもしれません.
鯨類は,睡眠に起因する機能を果たすための代替メカニズムを持っているかもしれない.
発見は,哺乳類における睡眠の基本的な役割に関する確立された理論に異議を唱える.

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