偏極化された光線が,移動する歌う鳥のコンパス校正の基礎となっている
Rachel Muheim1, John B Phillips, Susanne Akesson
1Department of Animal Ecology, Lund University, Ecology Building, SE-223 62 Lund, Sweden. rmuheim@vt.edu
Science (New York, N.Y.)
|August 12, 2006
まとめ
移動する歌う鳥は,日出と日没時に地平線近くの偏光を用いて磁気コンパスを校正する. このスカイライトの極化により,鳥の移住の正確なナビゲーションのための地理的参照が提供されます.
科学分野:
- 鳥類学 鳥類学とは,鳥類学である.
- アニマルナビゲーション 動物ナビゲーション
- 地質物理学 地質物理学とは地質物理学です.
背景:
- 移動する歌う鳥は,地磁場,天体,偏光など,複数のシグナルに頼って,方向性を決めます.
- 鳥の正確な移住には,これらの様々な感覚システムの正確な校正が,ナビゲーションの誤りを防ぐために統一された基準枠に要求されます.
研究 の 目的:
- 移動するサバンナ・スパバードが磁気コンパスを調整する方法を調査するためです.
- 鳥類のコンパスシステムの再校正における偏光信号の役割を決定する.
主な方法:
- 日の出と日の暮れの間に移動するサバンナ・スパーウィンの観察研究.
- 空の地平線地域からの偏光光パターンの使用の分析.
主要な成果:
- 移動するサバンナ・スパーウィンは,地平線近くの偏光パターンを利用して,磁気コンパスを再調整します.
- この再校正は,特に日の出と日の暮れの間に行われます.
結論:
- スカイライトの極化パターンは,絶対的な地理的方向性システムを導出するための重要な参照として機能します.
- このシステムは,移動する歌う鳥が使用するすべてのコンパスシステムの主要な校正基準となるように提案されています.
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