共鳴効果は,鳥類の磁気コンパスの根対メカニズムを示唆しています
Thorsten Ritz1, Peter Thalau, John B Phillips
1Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA. tritz@uci.edu
Nature
|May 14, 2004
まとめ
鳥類 鳥類 鳥類 移動鳥類 移動鳥類
科学分野:
- 鳥類学と生物物理学について
背景:
- 移動する鳥は,地球の地磁場を使って航海します.
- 鳥類の磁気コンパスには2つの仮説がある:磁石ベースの,または化学反応.
- ラジカルペアメカニズムは,化学反応経路の主要な仮説である.
研究 の 目的:
- 振動する磁場が鳥の磁気指向に与える影響を調査する.
- 鳥類の磁気コンパスの磁石と根幹対メカニズム仮説を区別する.
主な方法:
- ロビンは,地磁場に加えて,振動する磁場 (ブロードバンドおよび単一周波数) にさらされました.
- オリエンテーションの振る舞いは,振動場と地磁場との間の異なる角度で評価されました.
- 特定の周波数 (7MHz) とフィールドアラインメントをテストした.
主要な成果:
- 振動する磁場は,移動ロビンの磁気指向の行動を混乱させた.
- ブロードバンド (0.1~10MHz) と7MHzの単周波数フィールドの両方に障害が発生しました.
- オリエンテーションは,振動場が地磁場に平行であったときに維持されたが,24度および48度の角度で破壊された.
結論:
- この結果は,鳥類の磁気コンパスにおける根対メカニズムを支持している.
- 観測された共振効果は,根幹のペアにおけるシングレット・トリプレット・トランジションと一致する.
- 鳥の磁場方向性は,特定の周波数や磁場の位置に敏感である.
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