...This experiment showed that the direction of migration is genetically determined. G. Kramer of Germany placed starlings in a circular cage with evenly spaced windows and discovered that when light was let in through the windows, they showed a certain direction to the light (orientation), but on cloudy days they showed no direction at all. GVT Matthews of England further developed the idea from this experiment and proposed the theory that birds find their direction by the solar arc, in other words, that they have a solar compass. ... *Some of the terminology that mentions "Kramer, G." is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…この実験から渡りの方向は遺伝的に定められていることがわかった。ドイツのクラマーG.Kramerはホシムクドリを等間隔に窓をつけた円形のかごに入れ,窓から光を入れたところ光線に対してある一定の方向を示し(定位),曇天ではまったく方向性を示さないことを発見した。イギリスのマシューズG.V.T.Matthewsはさらにこの実験から考えを発展させて太陽弧によって鳥が方向性を見いだしている,つまり鳥が太陽コンパスをもっているという説を出した。… ※「Kramer,G.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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