阴影反应 Shadow reaction,skioptic rea- ction
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阴影反应 Shadow reaction, skioptic rea- ction 指多数动物于光度激减时所表现的运动反应。所取的运动形式有停止、后退、收缩等,可解释为因大敌当前,有逃避动作之意,管栖多毛类身体向管中退缩,双壳贝类的闭壳反应等都是这方面的例子;但水螅的阴影反应则是集向于明处的趋光性原因。由此看来,阴影反应不外是低度的反光调转运动。( Klinoki- nesis).
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