When birds sing at the same pitch, they avoid singing at the same time
When birds sing at the same pitch, they avoid singing at the same time
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当鸟儿以相同的音调唱歌时，它们会避免同时唱歌
作者：
Chronister, Lauren M.;Rhinehart, Tessa A.;Kitzes, Justin
鸟类合唱必须与干扰彼此歌唱的可能性作斗争，但由于信号分割，并不是所有物种都会以同样的程度相互干扰。一些证据表明，只有在鸣叫的频率存在重叠的情况下，鸣禽才能避免时间重叠，但这种行为随着频率重叠程度的不同而变化的程度尚不清楚。我们通过测试北美东部温带鸟类群落中频率重叠和时间回避之间的线性相关性，研究了随着频率重叠的增加，鸟类将越来越多地避免异种时间重叠的假设。我们发现，在整个群落中，在15个常见的个体物种中，有12个物种之间存在显著的相关性，这支持了我们的假设，并增加了越来越多的证据，表明鸟类根据频率重叠调整鸣叫的时间。
Birds singing in choruses must contend with the possibility of interfering with each other's songs, but not all species will interfere with each other to the same extent due to signal partitioning. Some evidence suggests that singing birds will avoid temporal overlap only in cases where there is overlap in the frequencies their songs occupy, but the extent to which this behaviour varies according to level of frequency overlap is not yet well understood. We investigated the hypothesis that birds will increasingly avoid heterospecific temporal overlap as their frequency overlap increases by testing for a linear correlation between frequency overlap and temporal avoidance across a community of temperate eastern North American birds. We found that there was a significant correlation across the whole community and within 12 of 15 commonly occurring individual species, which supports our hypothesis and adds to the growing body of evidence that birds adjust the timing of their songs in response to frequency overlap.