体征对灰眉岩鹀鸣唱特征的影响

声信号是鸟类交流的重要方式。鸟类的鸣声特征受到生境的塑造和性选择,也受到发声器官的影响,如种间的比较研究发现,体重大的鸟类鸣声频率低,喙短的鸟类鸣声频宽大。在种内是否也存在类似的规律,目前的结论还不一致。2012年6月,在北京小龙门地区(40°00'N,115°26'E)测量了17只灰眉岩鹀(Emberiza godlewskii)的形态参数以及鸣声的频率特征,未发现体重或喙长与鸣声的最高频率、最低频率、峰频或频宽存在显著的相关性。本研究的结果支持在小型雀形目鸟类中,体型对繁殖期鸣唱频率特征的影响不显著。

Lack of body size and beak length constraints on the song of Emberiza godlewskii

Acoustic signal is important for bird communication. Differences in vocal characteristics are usually explained by habitat-dependent selection on signal transmission and/or sexual selection by female preference. The organ to produce signals can also be influence signal features. For example, the negative relationship between frequency and body size; negative relationship between frequency bandwidth and beak length. These negative relationships usually stand among species, but it is unclear if such relationships exist within species. We studied the sound from 17 individuals of Emberiza godlewskii, recorded in Beijing Xiaolongmen forest Park during the 2012 breeding season. We measured the maximum frequency, minimum frequency, peak frequency, frequency range, and found that none of these frequency traits was related to body size, or beak length. Possible reasons for these results are the vocal learning, female preferences, and small range of variation within species. Besides, we found peak frequency (6.31 kHz) is widely deviate from value (3.46 kHz) predicted for by empirical formula, which imply other selection than morphological measurement work on the vocal of Emberiza godlewskii.