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Vocal individuality cues in the African penguin (Spheniscus demersus): a source-filter theory approach

机译:非洲企鹅(Spheniscus demersus)中的声音个性提示:一种源过滤理论方法

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摘要

The African penguin is a nesting seabird endemic to southern Africa. In penguins of the genus Spheniscus vocalisations are important for social recognition. However, it is not clear which acoustic features of calls can encode individual identity information. We recorded contact calls and ecstatic display songs of 12 adult birds from a captive colony. For each vocalisation, we measured 31 spectral and temporal acoustic parameters related to both source and filter components of calls. For each parameter, we calculated the Potential of Individual Coding (PIC). The acoustic parameters showing PIC ≥ 1.1 were used to perform a stepwise cross-validated discriminant function analysis (DFA). The DFA correctly classified 66.1% of the contact calls and 62.5% of display songs to the correct individual. The DFA also resulted in the further selection of 10 acoustic features for contact calls and 9 for display songs that were important for vocal individuality. Our results suggest that studying the anatomical constraints that influence nesting penguin vocalisations from a source-filter perspective, can lead to a much better understanding of the acoustic cues of individuality contained in their calls. This approach could be further extended to study and understand vocal communication in other bird species.
机译:非洲企鹅是南部非洲特有的筑巢海鸟。在企鹅属中,发声对于社会认可很重要。但是,尚不清楚呼叫的哪些声学特征可以编码个人身份信息。我们录制了来自圈养殖民地的12只成年鸟类的联系电话和狂喜的表演歌曲。对于每次发声,我们测量了31个与呼叫的源和滤波器成分相关的频谱和时间声学参数。对于每个参数,我们计算了单个编码的潜能(PIC)。显示PIC≥1.1的声学参数用于执行逐步交叉验证的判别函数分析(DFA)。 DFA将正确的个人正确分类为66.1%的联系电话和62.5%的显示歌曲。 DFA还导致进一步选择了10个用于通话的声学功能,另外9个用于显示对声音个性非常重要的歌曲。我们的结果表明,从源过滤器的角度研究影响嵌套企鹅发声的解剖学约束条件,可以使人们更好地理解其呼叫中所包含的个性化声音提示。该方法可以进一步扩展为研究和理解其他鸟类物种的声音交流。

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