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首页> 外文期刊>Ethology >No Correlation Between Three Selected Trade-Offs in Birdsong Performance and Male Quality for a Species With Song Repertoires
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No Correlation Between Three Selected Trade-Offs in Birdsong Performance and Male Quality for a Species With Song Repertoires

机译：带有曲目库的物种在鸟类歌曲性能和雄性质量之间的三个权衡取舍之间没有相关性

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Demanding performance of vocal signals, such as birdsong, may be evaluated by trade-offs among acoustic traits. If individuals differ in their ability to sustain physiologically demanding singing, then aspects of song performance resulting from such trade-offs could signal individual quality. Song performance can also differ among song types, and it is not known whether this influences the assessment of individual quality. We asked whether three trade-off-based measures of song performance indicate male age or aspects of condition (body condition, hematocrit and ectoparasite load) in the dark-eyed junco (Junco hyemalis), a species with small repertoires. Across a sample of over 100 males, no measure of song performance was related to male age or condition, nor did song performance improve with age for those males recorded in consecutive years. In all cases, the variation in song performance explained by these predictors was small (<4%). Instead, the more song types we recorded from a male, the more likely we were to record high-performance songs, and this sampling effect was stronger than putative correlations with male quality. These results complement a previous study on this population showing that most variation in performance is found among song types rather than among males. Collectively, the lack of association between trade-off-based aspects of song performance and male age or condition, plus variation among song types that interferes with rapid assessment of a male's best performance, indicate that these aspects of song performance do not allow a good assessment of male quality in juncos, and perhaps more generally in species with song repertoires.
机译：诸如鸟鸣之类的声音信号的苛刻性能可以通过声学特征之间的权衡来评估。如果个体维持生理上要求的歌唱的能力不同，则在这种权衡下产生的歌曲表现的各个方面可能表明个体的素质。歌曲的表现在不同类型的歌曲中也可能有所不同，尚不清楚这是否会影响个人音质的评估。我们询问三种基于权衡的歌曲表现指标是否表明男性年龄或在具有较小保留曲目的黑眼（Junco hyemalis）中的状况（身体状况，血细胞比容和体外寄生虫负荷）方面。在超过100位男性的样本中，歌曲表现的任何指标都与男性年龄或状况无关，连续几年记录的男性的歌曲表现也不随年龄而提高。在所有情况下，这些预测变量所解释的歌曲性能差异都很小（<4％）。相反，我们从男性录制的歌曲类型越多，我们录制高性能歌曲的可能性就越大，并且这种采样效果比与男性质量的推定相关性强。这些结果补充了先前对该人群的研究，该研究表明，在歌曲类型中而不是男性中，表现的变化最大。总的来说，基于折衷的歌曲表现与男性年龄或状况之间缺乏关联，再加上歌曲类型之间的差异会干扰对男性最佳表现的快速评估，这表明，歌曲表现的这些方面都不允许良好的表现。评估juncos中的雄性质量，也许更普遍地评估具有歌曲曲目的物种。

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