The diversity and the motor performance of birdsongs can both be sexually selected. In wood warblers, most species with high motor performance sing a greater proportion of trills, presumably to advertise performance, and thus have lower syllable diversity. We tested if this trade‐off between motor performance and syllable diversity extends to canaries, goldfinches and allies, a clade with much longer and more varied songs. We assembled a molecular phylogeny and inferred song motor performance based on the speed of frequency modulation either in trills or in within‐song intervals. The two metrics of performance were positively, but only mildly, related across species. While performance evaluated in intervals had high phylogenetic signal, performance evaluated in trills changed independently of phylogeny and was constrained by body size. Species in densely vegetated habitats sang fewer trills, but did not differ in motor performance. Contrary to wood warblers, song motor performance did not predict the proportion of trilled syllables nor within‐song syllable diversity, perhaps because large differences in the song duration of canaries, goldfinches and allies prevent trills from severely compromising syllable diversity. Opposed results in wood warblers and in these finches indicate the existence of clade‐specific trade‐offs in the evolution of birdsong.

中文翻译：

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金丝雀、金翅雀和盟友的歌曲多样性和歌曲运动表现的独立进化表明鸟鸣中的特定进化枝权衡

鸟鸣的多样性和运动表现都可以通过性选择。在木莺中，大多数具有高运动性能的物种会发出更大比例的颤音，大概是为了宣传性能，因此具有较低的音节多样性。我们测试了这种运动表现和音节多样性之间的权衡是否会扩展到金丝雀、金翅雀和盟友，这是一个歌曲更长、更多样化的分支。我们组装了分子系统发育并根据颤音或歌曲间隔中的频率调制速度推断歌曲运动性能。这两个性能指标在物种之间呈正相关，但只是轻微相关。虽然在间隔中评估的性能具有较高的系统发育信号，但在颤音中评估的性能独立于系统发育而变化，并受体型的限制。植被茂密栖息地的物种发出的颤音较少，但运动表现没有差异。与木莺相反，歌曲运动表现不能预测颤音音节的比例，也不能预测歌曲内音节的多样性，这可能是因为金丝雀、金翅雀和盟友的歌唱持续时间的巨大差异阻止了颤音严重损害音节多样性。在林莺和这些雀科中的相反结果表明，在鸟鸣的进化中存在特定于进化枝的权衡。金翅雀和盟友可以防止颤音严重损害音节多样性。在林莺和这些雀科中的相反结果表明，在鸟鸣的进化中存在特定于进化枝的权衡。金翅雀和盟友可以防止颤音严重损害音节多样性。在林莺和这些雀科中的相反结果表明，在鸟鸣的进化中存在特定于进化枝的权衡。