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Processes underlying complex patterns of song trait evolution in a Setophaga hybrid zone
Ecology and Evolution ( IF 2.6 ) Pub Date : 2021-05-01 , DOI: 10.1002/ece3.7559
Jay Love 1 , Franz Goller 1, 2
Affiliation  

During secondary contact between two species when hybrids are less fit than parents, mating signals are expected to diverge, while aggressive signals are expected to converge. If a single signal trait is used in both mating and aggression, then the dynamics between these two forces could influence the evolutionary trajectory of that trait. We studied such a situation in an avian hybrid zone between two Setophaga species, where birdsong is used in both mate attraction and territory defense. We hypothesized that song modules of the two species will show separate and distinct geographic patterns due to the influence of selective pressures for effective territorial aggression and for effective mate attraction. We conducted geographic cline analyses and playback experiments across this hybrid zone. We found an unexpected geographic pattern of asymmetric introgression of song rhythm, which may be explained by results of the playback experiments that suggest that differences in song rhythm serve a greater role in mate attraction than in territory defense. In contrast, differences in syllable morphology show little evidence of importance in mate attraction or territorial defense. Song features converge in the hybrid zone, yet patterns of trait change suggest that the song production modules may vary in their modes of development and inheritance. Syringeal motor gesturing, which gives rise to syllable morphology, shows a nonclinal mosaic pattern, suggesting that this trait may be predominantly learned. In contrast, respiratory patterning, which forms song rhythm, shows a clinal geographic transition, suggesting that this trait could be more innate. The results indicate that opposing forces act independently on song via distinct modules of the song production mechanism, driving complex patterns of song trait evolution.

中文翻译:

Setophaga 杂种区歌曲性状进化复杂模式的过程

当杂种比亲本更不适合时,在两个物种之间的二次接触期间,交配信号预计会发散,而攻击性信号预计会收敛。如果在交配和攻击中都使用单一信号特征,那么这两种力量之间的动态可能会影响该特征的进化轨迹。我们在两个Setophaga之间的鸟类杂交区研究了这种情况物种,鸟鸣用于吸引配偶和领土防御。我们假设,由于有效领土侵略和有效配偶吸引的选择压力的影响,这两个物种的歌曲模块将显示出独立且不同的地理模式。我们在这个混合区进行了地理克隆分析和回放实验。我们发现了一种意想不到的歌曲节奏不对称渗入的地理模式,这可以通过播放实验的结果来解释,这表明歌曲节奏的差异在吸引配偶方面的作用比在领土防御中的作用更大。相比之下,音节形态的差异几乎没有证据表明在配偶吸引或领土防御方面的重要性。歌曲特征汇聚于混合区,然而,特征变化的模式表明歌曲制作模块的发展和继承模式可能有所不同。产生音节形态的注射器运动手势显示出非临床镶嵌模式,表明这种特征可能主要是后天习得的。相比之下,形成歌曲节奏的呼吸模式显示出临床地理过渡,表明这种特征可能更加先天。结果表明,对立的力量通过歌曲产生机制的不同模块独立作用于歌曲,驱动歌曲性状进化的复杂模式。相比之下,形成歌曲节奏的呼吸模式显示出临床地理过渡,表明这种特征可能更加先天。结果表明,对立的力量通过歌曲产生机制的不同模块独立作用于歌曲,驱动歌曲性状进化的复杂模式。相比之下,形成歌曲节奏的呼吸模式显示出临床地理过渡,表明这种特征可能更加先天。结果表明,对立的力量通过歌曲产生机制的不同模块独立作用于歌曲,驱动歌曲性状进化的复杂模式。
更新日期:2021-06-22
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