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Behavioural response to songs between genetically diverged allopatric populations of Darwin's small tree finch in the Galápagos.
Journal of Evolutionary Biology ( IF 2.1 ) Pub Date : 2021-03-13 , DOI: 10.1111/jeb.13783
Diane Colombelli-Négrel 1 , Sonia Kleindorfer 1, 2
Affiliation  

Empirical data that identify contemporary mechanisms of divergence shed light on how species could multiply. In this study, we measured population genetic structure, song syllable diversity and response to simulated intruder song in Darwin's small tree finch (Camarhynchus parvulus) on Santa Cruz and Floreana Islands, Galápagos archipelago. Our aim was to test whether the magnitude of contemporary behavioural response in resident birds was consistent with patterns of genetic or cultural differences between populations. We analysed genetic structure and the occurrence of song syllable types, and experimentally measured the response of resident birds to intruder bird song from different geographical origin (i.e., island) or syllable type. We discovered a weak signal of population genetic structure between Santa Cruz and Floreana Islands. Although some song syllables occurred on both islands, others were unique to each island; Santa Cruz Island males used more unique syllables than Floreana Island males. Both Santa Cruz and Floreana resident males discriminated their response towards a simulated intruder song based on the geographical origin of the intruder song, but not on the syllable type sung by the intruder. We conclude that the populations are diverging in genetic and cultural traits and identified a signal of contemporary behavioural response that could maintain divergence upon secondary contact.

中文翻译:

对加拉帕戈斯群岛达尔文小树雀的遗传异源异种种群之间的歌曲的行为响应。

识别当代分歧机制的经验数据为物种如何繁衍提供了线索。在这项研究中,我们测量了加拉帕戈斯群岛圣克鲁斯和弗洛里亚纳群岛达尔文小树雀(Camarhynchus parvulus)的种群遗传结构,歌曲音节多样性和对模拟入侵者歌曲的响应。我们的目的是检验居住鸟类中当代行为反应的强度是否与种群之间遗传或文化差异的模式一致。我们分析了遗传结构和歌曲音节类型的发生,并通过实验测量了居住鸟类对来自不同地理起源(即岛屿)或音节类型的入侵鸟类歌曲的反应。我们发现了圣克鲁斯和弗洛里亚纳群岛之间的种群遗传结构微弱信号。尽管在两个岛上都出现了一些歌曲音节,但其他每个岛都独有。圣克鲁斯岛的男性比弗洛雷亚纳岛的男性使用更多独特的音节。圣克鲁斯(Santa Cruz)和弗洛瑞亚娜(Floreana)居民男性均基于入侵者歌曲的地理来源(而不是入侵者演唱的音节类型)来区分他们对模拟入侵者歌曲的反应。我们得出的结论是,人群的遗传和文化特征正在发生分化,并确定了当代行为反应的信号,这种信号可能在二次接触后保持分化。圣克鲁斯(Santa Cruz)和弗洛瑞亚娜(Floreana)居民男性均基于入侵者歌曲的地理起源(而不是入侵者演唱的音节类型)来区分他们对模拟入侵者歌曲的反应。我们得出的结论是,人群的遗传和文化特征正在发生分化,并确定了当代行为反应的信号,这种信号可能在二次接触后保持分化。圣克鲁斯(Santa Cruz)和弗洛瑞亚娜(Floreana)居民男性均基于入侵者歌曲的地理来源(而不是入侵者演唱的音节类型)来区分他们对模拟入侵者歌曲的反应。我们得出的结论是,人群的遗传和文化特征正在发生分化,并确定了当代行为反应的信号,这种信号可能在二次接触后保持分化。
更新日期:2021-03-13
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