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Bioacoustic variation in Wren Troglodytes troglodytes populations on Welsh islands
Bird Study ( IF 0.7 ) Pub Date : 2020-04-02 , DOI: 10.1080/00063657.2020.1785390
Aurora Gonzalo-Tarodo 1 , Richard J. Facey 2 , Jim O. Vafidis 1
Affiliation  

ABSTRACT Capsule: Duration and peak frequency of Wren Troglodytes troglodytes songs differ between Welsh islands (Skokholm, Flat Holm, and Sully Island) and a mainland site, suggesting random or cultural divergence. Aims: The study tests for differences in bioacoustic traits in Wren song between four breeding sites. Methods: Songs from breeding male Wrens were recorded from three Welsh islands and a representative location on the local mainland. Each sonogram was measured for six variables from the whole song and two distinct phrases from the beginning and middle. The variables were measured manually using an open source acoustic tool and compared between sites using generalized linear mixed-effects models. Results: There was significant variation in song variables between island sites and the mainland. Skokholm Wren songs were significantly longer in duration than all other sites by up to 66%. Peak frequency was significantly different across all sites with Sully Island having the highest peak frequency and Skokholm the lowest. Conclusion: The differences in song duration and frequency do not directly suggest a trend associated with selective pressures such as habitat or noise, but instead may be explained by non-selective drivers such as cultural drift or local dialect formation.

中文翻译:

威尔士岛屿 Wren Troglodytes troglodytes 种群的生物声学变异

摘要胶囊:Wren Troglodytes troglodytes 歌曲的持续时间和峰值频率在威尔士岛屿(Skokholm、Flat Holm 和 Sully Island)和大陆站点之间不同,表明随机或文化差异。目的:该研究测试了四个繁殖地点之间 Wren Song 生物声学特征的差异。方法:从威尔士的三个岛屿和当地大陆的一个代表性地点记录繁殖雄性鹪鹩的歌曲。每个声波图都针对整首歌曲中的六个变量以及开头和中间的两个不同短语进行了测量。这些变量是使用开源声学工具手动测量的,并使用广义线性混合效应模型在站点之间进行比较。结果:岛屿站点和大陆之间的歌曲变量存在显着差异。Skokholm Wren 歌曲的持续时间比所有其他网站长 66%。所有站点的峰值频率都有显着差异,其中 Sully Island 的峰值频率最高,Skokholm 的峰值频率最低。结论:歌曲持续时间和频率的差异并不直接表明与栖息地或噪音等选择压力相关的趋势,而是可能由非选择性驱动因素解释,如文化漂移或当地方言形成。
更新日期:2020-04-02
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