ABSTRACT Territorial male birds of many north temperate species sing prolifically before sunrise in a behaviour known as ‘dawn song,’ after which males sing at lower rates, use different song types, or cease singing altogether. From May to July 2017 in southern Indiana, we recorded 100 dawn song performances from 12 paired male Cerulean Warblers (Setophaga cerulea) and we quantified the relative influences of social (breeding stage of the focal pair) and abiotic factors (Julian date and weather) on six characteristics of dawn song. We found that dawn song was influenced by both biotic and abiotic factors, but weather had the most model support. Males were more likely to sing dawn song early in the season, and most males nesting late in the season ceased dawn song altogether. Dawn song start times (in relation to sunrise) varied little over the season, but males ended dawn song earlier, and sang at lower peak rates, as the season progressed. Additionally, males initiated and ended dawn song later on windy and rainy mornings. Multiple factors apparently influence dawn singing behaviour in paired male Cerulean Warblers, yet weather may have a greater effect on dawn song than do Julian date or social behaviour.

中文翻译：

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社会因素是否可以解释成对雄性蔚蓝莺（Setophaga cerulea）的黎明歌曲特征的季节性变化？

摘要 许多北温带物种的领地雄鸟在日出前以一种被称为“黎明之歌”的行为大量唱歌，之后雄鸟以较低的频率唱歌，使用不同的歌曲类型，或者完全停止唱歌。2017 年 5 月至 7 月在印第安纳州南部，我们记录了 12 对雄性蔚蓝莺（Setophaga cerulea）的 100 首黎明歌曲表演，并量化了社会（焦点对的繁殖阶段）和非生物因素（儒略日期和天气）的相对影响论黎明之歌的六大特点。我们发现黎明之歌受到生物和非生物因素的影响，但天气有最多的模型支持。雄性在季节早期更有可能唱黎明之歌，大多数在季节后期筑巢的雄性完全停止了黎明之歌。黎明歌曲开始时间（与日出相关）在整个季节变化不大，但随着季节的进行，雄性会更早结束黎明歌曲，并且以较低的峰值频率唱歌。此外，雄性在刮风和下雨的早晨开始和结束黎明歌曲。多种因素显然会影响成对的雄性蔚蓝莺的黎明歌唱行为，但与朱利安约会或社会行为相比，天气对黎明歌唱的影响可能更大。