Increased urbanization leads to the modification of animal behavior, including the start of the dawn chorus in birds. The beginning of the dawn chorus has been studied in relation to the level of urban noise and nocturnal artificial light in oscine birds, with few studies in suboscines. We evaluated a possible relationship between the start of the dawn chorus and different urbanization levels in a suboscine, the vermilion flycatcher (Pyrocephalus rubinus), in seven locations in the city of Armenia (Colombia). We categorized the urbanization level in each location according to its percentage of built structures, into low and high levels. Observations were made during pre-dawn, starting at 00:00 hr. During each visit we recorded maximum noise levels, artificial light at night (ALAN) and time of first song. Males inhabiting the high urbanization locations started the dawn chorus on average 101 min before sunrise, while males in low urbanization levels did so on average 38 min before. Neither noise level nor ALAN explained this difference. We discuss that, for suboscines, another urban-related factor (ambient temperature) may be a key factor driving the onset of dawn chorus.

城市化的增加导致动物行为的改变，包括鸟类黎明合唱的开始。已经研究了黎明合唱的开始与城市噪音和夜间人造光在 oscine 鸟类中的关系，而对 suboscines 的研究很少。我们评估了黎明合唱团的开始与 suboscine，朱红色捕蝇器（Pyrocephalus rubinus ）中不同城市化水平之间的可能关系），在亚美尼亚（哥伦比亚）市的七个地点。我们根据建筑结构的百分比将每个地点的城市化水平分为低水平和高水平。观察是在黎明前进行的，从 00:00 开始。在每次访问期间，我们记录了最大噪音水平、夜间人造光 (ALAN) 和第一首歌的时间。居住在高城市化地区的男性平均在日出前 101 分钟开始黎明合唱，而低城市化水平的男性平均在日出前 38 分钟开始。噪音水平和 ALAN 都没有解释这种差异。我们讨论了，对于 suboscines，另一个与城市相关的因素（环境温度）可能是推动黎明合唱开始的关键因素。