Vocal behavior of the Undulated Tinamou (Crypturellus undulatus) over an annual cycle in the Brazilian Pantanal: new ecological information

Tinamous (Tinamidae) are a group of Neotropical birds for which little information is available. The Undulated Tinamou (Crypturellus undulatus) is one of the most widespread species but also declining. Due to its secretive habits, ecological knowledge regarding the species relies on few anecdotal descriptions. We used automated recorders to monitor the vocal activity of the species over an annual cycle at four sites in the Brazilian Pantanal. We provide a description and analyze the diel and seasonal patterns of the calling activity in this species and provide new ecological information. The daily cycle showed two significant peaks in calling activity during the early morning and late afternoon, in agreement with the vocal behavior common among tinamous. The species was vocally active throughout the year, but it was significantly higher during September–October and March. This suggests that the breeding period of the Undulated Tinamou in the Brazilian Pantanal extends from September to ...䳍类（Tinamidae）是一类新热带鸟类，目前关于该类群的研究资料相对匮乏。波纹䳍（Crypturellus undulatus）是该类群中分布最广的物种之一，但其种群数量正呈下降趋势。由于该物种生性隐秘，当前关于其的生态学认知仅依托少量轶事性描述。本研究借助自动录音记录仪，在巴西潘塔纳尔湿地的四个监测点开展了为期一整年的该物种鸣声活动监测。本研究对该物种的鸣声行为进行了描述，分析了其鸣声活动的昼夜与季节节律，并补充了全新的生态学信息。昼夜节律分析显示，该物种的鸣声活动存在两个显著峰值，分别出现在清晨与傍晚时段，这与已知䳍类鸟类的典型鸣声行为模式相符。该物种全年均存在鸣声活动，但在9-10月与3月期间，其鸣声频次显著升高。这表明巴西潘塔纳尔湿地内波纹䳍的繁殖期大致为9月至……