The treefrog Pithecopus nordestinus emits aggressive calls during agonistic interactions between males, but how these vocalizations vary between contexts with different levels of aggression remains unknown. Herein, we compared the acoustic parameters of aggressive calls emitted during physical disputes and out of fight contexts. The aggressive calls emitted during physical clashes (Fighting Calls) presented a repetition rate, duration and number of pulses significantly higher than those emitted out of fight contexts. Our results expand the knowledge about acoustic repertoire of Phyllomedusidae treefrogs and contribute to the understanding of the effects of social tension on the vocal behavior of anurans.

树蛙Pithecopus nordestinus在雄性之间的对抗性互动中会发出攻击性的叫声，但这些发声在具有不同攻击性的环境之间如何变化仍然未知。在这里，我们比较了在身体纠纷和非战斗环境中发出的攻击性呼叫的声学参数。身体冲突期间发出的攻击性呼叫（战斗呼叫）的重复率、持续时间和脉冲数量明显高于非战斗环境发出的脉冲。我们的研究结果扩展了关于 Phyllomedusidae 树蛙声学曲目的知识，并有助于理解社会紧张对无尾蚴发声行为的影响。