Grasshopper mice employ distinct vocal production mechanisms in different social contexts
Grasshopper mice employ distinct vocal production mechanisms in different social contexts
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DOI：
10.1098/rspb.2017.1158
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发表时间：
2017-07-26
影响因子：
4.7
通讯作者：
Riede, Tobias
中科院分区：
文献类型：
--
作者：
Pasch, Bret;Tokuda, Isao T.;Riede, Tobias
发声器官形态和运动控制的功能改变促进了声信号多样性的进化。尽管许多啮齿动物在各种社会环境中产生发声，但很少有研究探索其潜在的产生机制。在这里，我们描述了蝗虫小鼠（Onychomys属）产生的听觉和超声波发声（USVs）的机制。蚱蜢是沙漠中的掠食性啮齿动物，它们既能发出响亮的远距离广告叫声，也能在近距离交配时发出usv。通过在正常空气和空气中进行活体记录、喉道和声道形态学调查以及生物力学建模，我们发现蚱蜢小鼠采用两种不同的发声机制。在heliox中，长途呼叫的高谐波振幅的变化表明气流诱导的组织振动机制，而usv的基频变化支持哨声机制。声膜和薄固有层分别通过提高声门效率和允许高频率来帮助长距离通话。此外，将基本频率调谐到钟形声道的第二共振会增加呼叫幅度。我们的研究结果表明，蚱蜢可以动态调整运动控制以适应社会环境，并具有新的形态适应，促进远距离交流。
Functional changes in vocal organ morphology and motor control facilitate the evolution of acoustic signal diversity. Although many rodents produce vocalizations in a variety of social contexts, few studies have explored the underlying production mechanisms. Here, we describe mechanisms of audible and ultrasonic vocalizations (USVs) produced by grasshopper mice (genus Onychomys). Grasshopper mice are predatory rodents of the desert that produce both loud, long-distance advertisement calls and USVs in close-distance mating contexts. Using live-animal recording in normal air and heliox, laryngeal and vocal tract morphological investigations, and biomechanical modelling, we found that grasshopper mice employ two distinct vocal production mechanisms. In heliox, changes in higher-harmonic amplitudes of long-distance calls indicate an airflow-induced tissue vibration mechanism, whereas changes in fundamental frequency of USVs support a whistle mechanism. Vocal membranes and a thin lamina propria aid in the production of long-distance calls by increasing glottal efficiency and permitting high frequencies, respectively. In addition, tuning of fundamental frequency to the second resonance of a bell-shaped vocal tract increases call amplitude. Our findings indicate that grasshopper mice can dynamically adjust motor control to suit the social context and have novel morphological adaptations that facilitate long-distance communication.