Department of Integrative Biology and Physiology, University of California Los Angeles, Los Angeles, CA 90095-1606, USA.
Faculty of Science, University Brunei Darussalam, Tungku Link, Gadong BE1410, Brunei Darussalam.
Biol Lett. 2020 Jul;16(7):20200343. doi: 10.1098/rsbl.2020.0343. Epub 2020 Jul 1.
Despite the predominance of low-frequency hearing in anuran amphibians, a few frog species have evolved high-frequency communication within certain environmental contexts. is the most remarkable anuran with regard to upper frequency limits; it is the first frog species known to emit exclusively ultrasonic signals. Characteristics of the Distortion Product Otoacoustic Emissions from the amphibian papilla and the basilar papilla were analysed to gain insight into the structures responsible for high-frequency/ultrasound sensitivity. Our results confirm the matching of vocalization spectra and inner ear tuning in this species. Compared to most anurans, has a hyperextended hearing range spanning from audible to ultrasonic frequencies, far above the previously established 'spectral limits' for the amphibian ear. The exceptional high-frequency sensitivity in the inner ear of illustrates the remarkable plasticity of the auditory system and the extent to which evolution can modify a sensory system to adapt it to its environment.
尽管低频听力在蛙类中占主导地位，但仍有少数青蛙物种在某些环境背景下进化出高频通讯。是最显著的具有高频极限的蛙类；它是已知唯一专门发出超声信号的蛙类物种。对两栖动物乳头和基底乳头的畸变产物耳声发射特征进行了分析，以深入了解负责高频/超声敏感性的结构。我们的结果证实了该物种发声谱与内耳调谐的匹配。与大多数蛙类相比，有一个超扩展的听觉范围，从可听到超声频率，远远超出了以前为两栖动物耳朵建立的“光谱极限”。在的内耳中表现出的异常高频敏感性说明了听觉系统的显著可塑性，以及进化可以在多大程度上改变一个感觉系统使其适应环境。
