Assessing the impact of engine and non-engine urban noises on the calls of urban frogs: a natural experiment

IF 1.1 4区 生物学 Q4 BEHAVIORAL SCIENCES
José Manuel Serrano, Zeltzin Karina Vázquez-Hernández, Carlos A. Hernández-Jiménez, Esaú Toaki Villarreal-Olvera, Leticia M. Ochoa-Ochoa
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Abstract

Urban noise can potentially disturb the acoustic signals of animals inhabiting urban areas. Although a wide variety of noises from different sources is common in cities, the impact of non-engine noise on animal calls is less studied. In a natural experiment, we evaluated the effect of different urban noises on the advertisement calls of urban frogs (Eleutherodactylus nitidus) in the metropolitan area of Puebla, Mexico. We recorded and analyzed 672 advertisement calls from 28 male frogs and the corresponding environmental noises from three distinct localities. Our analysis focused on four acoustic properties of the calls: inter-call interval, call duration, dominant frequency, and call amplitude. To standardize the amplitude measurements of sound pressure levels produced by noise and frog calls, we employed a practical approach using a reference signal for calibration. We treated the longitudinal data of different noises occurring before, during, and after advertisement calls as repeated measures within the urban locations. During our samplings, frogs called amidst spontaneous urban noises, including dog barking, fireworks, and vehicle engine sounds. Our results indicate that vehicle engine sounds and dog barking do not cause significant distortions in the calls of these urban frogs. However, we observed slight variations in the dominant frequency of calls, decreasing by 11 Hz, during and after fireworks. Given the observed plasticity of E. nitidus in response to noise, urban noises may not pose a severe problem for this urban frog.

Abstract Image

评估城市发动机噪音和非发动机噪音对城市青蛙叫声的影响:自然实验
城市噪声可能会干扰栖息在城市地区的动物的声学信号。虽然来自不同来源的各种噪声在城市中很常见,但非发动机噪声对动物叫声的影响研究较少。在一项自然实验中,我们评估了不同城市噪音对墨西哥普埃布拉大都市区的城市青蛙(Eleutherodactylus nitidus)广告叫声的影响。我们记录并分析了来自三个不同地区的 28 只雄蛙的 672 次广告鸣叫以及相应的环境噪声。我们的分析主要集中在叫声的四个声学特性上:叫声间隔、叫声持续时间、主频和叫声振幅。为了使噪声和蛙叫声产生的声压级振幅测量标准化,我们采用了一种实用的方法,即使用参考信号进行校准。我们将广告鸣叫之前、期间和之后出现的不同噪声的纵向数据作为城市地点内的重复测量数据。在采样过程中,青蛙是在自发的城市噪音(包括狗叫声、烟花爆竹声和汽车发动机声)中鸣叫的。结果表明,汽车引擎声和狗叫声不会对这些城市青蛙的叫声造成明显的扭曲。然而,我们观察到,在烟花爆竹声中和之后,蛙叫的主频率略有变化,降低了11赫兹。鉴于观察到的E. nitidus对噪声的可塑性,城市噪声可能不会对这种城市青蛙造成严重问题。
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来源期刊
acta ethologica
acta ethologica 生物-动物学
CiteScore
1.90
自引率
0.00%
发文量
18
审稿时长
>12 weeks
期刊介绍: acta ethologica publishes empirical and theoretical research papers, short communications, commentaries, reviews and book reviews as well as methods papers in the field of ethology and related disciplines, with a strong concentration on the behavior biology of humans and other animals. The journal places special emphasis on studies integrating proximate (mechanisms, development) and ultimate (function, evolution) levels in the analysis of behavior. Aspects of particular interest include: adaptive plasticity of behavior, inter-individual and geographic variations in behavior, mechanisms underlying behavior, evolutionary processes and functions of behavior, and many other topics. acta ethologica is an official journal of ISPA, CRL and the Portuguese Ethological Society (SPE)
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