Potential effects of anthropogenic noise on echolocation behavior in horseshoe bats.
Potential effects of anthropogenic noise on echolocation behavior in horseshoe bats.
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DOI：
10.4161/cib.24753
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发表时间：
2013-07-01
影响因子：
--
通讯作者：
Metzner W
中科院分区：
文献类型：
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作者：
Hage SR;Metzner W
我们之前报道过，带通滤波噪声（BFN，带宽 20 kHz）以不同方式影响马蹄蝠的回声定位行为，具体取决于蝙蝠听力范围 BFN 内的哪个频率为中心。我们发现，当 BFN 以蝙蝠叫声的主导频率为中心时，叫声幅度只会增加。相比之下，所有以回声定位呼叫的主频率为中心或以下的 BFN 刺激的呼叫频率都会发生变化，包括当 BFN 以 20 kHz (BFN20) 为中心时，这远远低于蝙蝠回声定位呼叫频率的范围。在本研究中，我们重点关注 BFN20 的掩蔽效应，并将其用作人为噪声的模型刺激，以研究该噪声如何影响回声定位呼叫的呼叫参数，例如频率、幅度、持续时间和速率。我们表明，只有呼叫频率会因屏蔽 BFN20 而发生变化，而测试的所有其他呼叫参数均未表现出与噪声相关的变化。我们的研究结果为定量预测人为噪声对蝙蝠回声定位行为的影响提供了经验基础。他们还强调需要更好地了解人为噪声对生物声学通信和定向系统的总体影响。
We previously reported that band-pass filtered noise (BFN, bandwidth 20 kHz) affected the echolocation behavior of horseshoe bats in different ways depending on which frequencies within the bats’ hearing range BFN was centered. We found that call amplitudes only increased when BFN was centered on the dominant frequency of the bats' calls. In contrast, call frequencies were shifted for all BFN stimuli centered on or below the dominant frequency of echolocation calls including when BFN was centered at 20 kHz (BFN20), which is far below the range of the bats’ echolocation call frequencies. In the present study we focused on masking effects of BFN20 and used it as a model stimulus for anthropogenic noise to investigate how this noise affected call parameters of echolocation calls, such as their frequency, amplitude, duration and rate. We show that only call frequencies shifted in response to masking BFN20, whereas all other call parameters tested exhibited no noise-related changes. Our findings provide an empirical basis to quantitatively predict the impact of anthropogenic noise on echolocation behavior in bats. They also emphasize the need for a better understanding of the impact of anthropogenic noise on bioacoustic communication and orientation systems in general.