Variability in the echolocation of Tadarida brasiliensis:: effects of geography and local acoustic environment
Variability in the echolocation of Tadarida brasiliensis:: effects of geography and local acoustic environment
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DOI：
10.1016/j.anbehav.2006.12.006
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发表时间：
2007-08-01
期刊：
影响因子：
2.5
通讯作者：
McCracken, Gary F.
中科院分区：
文献类型：
--
作者：
Gillam, Erin H.;McCracken, Gary F.
我们研究了巴西无尾蝙蝠（Tadarida brasiliensis）的回声定位叫声在广泛的地理范围内的变化，以及对当地环境变量的响应。在美国，整个物种范围内的种群之间的叫声结构存在显著差异，但这种差异与地理距离或当地天气条件无关。观察到的不同地点之间的差异主要是由于蝙蝠之间的差异，以及个体可以实现的呼叫结构的灵活性。在这项研究中，我们观察到，在昆虫合唱的高频声音中记录的蝙蝠比在沉默中记录的蝙蝠使用更高的呼叫频率。这让我们测试了蝙蝠根据当地环境噪音调整回声定位呼叫结构的假设。我们对自由飞行的巴西无尾蝙蝠进行了实验操控的超声波昆虫声音广播，发现昆虫声音刺激频率与蝙蝠使用的叫声频率呈正相关。这些结果证明，蝙蝠调整回声定位呼叫结构，以避免来自周围环境噪声的声干扰。(c) 2007年动物行为研究协会。Elsevier Ltd.出版。版权所有。
We examined variation in the echolocation calls of Brazilian free-tailed bats, Tadarida brasiliensis, on a broad geographical scale and in response to local environmental variables. Significant differences in call structure were observed among populations throughout the species range in the United States, but this variation was not associated with geographical distance or local weather conditions. Observed variability between sites was primarily due to differences between bats, and the flexibility in call structure that can be achieved by individuals. During this study, we observed that bats recorded in the presence of highfrequency sounds from chorusing insects used higher call frequencies than bats recorded in silence. This led us to test the hypothesis that bats adjust echolocation call structure in response to local ambient noise. We broadcast experimentally manipulated ultrasonic insect sounds to free-flying Brazilian free-tailed bats and found a positive correlation between the frequency of the insect sound stimulus and the call frequencies used by bats. These results document that bats adjust echolocation call structure to avoid acoustic interference from ambient noise in their local environment. (c) 2007 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.