Eavesdropping by bats on the feeding buzzes of conspecifics
Eavesdropping by bats on the feeding buzzes of conspecifics
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DOI：
10.1139/z07-060
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发表时间：
2007-07-01
影响因子：
1.4
通讯作者：
Gillam, E. H.
中科院分区：
文献类型：
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作者：
Gillam, E. H.
大多数蝙蝠的回声定位呼叫都是以高强度发出的，容易被附近的同类窃听。蝙蝠可能会特别注意“喂食嗡嗡声”，这种声音是在攻击空中石油昆虫之前发出的，表明附近地区可能存在猎物。虽然以前的工作已经表明，一些物种被吸引到喂养嗡嗡声，这些研究并没有提供一个良好的控制测试窃听，因为比较之间的反应自然和改变信号（例如，呼叫的前向广播与后向广播）。在这项研究中，我通过回放受控回声定位刺激来评估喂食嗡嗡声的重要性。我介绍了自由飞行的巴西自由尾蝙蝠，Tadarida brasiliensis（I。Geoffroy，1824），与回声定位呼叫序列，其中喂养嗡嗡声或存在或不存在，以及沉默控制。我确定的水平，蝙蝠活动的回声定位电话和蝙蝠通过记录在每个刺激的存在下，计数的数量，并发现显着更大的蝙蝠活动的广播，包含喂养嗡嗡声比广播没有喂养嗡嗡声或沉默控制。这些结果表明，蝙蝠是特别注意同种喂养嗡嗡声，窃听可能会让蝙蝠更容易找到丰富的昆虫猎物补丁。
Echolocation calls of most bats are emitted at high intensities and subject to eavesdropping by nearby conspecifics. Bats may be especially attentive to "feeding buzz" calls, which are emitted immediately before attack oil airborne insects and indicate the potential presence of prey in the nearby area. Although previous work has shown that some species are attracted to feeding buzzes, these studies did not provide a well-controlled test of eavesdropping, as comparisons were made between responses to natural and altered signals (e.g., forward versus backward broadcasts of calls). In this study, I assessed the importance of feeding buzzes by conducting playbacks of controlled echolocation stimuli. I presented free-flying Brazilian free-tailed bats, Tadarida brasiliensis (I. Geoffroy, 1824), with echolocation call sequences in which feeding buzz calls were either present or absent, as well as a silence control. I determined level, of bat activity by Counting the number of echolocation calls and bat passes recorded in the presence of each stimulus, and found significantly greater bat activity in response to broadcasts that contained feeding buzzes than to broadcasts without feeding buzzes or to the silence control. These results indicate that bats are especially attentive to conspecific feeding buzz calls and that eavesdropping may allow a bat to more readily locate rich patches of insect prey.