Echolocation Performance and Call Structure in the Megachiropteran Fruit-Bat Rousettus aegyptiacus
Echolocation Performance and Call Structure in the Megachiropteran Fruit-Bat Rousettus aegyptiacus
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DOI：
10.3161/001.005.0205
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发表时间：
2003-12
期刊：
影响因子：
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通讯作者：
D. Waters;C. Vollrath
中科院分区：
文献类型：
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作者：
D. Waters;C. Vollrath
研究了回声定位果蝠埃及Rousettus aegyptiacus在飞行隧道内飞行时的叫声结构。叫声是一种持续时间在250时左右的冲动咔哒声，大部分能量发生在S的前100次叫声中。这样的叫声持续时间比以前报道的该物种的时间短得多。埃及斑潜蝇探测和躲避障碍物的能力在光和全黑两种情况下都进行了测试。蝙蝠在光线下测试时，能够检测和避开直径6 mm的导线的频率明显高于直径1.3 mm的导线。在黑暗中，同样的关系保持不变，发现和躲避障碍的能力没有下降。蝙蝠在光和暗的条件下都使用回声定位。因此，该物种在回声定位中使用的简单脉冲滴答声能够探测到直径至少6毫米或更小的电线。讨论了与极短持续时间信号相关的检测问题。该物种同时拥有良好的视觉系统和良好的回声定位系统，这对蝙蝠回声定位的进化具有重要意义。
The structure of the calls made by the echolocating fruit bat Rousettus aegyptiacus while flying within a flight tunnel were investigated. Calls are impulsive clicks lasting around 250 s, with most energy occurring during the first 100 s. Such a call duration is much shorter than that previously reported for this species. The ability of R. aegyptiacus to detect and avoid obstacles was tested in both the light and total darkness. Bats were able to detect and avoid 6 mm diameter wires significantly more often than 1.3 mm diameter wires when tested in the light. In the dark, the same relationship held, with no decrease in the ability to detect and avoid the obstacles. Bats used echolocation in both the light and the dark conditions. The simple impulsive clicks used in echolocation by this species are thus able to detect wires of at least 6 mm in diameter and probably smaller. The detection problems associated with very short duration signals is discussed. The possession of both a good visual system, and a good echolocation system in this species has implications for the evolution of echolocation in bats.