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KMID : 1024520170260060779
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Journal of the Environmental Sciences
2017 Volume.26 No. 6 p.779 ~ p.788
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Variation in Echolocation and Prey-capture Behavior of Rhinolophus ferrumequinum during Foraging Flight
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Jung Chul-Woon
Kim Seong-Chul
Jeon Young-Shin
Han Sang-Hoon
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Abstract
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In this study, we analyzed the changes in the echolocation and prey-capture behavior of the horseshoe bat Rhinolophus ferrumequinum from search phase to capture time. The experiment was conducted in an indoor free-flight room fitted with an ultra-high-speed camera. We found that the bats searched for food while hanging from a structure, and capturing was carried out using the flight membrane. In addition, it was confirmed that the mouth and uropatagium were continuously used in tandem during the capturing process. Furthermore, using Constant Frequency (CF), we confirmed that the prey catching method reflected the wing morphology and echolocation pattern of R. ferrumequinum. The echolocation analysis revealed that the pulse duration, pulse interval, peak frequency, start-FM-bandwidth, and CF duration decreased as the search phase approached the terminal phase. Detailed analysis of echolocation pulse showed that the end-FM bandwidth, which increases as it gets nearer to the capture time of prey, was closely related to the accurate grasp of the location of an insect. At the final moment of prey capture, the passive listening that stopped the divergence of the echolocation was identified; this was determined to be the process of minimizing the interruption from the echo of the echolocation call emitted from the bat itself and sound waves emitted from the prey.
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KEYWORD
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Capture behavior, Echolocation variation, FM-CF-FM, Wing morphology
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