2011 Fiscal Year Final Research Report
Navigation strategy of acoustical sensing by bats.
| Project/Area Number |
21760318
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Measurement engineering
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| Research Institution | Doshisha University |
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Principal Investigator |
HIRYU Shizuko 同志社大学, 生命医科学部, 准教授 (70449510)
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| Project Period (FY) |
2009 – 2011
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| Keywords | コウモリ / 超音波センシング / 生物ソナー |
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| Research Abstract |
We investigated how CF-FM bats adjust pulse direction and beam width according to prey position using 31-ch microphone array system. When the bat started terminal phase at approximately 1 m from the moth, G. pryeri sometime showed distinctive evasive flight. At the same time, the bats broadened the beam width of some emissions in both horizontal and vertical planes. When the moth starts evasive flight, tracking accuracy of echolocation by the bat would decrease compared to that during the approach phase. However, in 97% of emissions during the terminal phase, the beam width of the pulse was wider than the misalignment(target direction-pulse direction) as well as during search and approach phase. These findings indicate the bats actively adjusted their beam width to retain moving target in spatial window of echolocation at final stage of capturing.
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