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Adaptive echolocation sounds of insectivorous bats, Pipistrellus abramus, during foraging flights in the field.

Authors
  • Hiryu, Shizuko
  • Hagino, Tomotaka
  • Fujioka, Emyo
  • Riquimaroux, Hiroshi
  • Watanabe, Yoshiaki
Type
Published Article
Journal
The Journal of the Acoustical Society of America
Publication Date
Aug 01, 2008
Volume
124
Issue
2
Identifiers
DOI: 10.1121/1.2947629
PMID: 18681502
Source
Medline
License
Unknown

Abstract

Echolocation pulses emitted by wild Pipistrellus abramus were investigated while foraging for insects in the field. Similar to other European pipistrelles, the frequency structure during foraging varied. During the search phase, the bats emitted long shallow frequency-modulated pulses 9-11 ms in duration, whereas the maximum pulse duration of the bats approaching a large target wall in the laboratory was 3 ms. No significant difference was observed between decreases in the interpulse interval during these two approach flights. It is concluded that the bats use a long quasi-constant frequency pulse to find a weak echo from a small prey target.

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