title: Adaptive echolocation sounds of insectivorous bats, Pipistrellus abramus, during foraging flights in the field.
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.
authors.forename: Shizuko
authors.initials: S
authors.lastname: Hiryu
authors.forename: Tomotaka
authors.initials: T
authors.lastname: Hagino
authors.forename: Emyo
authors.initials: E
authors.lastname: Fujioka
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Riquimaroux
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Watanabe
mesh_terms: D000818:Animals; D002685:Chiroptera / Q000502:physiology*; D004032:Diet; D004455:Echolocation; D005247:Feeding Behavior; D005426:Flight, Animal; D007313:Insecta; D011235:Predatory Behavior; D013997:Time Factors