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Published on: September 3, 2015
Developmental changes in ultrasonic vocalizations by infant Japanese echolocating bats, Pipistrellus abramus
Shizuko Hiryu1, Hiroshi Riquimaroux
1Faculty of Life and Medical Sciences, Bio-navigation Research Center, Doshisha University, Kyotanabe, 610-0321, Japan. shiryu@mail.doshisha.ac.jp
Abstract:
Developmental changes in vocalizations by Pipistrellus abramus were investigated during the first post-natal month. Vocalizations by pups on the day of birth were frequency-modulated ultrasounds from 30.0 ± 4.0 kHz to 19.3 ± 1.9 kHz with multiple harmonics. The terminal frequency of the second harmonic (TF(2)) of pup vocalizations corresponded to that of the fundamental (TF(1)) in adult bats (41.4 ± 2.6 kHz), suggesting that pup vocalizations can be easily detected by the mother. In addition, there are two types of infant vocalization: short duration echolocation precursor and long duration isolation calls, which showed separate developmental patterns over time.
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