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Development of Vocal Signals in the Pipistrellus abramus(Chiroptera: Vespertilionidae)  

Chung, Chul-Un (Department of Life Science, Dongguk Universtiy)
Han, Sang-Hoon (National Institute of Biological Resources)
Lee, Chong-Il (Department of Life Science, Dongguk Universtiy)
Publication Information
Korean Journal of Environment and Ecology / v.24, no.2, 2010 , pp. 202-208 More about this Journal
Abstract
This study reports developmental changes in the vocal signals produced by infant or young Pipistrellus abramus. In contrast to adult bats, infant bats of the P. abramus emitted calls characterized by multi harmonics and variable signal patterns. Infants at two day of age emitted a irregular signal and showed gentle FM signals between 10 and 20 days. After about 40 days of age, the young bats emitted similar signals to the echolocation calls of adults. As the infant bats growing up, vocal signals trend showen a decrease in pulse duration(p<0.001), pulse interval(p<0.001) and number of harmonic(p<0.001). And the peak frequency(p<0.001), starting frequency(p<0.001) and ending frequency(p<0.001) in infant bats increased with the age. The largest change in pulse interval occurred in 5 days. And the pulse duration, peak frequency, starting frequency and ending frequency of the bat's sounds changed most dramatically in 25 days of age.
Keywords
FM SIGNAL; FREQUENCY; PULSE; ECHOLOCATION; VOCALIZATION DEVELOPMENT;
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