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http://dx.doi.org/10.13047/KJEE.2015.29.6.858

Postnatal Development of Echolocation Vocalizations in the Serotine Bat, Eptesicus serotinus (Chiroptera: Vespertilionidae)  

Chung, Chul-Un (Gyeongju National Park Office, Korea National Park Service)
Han, Sang-Hoon (National Institute of Biological Resources)
Kim, Sung-Chul (Dept. of Life Science, Dongguk Univ.)
Lim, Chun-Woo (Dept. of Life Science, Dongguk Univ.)
Cha, Jin-Yeol (National Institute of Ecology)
Publication Information
Korean Journal of Environment and Ecology / v.29, no.6, 2015 , pp. 858-864 More about this Journal
Abstract
Developmental changes in the vocal signals of serotine bats (Eptesicus serotinus) during their infancy were examined in this study. The analysis was conducted on 4 infant serotine bats from 1 to 40 days after their birth. Pulse duration (PD), pulse interval (PI), peak frequency (PF), maximum frequency ($F_{MAX}$), minimum frequency ($F_{MIN}$), and bandwidth (BW) were measured. As the bats grew, their vocalizations became increasingly consistent and similar to those of adults. For infant bats, PD and PI decreased as they grew older, whereas PF, $F_{MAX}$, $F_{MIN}$, and BW increased. The greatest change in vocalizations was observed between the $10^{th}$ and $20^{th}$ days after birth. Also, PF, $F_{MAX}$, $F_{MIN}$ and BW, which describe sound frequency, increased dramatically during the period between the $10^{th}$ and the $20^{th}$ days. In contrast, the greatest change in PD occurred between the $30^{th}$ and $40^{th}$ days after birth. The results collected in this study suggest that frequency increased as the contraction ability of the muscles developed by around 20 days of age. Muscle relaxation ability, which is related to PD, was found to develop significantly at 30 to 40 days of age. According to the results of this study, although 40 day-old infant bats are not yet able to fly, their vocal signals were similar to those of adults. This indicates that vocal development and flying activity develop separately in young bats.
Keywords
FLYING ACTIVITY; INFANT BAT; VOCAL DEVELOPMENT; VOCAL SIGNAL;
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Times Cited By KSCI : 3  (Citation Analysis)
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