Vol. 60, 2021
(update: 2021.03.04; 05.05)
Vocalization Development in
Geoffroy’s bat, Myotis emarginatus
Mehdizadeh1,*, Hojjat Eghbali1, and Mozafar Sharifi1
of Biology, Faculty of Science, Razi University, Baghabrisham,
6714967346, Kermanshah, Iran. *Correspondence: E-mail:
E-mail: firstname.lastname@example.org (Sharifi);
Received 13 July 2020 / Accepted 24
Communicated by Benny K.K. Chan
Postnatal development of
vocalization has been studied in a small number of bats, not including
the Geoffroy’s bat, Myotis
emarginatus. In the present study, we investigated vocalization
development at a maternity roost of M.
in Kerend Cave in western Iran by sequential measurement of
acoustic parameters in known-age neonates using mark-recapture
sampling. Newborn pups of M.
produced both short and isolation calls. Duration of short calls of
1-day-old pups was on average 7.56 ± 0.05 ms and decreased during
postnatal development to reach an adult-like duration of 2.78 ± 0.13 ms
in the third week. Myotis emarginatus
emitted various types of isolation calls including classic, UP-tail-FM
and CF-tail during postnatal growth. As bat pups grew, both short and
isolation calls changed in their spectro-temporal structure.
Discriminant function analyses showed that each bat pup has a vocal
signature that facilitates mother-infant communication. The current
study reveals that M. emarginatus
pups are highly vocal at birth, but gradually elaborate their sounds
with an increase in peak, start and end frequencies as well as with a
decrease in call duration throughout the postnatal growth period.
Key words: Echolocation, Frequency-modulated,
Syllable, Isolation call, Development.
Citation: Mehdizadeh R, Eghbali H, Sharifi
M. 2021. Vocalization development in Geoffroy’s bat, Myotis emarginatus (Chiroptera:
Vespertilionidae). Zool Stud 60:20.