Premium
High‐frequency whistles of Irrawaddy dolphins ( Orcaella brevirostris ) recorded in Brunei Bay
Author(s) -
Jiang Ying,
Liu Zongwei,
Yang Chunmei,
Lü Liangang,
Yu Xiaolin,
Huang Longfei,
Zhang Xuelei,
Yang Zhiguo,
Yang Guangbing,
Sun Lu,
Jaaman Saifullah Arifin,
Muda Azmi Marzuki
Publication year - 2020
Publication title -
marine mammal science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.723
H-Index - 78
eISSN - 1748-7692
pISSN - 0824-0469
DOI - 10.1111/mms.12681
Subject(s) - bay , acoustics , human echolocation , range (aeronautics) , geography , geology , physics , oceanography , engineering , aerospace engineering
Studies of the whistles of Irrawaddy dolphins ( Orcaella brevirostris ) have traditionally been restricted to analyses of the human audio range (below 20 kHz). In this study, broadband acoustic recordings of Irrawaddy dolphins in Brunei Bay were obtained using a sampling frequency of 512 kHz. Among the 984 whistles collected, eight (0.81%) high‐frequency whistles were detected with fundamentals above 18.4 kHz, which is the reported maximum frequency. Four (50%) of these whistles had the entire fundamentals in the ultrasonic frequency range (above 20 kHz), where 52.3 kHz was the maximum frequency. This is the first description of the ultrasonic components of Irrawaddy dolphin whistles. Our findings demonstrate that the whistles of Irrawaddy dolphins span a wider frequency range than previously published.