Preliminary analysis of echolocation signals produced by fleeing Irrawaddy dolphins (<i>Orcaella brevirostris</i>)

JIANG Ying; ZHANG Xuelei; YANG Zhiguo; JAAMAN Saifullah Arifin; XU Qinzeng; MUDA Azmi Marzuki; MUHAMAD Hairul Masrini

doi:10.1007/s13131-019-1373-y

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Article Navigation > Acta Oceanologica Sinica > 2019 > 38(1): 85-89

JIANG Ying, ZHANG Xuelei, YANG Zhiguo, JAAMAN Saifullah Arifin, XU Qinzeng, MUDA Azmi Marzuki, MUHAMAD Hairul Masrini. Preliminary analysis of echolocation signals produced by fleeing Irrawaddy dolphins (Orcaella brevirostris)[J]. Acta Oceanologica Sinica, 2019, 38(1): 85-89. doi: 10.1007/s13131-019-1373-y

Citation:

JIANG Ying, ZHANG Xuelei, YANG Zhiguo, JAAMAN Saifullah Arifin, XU Qinzeng, MUDA Azmi Marzuki, MUHAMAD Hairul Masrini. Preliminary analysis of echolocation signals produced by fleeing Irrawaddy dolphins (Orcaella brevirostris)[J]. Acta Oceanologica Sinica, 2019, 38(1): 85-89. doi: 10.1007/s13131-019-1373-y

Citation:

JIANG Ying, ZHANG Xuelei, YANG Zhiguo, JAAMAN Saifullah Arifin, XU Qinzeng, MUDA Azmi Marzuki, MUHAMAD Hairul Masrini. Preliminary analysis of echolocation signals produced by fleeing Irrawaddy dolphins (Orcaella brevirostris)[J]. Acta Oceanologica Sinica, 2019, 38(1): 85-89. doi: 10.1007/s13131-019-1373-y

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Preliminary analysis of echolocation signals produced by fleeing Irrawaddy dolphins (Orcaella brevirostris)

doi: 10.1007/s13131-019-1373-y

1.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China;Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
2.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China;Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
3.
China National Deep Sea Center, Ministry of Natural Resources, Qingdao 266237, China
4.
Institute of Oceanography & Environment, University Malaysia Terengganu, Kuala Terengganu 21030, Malaysia
5.
Key Laboratory of Underwater Acoustics and Marine Information Technology, Department of Applied Marine Physics & Engineering, College of Ocean and Earth, Xiamen University, Xiamen 361102, China

Received Date: 2018-05-07

Abstract

Abstract

In this study, echolocation signals were recorded from a wild Irrawaddy dolphin (Orcaella brevirostris) in shallow water in the Bay of Brunei. During sound recording, a small fishing boat engine startled a nearby Irrawaddy dolphin and began chasing it on two occasions. Variations in the acoustic parameters were detected. When the Irrawaddy dolphin was startled and chased, the sound pressure level, number of click trains per minute, pulse number, and average inter-pulse interval (PI) per click train were all affected. The PI increased and exhibited a slight downward trend during the chase. The increase in PI indicated an increase in the inspection distance as the dolphin escaped. Thus, Irrawaddy dolphins may adapt their echolocation signals to stand out from ambient noise in the wild and to improve their search efforts in potentially risky situations. Appropriate management of the burst noise around the dolphins is important.
- click train,
- echolocation signal,
- Irrawaddy dolphin,
- signal change

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References(18)

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