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

作　　者：Ying Jiang Xuelei Zhang Zhiguo Yang Saifullah Arifin Jaaman Qinzeng Xu Azmi Marzuki Muda Hairul Masrini Muhamad 

机构地区：[1]First Institute of Oceanography, Ministry of Natural Resources [2]Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao) [3]Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Qingdao) [4]China National Deep Sea Center, Ministry of Natural Resources [5]Institute of Oceanography & Environment, University Malaysia Terengganu [6]Key Laboratory of Underwater Acoustics and Marine Information Technology, Department of Applied Marine Physics & Engineering, College of Ocean and Earth, Xiamen University

出　　处：《Acta Oceanologica Sinica》2019年第1期85-89,共5页海洋学报（英文版）

基　　金：The National Key R&D Program of China under contract No.2017YFC1405100;the Key Laboratory of Marine Ecology and Environmental Science and Engineering,Ministry of Natural Resources under contract No.MESE-2016-05;the National Natural Science Foundation of China-Shandong Joint Fund for Marine Ecology and Environmental Sciences under contract No.U1406403;the China-ASEAN Maritime Cooperation Fund

摘　　要：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.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.

关 键 词：CLICK TRAIN ECHOLOCATION SIGNAL Irrawaddy DOLPHIN SIGNAL change 

分 类 号：P[天文地球]