| JIANG Ying,ZHANG Xuelei,YANG Zhiguo,JAAMAN Saifullah Arifin,XU Qinzeng,MUDA Azmi Marzuki,MUHAMAD Hairul Masrini. 2019. Preliminary analysis of echolocation signals produced by fleeing Irrawaddy dolphins (Orcaella brevirostris). Acta Oceanologica Sinica, 38(1):85－89 |
| Preliminary analysis of echolocation signals produced by fleeing Irrawaddy dolphins (Orcaella brevirostris) |
| 伊洛瓦底海豚被追逐时回声定位信号特征变化的初步分析 |
| Received:May 07, 2018 |
| DOI：10.1007/s13131-019-1373-y |
| Key words:click train echolocation signal Irrawaddy dolphin signal change |
| 中文关键词: 伊洛瓦底海豚 生物声纳信号 嘀嗒声信号串 信号变化特征 |
| 基金项目: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. |
| Author Name | Affiliation | E-mail | | JIANG Ying | 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 | | | ZHANG Xuelei | 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 | | | YANG Zhiguo | China National Deep Sea Center, Ministry of Natural Resources, Qingdao 266237, China | zg.yang@163.com | | JAAMAN Saifullah Arifin | Institute of Oceanography & Environment, University Malaysia Terengganu, Kuala Terengganu 21030, Malaysia | | | XU Qinzeng | 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 | | | MUDA Azmi Marzuki | Institute of Oceanography & Environment, University Malaysia Terengganu, Kuala Terengganu 21030, Malaysia | | | MUHAMAD Hairul Masrini | 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 | |
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| 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. |
| 中文摘要: |
| 本文的研究基于文莱湾浅水域的一头野生伊洛瓦底海豚水声定位信号的调查数据。在记录期间，有一艘渔船突然开启发动机，惊扰了其附近的一头伊洛瓦底海豚，接着渔船开始两次连续追逐海豚。这期间海豚回声定位信号的变化情况被记录下来。当伊洛瓦底海豚受惊吓被追逐时，信号的声压级、每分钟嘀嗒声信号串的发生次数、每个嘀嗒声信号串中的脉冲个数和平均脉冲间隔都发生了相应的变化。平均的脉冲间隔在事件发生的瞬间立即增大，并在追逐期间呈现轻微下降趋势。脉冲间隔的增大对应着探测距离的增加，代表着海豚对未知区域的探索能力，制约着它的逃离速度。数据记录结果的分析表明，伊洛瓦底海豚会根据外界干扰对发出的回声定位信号进行调整，改变自己对潜在危险的探查能力。分析结果同时提醒我们需要随海豚生存环境的噪声进行管理，避免突然的发动机操作或者追逐它们。 |
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