Three types of pulsed signal trains emitted by Indo-Pacific humpback dolphins (Sousa chinensis) in Beibu Gulf, South China Sea
Pulsed signal trains comprising clicks, buzzes, and burst-pulses play important roles in the life activities of odontocetes, but they have not been distinguished in Indo-Pacific humpback dolphins. Underwater vocalizations of this species were recorded from 27 September to 2 October 2019 in the Beibu...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-08-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2022.915668/full |
| _version_ | 1811344100153098240 |
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| author | Xiao-yan Wang Xiao-yan Wang Ying Jiang Ying Jiang Ying Jiang Zong-wei Liu Zong-wei Liu Zong-wei Liu Chun-mei Yang Chun-mei Yang Chun-mei Yang Bing-yao Chen Lian-gang Lü Lian-gang Lü Lian-gang Lü |
| author_facet | Xiao-yan Wang Xiao-yan Wang Ying Jiang Ying Jiang Ying Jiang Zong-wei Liu Zong-wei Liu Zong-wei Liu Chun-mei Yang Chun-mei Yang Chun-mei Yang Bing-yao Chen Lian-gang Lü Lian-gang Lü Lian-gang Lü |
| author_sort | Xiao-yan Wang |
| collection | DOAJ |
| description | Pulsed signal trains comprising clicks, buzzes, and burst-pulses play important roles in the life activities of odontocetes, but they have not been distinguished in Indo-Pacific humpback dolphins. Underwater vocalizations of this species were recorded from 27 September to 2 October 2019 in the Beibu Gulf, South China Sea. Pulsed signal trains were detected with variations in the pulsed signal number (range of 6–76), mean inter-pulse interval (IPIs_m: 0.1–315 ms), and mean duration (D ranged from tens to thousands of milliseconds). Principal component analysis and hierarchical cluster analysis based on six acoustic parameters in the pulsed signal trains identified three categories of trains designated as clicks, burst-pulses, and buzzes. Buzzes and burst-pulses (different from those described in previous research) were detected for the first time in Indo-Pacific humpback dolphins in China. The results indicated that the IPIs_m was longest for clicks but shortest for buzzes, and the D values were longer for both clicks and burst-pulses than buzzes. The three train types could be identified based on the IPIs_m, with threshold values of 4.9 and 15.5 ms. The significant variations in the three vocalization types were related to surface behaviors, and buzzes could have a special function in foraging by this species, thereby requiring further research. These findings may facilitate future quantitative evaluations of the echolocation performance in wild Indo-Pacific humpback dolphins and provide important guidance regarding acoustic observations and the identification of this species. |
| first_indexed | 2024-04-13T19:41:46Z |
| format | Article |
| id | doaj.art-0cf03713d50548e7bcf86bc4a6561bc9 |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-13T19:41:46Z |
| publishDate | 2022-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-0cf03713d50548e7bcf86bc4a6561bc92022-12-22T02:32:51ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452022-08-01910.3389/fmars.2022.915668915668Three types of pulsed signal trains emitted by Indo-Pacific humpback dolphins (Sousa chinensis) in Beibu Gulf, South China SeaXiao-yan Wang0Xiao-yan Wang1Ying Jiang2Ying Jiang3Ying Jiang4Zong-wei Liu5Zong-wei Liu6Zong-wei Liu7Chun-mei Yang8Chun-mei Yang9Chun-mei Yang10Bing-yao Chen11Lian-gang Lü12Lian-gang Lü13Lian-gang Lü14First Institute of Oceanography, and Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao, ChinaShandong Key Laboratory of Marine Science and Numerical Modeling, Qingdao, ChinaFirst Institute of Oceanography, and Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao, ChinaLaboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology, Qingdao, ChinaShandong Key Laboratory of Marine Science and Numerical Modeling, Qingdao, ChinaFirst Institute of Oceanography, and Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao, ChinaLaboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology, Qingdao, ChinaShandong Key Laboratory of Marine Science and Numerical Modeling, Qingdao, ChinaFirst Institute of Oceanography, and Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao, ChinaLaboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology, Qingdao, ChinaShandong Key Laboratory of Marine Science and Numerical Modeling, Qingdao, ChinaJiangsu Key Laboratory for Biodiversity and Biotechnology, Nanjing Normal University, Nanjing, ChinaFirst Institute of Oceanography, and Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao, ChinaLaboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology, Qingdao, ChinaShandong Key Laboratory of Marine Science and Numerical Modeling, Qingdao, ChinaPulsed signal trains comprising clicks, buzzes, and burst-pulses play important roles in the life activities of odontocetes, but they have not been distinguished in Indo-Pacific humpback dolphins. Underwater vocalizations of this species were recorded from 27 September to 2 October 2019 in the Beibu Gulf, South China Sea. Pulsed signal trains were detected with variations in the pulsed signal number (range of 6–76), mean inter-pulse interval (IPIs_m: 0.1–315 ms), and mean duration (D ranged from tens to thousands of milliseconds). Principal component analysis and hierarchical cluster analysis based on six acoustic parameters in the pulsed signal trains identified three categories of trains designated as clicks, burst-pulses, and buzzes. Buzzes and burst-pulses (different from those described in previous research) were detected for the first time in Indo-Pacific humpback dolphins in China. The results indicated that the IPIs_m was longest for clicks but shortest for buzzes, and the D values were longer for both clicks and burst-pulses than buzzes. The three train types could be identified based on the IPIs_m, with threshold values of 4.9 and 15.5 ms. The significant variations in the three vocalization types were related to surface behaviors, and buzzes could have a special function in foraging by this species, thereby requiring further research. These findings may facilitate future quantitative evaluations of the echolocation performance in wild Indo-Pacific humpback dolphins and provide important guidance regarding acoustic observations and the identification of this species.https://www.frontiersin.org/articles/10.3389/fmars.2022.915668/fullburst-pulsebuzzclassificationclickforagingIndo-Pacific humpback dolphin |
| spellingShingle | Xiao-yan Wang Xiao-yan Wang Ying Jiang Ying Jiang Ying Jiang Zong-wei Liu Zong-wei Liu Zong-wei Liu Chun-mei Yang Chun-mei Yang Chun-mei Yang Bing-yao Chen Lian-gang Lü Lian-gang Lü Lian-gang Lü Three types of pulsed signal trains emitted by Indo-Pacific humpback dolphins (Sousa chinensis) in Beibu Gulf, South China Sea Frontiers in Marine Science burst-pulse buzz classification click foraging Indo-Pacific humpback dolphin |
| title | Three types of pulsed signal trains emitted by Indo-Pacific humpback dolphins (Sousa chinensis) in Beibu Gulf, South China Sea |
| title_full | Three types of pulsed signal trains emitted by Indo-Pacific humpback dolphins (Sousa chinensis) in Beibu Gulf, South China Sea |
| title_fullStr | Three types of pulsed signal trains emitted by Indo-Pacific humpback dolphins (Sousa chinensis) in Beibu Gulf, South China Sea |
| title_full_unstemmed | Three types of pulsed signal trains emitted by Indo-Pacific humpback dolphins (Sousa chinensis) in Beibu Gulf, South China Sea |
| title_short | Three types of pulsed signal trains emitted by Indo-Pacific humpback dolphins (Sousa chinensis) in Beibu Gulf, South China Sea |
| title_sort | three types of pulsed signal trains emitted by indo pacific humpback dolphins sousa chinensis in beibu gulf south china sea |
| topic | burst-pulse buzz classification click foraging Indo-Pacific humpback dolphin |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2022.915668/full |
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