| Comparison between visual and passive acoustic detection of finless porpoises in the Yangtze river, China | |
| Akamatsu, T; Wang, D; Wang, KX; Wei, Z; Akamatsu, T, Natl Res Inst Fisheries Engn, Kashiwa, Chiba 3140421, Japan | |
| 2001 | |
| Source Publication | JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
 |
| Volume | 109Issue:4Pages:1723-1727 |
| Abstract | Recently, sonar signals and other sounds produced by cetaceans have been used for acoustic detection of individuals and groups in the wild. However, the detection probability ascertained by concomitant visual survey has not been demonstrated extensively. The finless porpoises (Neophocaena phocaenoides) have narrow band and high-frequency sonar signals, which are distinctive from background noises. Underwater sound monitoring with hydrophones (B&K8103) placed along the sides of a research vessel, concurrent with visual observations was conducted in the Yangtze River from Wuhan to Poyang Lake in 1998 in China. The peak to peak detection threshold was set at 133 dB re 1 mu Pa. With this threshold level, porpoises could be detected reliably within 300 m of the hydrophone. In a total of 774-km cruise, 588 finless porpoises were sighted by visual observation and 44 864 ultrasonic pulses were recorded by the acoustical observation system. The acoustic monitoring system could detect the presence of the finless porpoises 82% of the time. A false alarm in the system occurred with a frequency of 0.9%. The high-frequency acoustical observation is suggested as an effective method for field surveys of small cetaceans, which produce high-frequency sonar signals. (C) 2001 Acoustical Society of America. |
| Keyword | Neophocaena-phocaenoides Echolocation Signals Phocoena-phocoena Localization Density Range |
| Department | Natl Res Inst Fisheries Engn, Kashiwa, Chiba 3140421, Japan; Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China |
| Subject Area | Acoustics |
| Indexed By | SCI |
| WOS ID | WOS:000167932600042 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ihb.ac.cn/handle/152342/10016 |
| Collection | 期刊论文 |
| Corresponding Author | Akamatsu, T, Natl Res Inst Fisheries Engn, Kashiwa, Chiba 3140421, Japan |
| Recommended Citation GB/T 7714 | Akamatsu, T,Wang, D,Wang, KX,et al. Comparison between visual and passive acoustic detection of finless porpoises in the Yangtze river, China[J]. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA,2001,109(4):1723-1727. |
| APA | Akamatsu, T,Wang, D,Wang, KX,Wei, Z,&Akamatsu, T, Natl Res Inst Fisheries Engn, Kashiwa, Chiba 3140421, Japan.(2001).Comparison between visual and passive acoustic detection of finless porpoises in the Yangtze river, China.JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA,109(4),1723-1727. |
| MLA | Akamatsu, T,et al."Comparison between visual and passive acoustic detection of finless porpoises in the Yangtze river, China".JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 109.4(2001):1723-1727. |
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