Comparison between visual and passive acoustic detection of finless porpoises in the Yangtze River, China

The Journal of the Acoustical Society of America
T AkamatsuZ Wei

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 ,EPa. 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-freq...Continue Reading

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Citations

Apr 12, 2011·The Journal of the Acoustical Society of America·Holger Klinck, David K Mellinger
Sep 15, 2005·The Journal of the Acoustical Society of America·Kexiong WangJianqiang Xiao
Sep 8, 2010·The Journal of the Acoustical Society of America·Songhai LiSatoko Kimura
Jul 15, 2006·The Journal of the Acoustical Society of America·Kotaro IchikawaKanjana Adulyanukosol
Oct 31, 2006·The Journal of the Acoustical Society of America·Songhai LiTomonari Akamatsu
Sep 29, 2006·The Journal of the Acoustical Society of America·Chika TsutsumiKanjana Adulyanukosol
Oct 7, 2011·The Journal of the Acoustical Society of America·Lijun DongSatoko Kimura
Jan 29, 2009·The Journal of the Acoustical Society of America·Satoko KimuraNobuaki Arai
Aug 1, 2016·The Journal of the Acoustical Society of America·Heather L HeenehanDavid W Johnston
Feb 4, 2019·The Journal of the Acoustical Society of America·Wenyu LuoYu Zhang

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