A passive acoustic monitoring method applied to observation and group size estimation of finless porpoises.
A passive acoustic monitoring method applied to observation and group size estimation of finless porpoises.
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DOI：
10.1121/1.1945487
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发表时间：
2005-08
期刊：
影响因子：
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通讯作者：
Ke‐Xiong Wang;Ding Wang;T. Akamatsu;Songhai Li;Jianqiang Xiao
中科院分区：
文献类型：
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作者：
Ke‐Xiong Wang;Ding Wang;T. Akamatsu;Songhai Li;Jianqiang Xiao
本研究旨在确定声学观测系统在当地河流条件下识别江豚的探测能力，并将结果与观测结果进行比较。在长江天鄂洲牛曲主航道上，每隔100-150米放置3 - 5台声波数据记录仪阵列，记录放养江豚（Neophocaena phocaenoides）的声纳信号。在2003年10月20日至22日和2004年10月17日至19日进行了两次声声观测和目视观测。在42小时的观察中，录得316只江豚，并录得7041个声纳信号。声学数据记录仪清晰地记录了鼠海豚的超声波信号，在150 m有效距离内检测到鼠海豚的存在，正确率为77.6%，虚警率为5.8%。结果表明，驻点被动声观察法可以有效地探测江豚的存在，并在估计江豚群体规模方面显示出潜力。记录信号的数量与视鼠海豚的群体规模之间存在正线性相关，尽管存在一些不确定性，需要进一步研究。
The present study aimed at determining the detection capabilities of an acoustic observation system to recognize porpoises under local riverine conditions and compare the results with sighting observations. Arrays of three to five acoustic data loggers were stationed across the main channel of the Tian-e-zhou Oxbow of China's Yangtze River at intervals of 100-150 m to record sonar signals of free-ranging finless porpoises (Neophocaena phocaenoides). Acoustic observations, concurrent with visual observations, were conducted at two occasions on 20-22 October 2003 and 17-19 October 2004. During a total of 42 h of observation, 316 finless porpoises were sighted and 7041 sonar signals were recorded by loggers. The acoustic data loggers recorded ultrasonic signals of porpoises clearly, and detected the presence of porpoises with a correct detection level of 77.6% and a false alarm level of 5.8% within an effective distance of 150 m. Results indicated that the stationed passive acoustic observation method was effective in detecting the presence of porpoises and showed potential in estimating the group size. A positive linear correlation between the number of recorded signals and the group size of sighted porpoises was indicated, although it is faced with some uncertainty and requires further investigation.