Detection probability of vocalizing dugongs during playback of conspecific calls.
Detection probability of vocalizing dugongs during playback of conspecific calls.
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DOI：
10.1121/1.3203805
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发表时间：
2009-10
期刊：
影响因子：
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通讯作者：
K. Ichikawa;T. Akamatsu;T. Shinke;Kotoe Sasamori;Yukio Miyauchi;Y. Abe;K. Adulyanukosol;N. Arai
中科院分区：
文献类型：
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作者：
K. Ichikawa;T. Akamatsu;T. Shinke;Kotoe Sasamori;Yukio Miyauchi;Y. Abe;K. Adulyanukosol;N. Arai
2008年1月，在泰国沃茨，使用同步被动声学方法和视觉观测对儒艮（儒艮）进行了监测。啁啾和颤音呼叫检测的拖曳立体声水听器阵列系统。两组经验丰富的观察员在同一艘船上进行标准的目视观察。计算了两个独立观察者之间的声学和视觉监测的检测概率的比较。声学和视觉检测概率分别为15.1%和15.7%，采用300秒的匹配时间间隔。当同种啁啾呼叫广播从水下扬声器部署在一侧的观测船，声学监测的检测概率上升到19.2%。视觉检测概率为12.5%。通过频散分析表明，以频繁的声音检测为特征的声音热点，而儒艮在整个焦点区域中不断地被视觉观察到（p<0.001）。被动声监测有助于调查，因为探测性能与有经验的视觉观察员相似。同种啁啾的播放似乎增加了检测概率，这可能是有益的，为未来的实地调查，使用被动声学，以确保儒艮出席的焦点区域。
Dugongs (Dugong dugon) were monitored using simultaneous passive acoustic methods and visual observations in Thai waters during January 2008. Chirp and trill calls were detected by a towed stereo hydrophone array system. Two teams of experienced observers conducted standard visual observations on the same boat. Comparisons of detection probabilities of acoustic and visual monitoring between two independent observers were calculated. Acoustic and visual detection probabilities were 15.1% and 15.7%, respectively, employing a 300 s matching time interval. When conspecific chirp calls were broadcast from an underwater speaker deployed on the side of the observation boat, the detection probability of acoustic monitoring rose to 19.2%. The visual detection probability was 12.5%. Vocal hot spots characterized by frequent acoustic detection of calls were suggested by dispersion analysis, while dugongs were visually observed constantly throughout the focal area (p<0.001). Passive acoustic monitoring assisted the survey since detection performance similar to that of experienced visual observers was shown. Playback of conspecific chirps appeared to increase the detection probability, which could be beneficial for future field surveys using passive acoustics in order to ensure the attendance of dugongs in the focal area.