A multimodal detection model of dolphins to estimate abundance validated by field experiments
A multimodal detection model of dolphins to estimate abundance validated by field experiments
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DOI：
10.1121/1.4816554
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发表时间：
2013-09-01
影响因子：
2.4
通讯作者：
Sasaki-Yamamoto, Yukiko
中科院分区：
文献类型：
--
作者：
Akamatsu, Tomonari;Ura, Tamaki;Sasaki-Yamamoto, Yukiko
对海洋哺乳动物的粗略估计需要通过两种独立的手段对一种动物或一组动物的检测进行匹配。提出了一种多模态检测模型，使用视觉和听觉线索（浮出水面和发声），使丰富的估计海豚。该方法不需要特定的时间窗口来匹配应用标记-重捕获方法的两种手段的线索。该模型进行了评估，使用恒河海豚和伊洛瓦底江海豚，作为分散和浓缩的动物分布的例子，分别在现场观察获得的数据。无论动物在当前研究中心的分布如何，两种动物的声学检测概率约为80%，比目视检测概率高20%。恒河海豚和伊洛瓦底江海豚的丰度估计与以前的监测研究报告的数字相当一致。单个动物的检测概率小于较大的集群大小，如模型预测和现场数据证实。然而，密集的群体的伊洛瓦底江海豚集群大小的视觉和声学方法观察到的差异。该物种的单簇检测概率较低似乎是由于该物种的聚集分布造成的。2013年美国声学学会（Acoustical Society of America）
Abundance estimation of marine mammals requires matching of detection of an animal or a group of animal by two independent means. A multimodal detection model using visual and acoustic cues (surfacing and phonation) that enables abundance estimation of dolphins is proposed. The method does not require a specific time window to match the cues of both means for applying mark-recapture method. The proposed model was evaluated using data obtained in field observations of Ganges River dolphins and Irrawaddy dolphins, as examples of dispersed and condensed distributions of animals, respectively. The acoustic detection probability was approximately 80%, 20% higher than that of visual detection for both species, regardless of the distribution of the animals in present study sites. The abundance estimates of Ganges River dolphins and Irrawaddy dolphins fairly agreed with the numbers reported in previous monitoring studies. The single animal detection probability was smaller than that of larger cluster size, as predicted by the model and confirmed by field data. However, dense groups of Irrawaddy dolphins showed difference in cluster sizes observed by visual and acoustic methods. Lower detection probability of single clusters of this species seemed to be caused by the clumped distribution of this species. (C)2013 Acoustical Society of America.