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タイトル: | Spatial distribution of dugongs by acoustic and visual observation in Thailand |
著者: | ICHIKAWA, KOTARO https://orcid.org/0000-0003-4377-7103 (unconfirmed) AKAMATSU, TOMONARI ARAI, NOBUAKI SHINKE, TOMIO ADULYANUKOSOL, KANJANA |
キーワード: | passive acoustical observation towed hydrophone system distribution pattern Iδ-index |
発行日: | Feb-2010 |
出版者: | Graduate school of Informatics, Kyoto University |
誌名: | Proceedings of the 5th International Symposium on SEASTAR2000 and Asian Bio-logging Science (The 9th SEASTAR2000 workshop) |
開始ページ: | 39 |
終了ページ: | 42 |
抄録: | Dugong calls were collected using a towed stereo hydrophone system around Talibong Island and Muk Island in Thailand in January 2008. Standard visual observation was conducted simultaneously to record the dugong distribution. A total of 223 dugong calls and 80 dugongs were detected. Spatial distributions of both of the acoustical and visual detections were analyzed using Iδ-index. The spatial distribution of the visual detections showed almost uniform distribution and that of the acoustical observations showed concentrated distribution (Iδ=0.85 and 3.18, respectively). The number of snapping noises per minute was less in the areas where dugong calls were observed (P < 0.001). It was suggested that dugongs vocalized selectively in less noisy areas. |
記述: | March 5-6, 2009, Bangkok, Thailand |
著作権等: | March 5-6, 2009, Bangkok, Thailand |
URI: | http://hdl.handle.net/2433/107338 |
出現コレクション: | Proceedings of the 5th International Symposium on SEASTAR2000 and Asian Bio-logging Science (The 9th SEASTAR2000 workshop) |
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