Detection of manatee feeding events by animal-borne underwater sound recorders
Detection of manatee feeding events by animal-borne underwater sound recorders
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DOI：
10.1017/s0025315413001343
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发表时间：
2014-09-01
影响因子：
1.2
通讯作者：
da Silva, Vera M. F.
中科院分区：
文献类型：
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作者：
Kikuchi, Mumi;Akamatsu, Tomonari;da Silva, Vera M. F.
研究水生物种在其自然环境中的摄食行为是困难的，因为直接观察几乎不可能。本研究利用自行研制的水声记录仪(AUSOMS-mini)，对圈养的亚马逊(Trichechus Inunguis)和安的列斯(Trichechus Manatus)海牛进行了摄食声音的直接记录。不同种类的水生植物被分别提供给海牛。喂食的声音是使用用matlab开发的定制程序自动提取的。与地面实况数据相比，该程序正确检测出65-79%的投喂事件，虚警率为7.3%或更低，这表明该方法是一种有用的海牛投喂事件记录方法。所有的海牛都在白天和夜间觅食。然而，海牛往往不那么活跃，夜间咀嚼的速度比白天慢。海牛咀嚼周期的持续时间取决于植物种类和个体。这个动物携带的声学监测系统可以提供准确的时间、持续时间和摄食事件的数量，以及潜在的被摄食植物物种，从而极大地增加我们对海牛觅食生态的了解。
Studies of the feeding behaviour of aquatic species in their natural environment are difficult, since direct observations are rarely possible. In this study, a newly developed animal-borne underwater sound recorder (AUSOMS-mini) was applied to captive Amazonian (Trichechus inunguis) and Antillean (Trichechus manatus manatus) manatees in order to directly record their feeding sounds. Different species of aquatic plants were offered to the manatees separately. Feeding sounds were automatically extracted using a custom program developed with MATLAB. Compared to ground truth data, the program correctly detected 65-79% of the feeding events, with a 7.3% or lower false alarm rate, which suggests that this methodology is a useful recorder of manatee feeding events. All manatees foraged during both the daytime and night-time. However, manatees tended to be less active and masticated slower during the night than during the day. The manatee mastication cycle duration depended on plant species and individual. This animal-borne acoustic monitoring system could greatly increase our knowledge of manatee feeding ecology by providing the exact time, duration and number of feeding events, and potentially the plant species being fed on.