Development of cost-saving techniques to detect the newly expanding sika deer populations ―Working Group for Tohoku Wildlife Management―


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  • 分布拡大初期にあるシカ個体群の低コストモニタリング手法の開発 ―東北野生動物管理研究交流会―


<p>It is now required that precautionary measures against expanding populations of sika deer (Cervus nippon) in the Tohoku district including heavy snow areas. Then we have devised the new monitoring method, named “voice traps,” to detect deer in areas with their low-density population, where the existing monitoring methods (e.g., spotlight counts, camera traps) are rarely effective. Here we conducted the verification tests of the voice traps in eastern Japan. The voice traps for deer are composed of two different monitoring methods; active acoustic monitoring (AAM) and passive acoustic monitoring (PAM). While the AAM is a type of sound playback survey through using the behavioral trait of male deer in rut seasons, the PAM relies on the detection of loud calls (i.e., howl and moan) spontaneously emitted by male deer with autonomous recording units and machine learning algorithm. We conducted seven evaluation tests for the AAM in six study areas and confirmed clear howl-back in the two areas (Nasu area and Asahi-Iide mountains). We then tested the PAM in five study areas and automatically detected howl sounds in two areas (Nasu area and Asahi mountains). Considering that the habitat occupation of deer was hardly confirmed by the existing monitoring methods in these study areas, the current verification tests demonstrated the higher detectability of the voice traps.</p>



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