Distribution of sika deer, its impact on vegetation and their management in Oze

尾瀬地域はニホンジカの影響を受けずに成立した生態系と考えられているが，1990年代からシカによる湿原植物の採食被害や掘り返しなどの攪乱被害が報告されており，湿原や森林生態系への不可逆的な影響が懸念されている．環境省では，尾瀬内でのモニタリング調査として，GPS首輪によるシカの行動調査，ライトセンサス調査，採食痕跡調査および裸地の空撮を実施している．また，モニタリング結果を踏まえた対策として，国立公園内でのシカ捕獲および植生保護柵の設置を行っている．対策を講じている一方，近年の調査結果によれば，個体数は増加傾向であり，採食被害の拡大が報告されていることから，より効果的な対策が求められている．Ecosystem in Oze had been established without sika deer's effect. Since sika deer inhabitation was reported even in Oze in the mid-1990s, disturbance of vegetation including marsh has become prominent, and it is concerned that they might have the irreparable impact on the original ecosystem. Ministry of the Environment have conducted the survey of sika deer in Oze such as tracking deer with GPS collar, spotlight count, investigating vegetation damage further measuring the area of the bare ground. Considering the result of survey, we have attempted culling deer around marsh and constructing fence for protecting endangered plants. However, according to recent survey, the number of sika deer trends upward and the damage of vegetation expanding while we've tried some countermeasures. Because of that, effective strategies to suppress the impact are required