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論文投稿 GISを用いた過去の環境情報データの活用手法ーヒヌマイトトンボ幼虫の生息域とその保全に関する解析ー

作成年度 2012 年度
論文名 GISを用いた過去の環境情報データの活用手法ーヒヌマイトトンボ幼虫の生息域とその保全に関する解析ー
論文名(和訳)
論文副題
発表会 応用生態工学Vo.15 №1P19-29
誌名 (記載なし)
巻・号・回
発表年月日 2012/07/01
所属研究室/機関名 著者名(英名)
独立行政法人土木研究所水環境研究グループ自然共生研究センター大石哲也
国土交通省国土技術政策総合研究所環境研究部河川環境研究室天野邦彦
抄録
River environments must be managed appropriately if we are to take a strategic approach to river rehabilitation. For appropriate management we often need to use river enviromental information that was collected a long time ago. There is an increasing need for support systems to help us use this information, but most of the acquisition and recording of environmental information still depend on analog data or qualitative information, including photographs, maps, or the memories of elderly long-term inhabitants of the area. Meanwhile, the development of electronic information-gathering techniques has progressed rapidly in recent years. Environmental information is now being acquired digitally-for example, by the use of GPS to take positional information on living organisms or laser profiling to gather terrain information. We used both analog and digital date to establish a connection between environmental conditions-especially hydrological ones-and the presence of the native damselfly Mortonagrion hirosei Asahina and various plants. We found that the bulk of the larvae (57%) were present at points with cumulative inundation times of 1 to 500 h, 1% to 9% inundation probabilitites, and a Y.P. range of 0.2 to 0.6 m. Our resullts suggested that the best landform conditions for the exit of many larvae were based on the connectivity of water and soil flow with soil deposits by plants. Interestingly, the optimum ecological performance of the larvae differed from that of the populatiom of the common reed Phragmites australis. In planning to manage river environments, if we can utilize both analog date and digital GIS date appropriately then we will be able to predict adequately the influences on river ecosystems and apply this information to monitoring after river rehabilitation.
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