Influence of the Nature-Oriented Method on Aquatic Insects at the Flat Low Lands

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  • MATSUI Akira
    Doctoral Degree Program in Agricultural Sciences, University of Tsukuba
  • SATO Yohei
    Graduate School of Agricultural and Life Sciences, The University of Tokyo

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Other Title
  • 沖積低平地における多自然型河川整備が水生昆虫に及ぼす影響
  • チュウセキ テイヘイチ ニ オケル タシゼンガタ カセン セイビ ガ スイセイ コンチュウ ニ オヨボス エイキョウ ゴギョウガワ ミズギワセン チイキ ケイカク オ ジレイ ト シテ
  • In case of water's edge planning in Gogyou river basin
  • 五行川水際線地域計画を事例として

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Abstract

Recently, importance of river environment is getting recognized in Japan, so that river improvement taking river ecology into consideration, the nature-oriented method is one of which, is carried out. However, in present stage, relationships between habitat and living creatures are not clear. The purpose of this study is to make clear whether nature-oriented method distorts river ecology or not. Particularly, in this study, we evaluated physical environment and existence of aquatic insects around the nature-oriented bank and the concrete bank in a improved river (Gogyou river in Ibaraki Prefecture), based on those in a natural river (Kinu river in Tochigi Prefecture). As a result of comparing existence of aquatic insects around the nature-oriented bank with those around the concrete bank in Gogyou river, existence of aquatic insects around the concrete bank is more than those around the nature-oriented bank. One of the reasons is that the depth of water around the concrete bank is lower than those around the natureoriented bank. Consequently, to keep the depth of water shallow should be considered in river improvement on the flat low lands.

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