木曽川中流部におけるワンド環境の定量的評価と改善策の効果

抄録

In the midstream of the Kiso River wand, thick growth of trees is developed at river bed and river terrace, which declined habitat condition and its environment. The evident of decrease is observed in this region, e.g. Acheilognathus longipinnis (subfamily of Acheilognathinae). Therefore, it is an urgent need to improve the environment of the wand. This report describes quantitative evaluation of suitable wand environment for habitat of Acheilognathus longipinnis and summarizes its effectiveness. Three years after remedial measure of the wand is applied, good physical environment (i.e. sediment and mud thickness) is attained and the biological environment (i.e. bivalve populations) tends to improve. Monitoring results shows that the validity and effectiveness of quantitative evaluation and remedial measure of the wand have been confirmed.