熊本県境川におけるタナゴ亜科の生息場評価とこれに配慮した河川改修案の提案

抄録

Rhodeus ocellatus kurumeus and Acheilognathus tabira nakamurae have been designated as an endangered species inhabit in the Sakai river, Kumamoto Pref.. In addition, there are all native species have been confirmed in Kyushu. However, the river improvement is planned, it is concerned about the influence on bitterlings and the clams. In this study, we evaluated quantitatively the habitat of bitterling fry for planning the river improvement plan in consideration for a bitterling fry. In addition, based on these result, we evaluated and predicted the appearance probability of bitterling fry. As a result, the appearance probability of bitterling fry decreased in short-cut in river improvement plan than meandering of the current, it is not suitable as habitats of bitterling fry.