Abstract
These days, protection works that is intended to works as pupation place for fireflies are popular in Yamaguchi prefecture. Although a lot of such works have already been constructed, some of them have succeeded and others have failed. Follow-up survey to check the reason of success or failure of the works has not conducted yet. In this study, we conducted field surveys to investigate how fireflies utilize bank protection works in Ichinosaka River, Yoshiki River and Sawanami River.
Firstly, we tracked the climbing larvae from April to May and checked out the pupation place. Next, we established nets on the banks of the rivers from May to June and counted the number of emergence of firefly adults. From those surveys, we found that not only bank slopes but also flood planes were utilized as pupation place by fireflies. Not only the banks themselves but also lighting condition, current velocity, height of the beds and the maintenance program for those facilities were found to be important.
