The development of teaching materials on the tidal river in environmental education

位于岛根县东部的Hii河流域的特点是河流穿过花岗岩地区，流域内有半咸水湖泊（新知湖和中海湖）以及自古以来与人类生活的深刻关系。以比伊河流域为例，本文从地球系统的角度，从环境素养的培养出发，探讨了环境教育的理想途径本研究的结果如下。(1)本文对新知湖底栖生物优势种日本蚬（Corbicula japonica）的循环问题进行了研究。观察了日本跳虫的摄食、消化和排泄情况，并对排泄物进行了分类。这些由假粪便、消化粪便和未消化粪便组成。日本蚬不仅是悬浮食性动物，也是碎屑食性动物。(2)本文对惠江流域的河床沉积物进行了研究。但是，从生态学角度进行综合环境调查一直是亟待解决的问题。(3)在此基础上，我们开发了一套适合初中生的环境教育新教材。(4)我们进行了工作坊和课堂研究，并与研究合作者进行了评估。

Hii River basin located in the eastern part of Shimane Prefecture is characterized by the rive running through granitic rock areas, the basin having the brackish lakes(Lake Shinji and Lake Nakaumi) and the deep relations with the human being life from ancient times.Using Hii River basin, the present authors has researched the ideal way of environmental education from the view point of earth system and from the nurture of environmental literacy that is suitable for the global ages.The results of this study are as follows.(1) We researched on the matter of cycle over Corbicula japonica that is the dominant species of the benthos in Lake Shinji. And observed the feeding, digestion and egestion of Colbicula japonica, and classified the excretary matters. These are composed of pseudo-feces, digested feces, and undigested feces. And, Corbicula japonica is not only suspension feeder but also detritus feeder.(2) The river bed sediments of Hii River basin ware investigated. But, the synthetic environment investigation from the view point of ecology was left as the problem to be solved.(3) On the basis of results of (1) and (2), we developed a new teaching materials of environmental education for the junior high school students.(4) We carried out the workshop and class research, and assessed with the research cooperators.