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

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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.