A study on the evaluation method for small watershed by the relationship between the combination of biotope types and habitation of frogs

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  • ビオトープタイプの組成とカエル類生息からみた小流域の評価手法に関する研究

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This paper proposes an environmental evaluation method in units of small watershed in order to discuss the guideline for the landscape management considering the conservation and restoration of the local biodiversity on scale of city or district. The Survey area is Kamakura city and the evaluation species are two frog species; Rana ornativentris and Rhacophorus schlegelii. The combination of biotope types is one of the important factors in the habitat environment. Firstly, biotope types were classified as habitat of each evaluation species for the breeding and non-breeding season based on the biotope map of Kamakura city. The combination of the biotope types of each small watershed were evaluated as the habitat potentiality. The correspondence of evaluation results to actual habitats validated the evaluation method. Secondly, the small watersheds were classified into six types of environmental character by cluster analysis using indices of the land features and land cover. Furthermore, to combine the environmental characteristics with the evaluation result clarified the environmental potential of each small watershed type as habitat of evaluation species.

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