Functional Evaluation of Landscape Elements of Urban Green Park using Red Claws Crab (<i>Chiromancers haematocheir</i>) as Environmental Indicator

  • Inai Sachiyo
    Graduate School of Advanced Technology and Science, The University of Tokushima
  • Shinomiya Ryuji
    Department of Civil and Environmental Engineering, The University of Tokushima
  • Kawaguchi Yoichi
    Institute of Technology and Science, The University of Tokushima
  • Kamada Mahito
    Institute of Technology and Science, The University of Tokushima

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Other Title
  • アカテガニを指標とした都市公園緑地の景観構成要素の機能評価
  • アカテガニ オ シヒョウ ト シタ トシ コウエン リョクチ ノ ケイカン コウセイ ヨウソ ノ キノウ ヒョウカ

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Abstract

Red Claw Crab (Chiromancers haematocheir) requires a different habitat in each stage of their life cycle; estuary area at larval stage before metamorphosis, then forest during maturing and matured stages. Using this crab as an ecological indicator, suitability of landscape element types in urban park as wildlife habitat was evaluated. Results showed; 1) spaces in and along an artificial stream were favored by the crab, which were located along a forest edge, while bare ground was disfavored, 2) in the forest, holes of stonewall were selectively used, 3) in the artificial stream, areas shaded by planted grasses and stones were preferred, and 4) at a time for larva spawning, a place with an old type stonewall, which has many large holes and vegetation, was selectively used. Water supply by the artificial stream and climate mitigation by the forest were essential functions for supporting the life of these crabs. Even in manmade structures for amenity, such as stream, stonewall, planted grasses and rocks, they successfully make use of such habitats. Therefore, it is evident that manmade structures can be designed multi-functionally for satisfying demands as habitat for wildlife and for the amenity of urban dwellers.

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