生活史モデルによる海岸構造物のホッキガイ資源への影響評価

DOI 日本農学文献記事索引 Web Site 被引用文献1件 参考文献19件

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  • Impact Assessment of Coastal Structure Installation on the Stock of the Japanese Surf Clam (Spisula sachalinensis) using a Life Cycle Model
  • セイカツシ モデル ニ ヨル カイガン コウゾウブツ ノ ホッキガイ シゲン エ ノ エイキョウ ヒョウカ

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The relationship between distribution of juvenile Japanese surf clam Spisula sachaliensis and environmental factors in the neighboring area of nuclear power plant was investigated. Then a life cycle model of population dynamics incorporating the environmental factors was developed to evaluate the impact of the coastal structure installation on the stock of the surf clam. And a wave transport model was also developed to evaluate the effect of wave transport on the juvenile clam. Results of juvenile surveys show that the density of juvenile clam is higher around the breakwater. The mortality of the surf clam in shallow bottom and deeper offshore areas was affected by waves and the silt content respectively. Therefore a method was developed to estimate the mortality coefficient in terms of the Shields number. The life cycle model focuses on effect of the environmental factors such as current, silt content, Shields number and water temperature on survival and growth of the surf clam at various life stages. Results of the model show that the installation of coastal structures has an effect to reduce the mortality rate of juvenile clam, so that stock abundance of the clam increased accordingly. A wave transport model for the juvenile clam shows that clams tend to accumulate in the depth zone of 8 to 10 m under average wave condition. It suggests that optimal habitats of the surf clam result from the small mortality and effect of wave transport.

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