海岸侵食に伴って形成される海底環境が底生動物と底生魚類に与える影響

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  • The Influence of Demersal Habitat Structure Formed with Coastal Erosion on Macrobenthos and Demersal Fishes
  • ベチバーアブラ ノ キハツ セイブン フェノール ユウドウタイ ノ ドウテイ

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We investigated the influence of coastal erosion on macrobenthos and demersal fishes in Miho coast, Japan. The coastal erosion in this area has been observed since 1983. In this study, it was shown that strong sediment flow on the sea floorwas formed with long-term coastal erosion. Furhermore, it was suggested the generation of consecutive sediment flow brought movement of bottom of the sea soil in 25m water depth where the change of geographical features was not observed, and the specific demersal environment was difficult to form particulate organic matters. It is not only few food of macrobenthos that available, but also the fragile of habitats at the sea bottom, a place of primary succession, was occured. As a result, macrobenthic fauna was poorly build-up. In addition to, it was suggested that The richness of demersal fishes as macrobenthic feeder was decreased due to the decay of food resource that influences the initial growth and the reproduction of demersal fishes.

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