STUDY ON ENVIRONMENTAL FACTORS CONCERNING INSTABILITY OF MARINE ORGANISMS INHABITING ENVIRONMENT IN THE KASAI ARTIFICIAL BEACH

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  • 葛西人工海浜における生物生息環境の不安定化に係わる環境因子の検討
  • カサイ ジンコウ カイヒン ニ オケル セイブツ セイソク カンキョウ ノ フアンテイカ ニ カカワル カンキョウ インシ ノ ケントウ

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The values of dissolved oxygen, COD, Ignition Loss, Sulfide and Redox (Eh) in the Kasai artificial beach show almost same values as those of Banzu flats and Sanbanze, natural tidal flats in Chiba Prefecture.<br>However, the fluctuations in the biomass and species of the macrobenthos are so high that it cannot be considered a stable system. Those fluctuations are explained by factors such as the influx of river water. When the river water has been increased by rainfall, the water quality in Kasai artificial beach becomes a low salinity, and it was guessed that bivalves of Ruditapes phitippinarum, Mactra veneriformis, Mactra chinensis, etc. in the macrobenthos which are weak to the decrease of salinity, have been suffered big damage by low salinity.

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