Effect of Chelating Substances on the Succession of Blue-Green Algae

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Determination of Algal Growth Potential (AGP) and limiting substances in Lake Kasumigaura were carried out from April 1999 to November 2001 using algal assay procedure. AGPs of filtrates using Microcystis aeruginosa were less than 2 mg/L. The growth of Microcystis, Anabaena, Phormidium were stimulated by the addition of EDTA or EDTA and nitrate. Oscillatoria was able to grow by the both addition of phosphorus and nitrogen without EDTA. It seems that chelate substance concentration was very important for the blue-green algal succession. Natural chelate substances such as fumic and fulvic acids isolated from Lake Kasumigaura sediment mitigated the heavy metal toxicity for the growth of Microcystis aeruginosa.