日本富栄養化湖沼におけるMicrocystins濃度の空間的・時間的変化

概要

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The populations of Microcystis cells and the concentrations of a hepatotoxic group of compounds they produce, known as microcystins, were measured in 6 typical eutrophicated lakes in Japan to gain insight into spatial and temporal variations in microcystin production. The formation of water-bloom by the genus Microcystis was confirmed in all the surveyed lakes, and microcystins type LR, RR and YR were detected. In 5 of the 6 lakes, M. aeruginosa was the dominant species, but these 5 lakes were further classified into two groups according to the percentages of the three species of microcystins found inside M. aeruginosa cells. In Group 1, M. aeruginosa containing almost equal percentages of the three microcystins was detected, but in Group 2, Microcystis containing mainly type LR and RR and almost no type YR was detected. The content of microcystins in the cells varied between each lake, and also varied markedly during the summer season. In July and August, when the water temperature is high, almost all the microcystins in the lakes remained inside the cells. Only small amounts were eluted into the lake water.
生態工学会の論文