諏訪湖における<i>Microcystis</i>種組成および藍藻毒素microcystin濃度に及ぼす硝酸態窒素・リン酸態リン濃度の影響

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タイトル別名
  • Influences of Nitrate and Phosphate Concentrations on <i>Microcystis</i> Species Composition and Microcystin Concentration in Lake Suwa
  • 諏訪湖におけるMicrocystis種組成および藍藻毒素microcystin濃度に及ぼす硝酸態窒素・リン酸態リン濃度の影響
  • スワコ ニ オケル Microcystisシュ ソセイ オヨビ ランソウ ドクソ microcystin ノウド ニ オヨボス ショウサンタイ チッソ リンサンタイ リン ノウド ノ エイキョウ

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Influences of nitrate and phosphate concentrations on Microcystis species composition and microcystin concentration were confirmed by the results of Lake Suwa investigation between June and October from 1992 to 2003. Phosphate concentration decreased gradually but nitrate concentration remained constant for 12 years. Nitrate : phosphate concentration ratio varied below 10 between 1992 and 1998, but was more than 10 after 1999. The changes in this ratio indicated that the Microcystis bloom limited factor shifted from nitrate to phosphate since 1999. From 1992 to 1998 under a nitrates-limited condition, toxic species (M. aeruginosa and M. viridis) dominated and a high microcystin concentration was detected. A nontoxic species, M. ichthyoblabe, dominated under a phosphate-limited condition and a low microcystin concentration was detected since 1999. These results suggested that the low phosphate concentration (blow 10μg L-1) shifted from toxic M. aeruginosa and M. viridis to nontoxic M. ichthyoblabe in the Microcystis blooms. Nitrate concentration affected the competition between M. aeruginosa and M. viridis.

収録刊行物

  • 水環境学会誌

    水環境学会誌 28 (6), 373-378, 2005

    公益社団法人 日本水環境学会

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