The evaluation of environmental quality of a brackish lake in subarctic zone (Lake Furen, Japan) toward the reconstruction of Corbicula japonica fishery

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  • 亜寒帯汽水湖（風蓮湖）におけるシジミ漁業の再構築を見据えた水質・底質環境の現状評価
  • アカンタイ キスイコ(カゼ レンコ)ニ オケル シジミ ギョギョウ ノ サイコウチク オ ミスエタ スイシツ ・ テイシツ カンキョウ ノ ゲンジョウ ヒョウカ

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Abstract

We had monitored water and sediment properties of a brackish lake in subarctic zone (Lake Furen, Japan) from 2011 through 2013. In mesohaline water (salinity: 15～ 20), phytoplankton proliferated vigorously (annual median Chl.a:3.3～13 μg/L, Chl.a standing stock: ～130 mg/m2), with rich nutrients loaded thorough rivers. As for surface sediment, we ascertained Chl.a standing stock to be markedly rich (～950 mg/m2). Phytoplankton and microphytobenthos are considered to act as effective food source for Corbicula japonica. On the other hand, sediment condition remained harmful to benthos. Annual average TOC content reached 33～39±25～31 S.D.mg/g, with AVS-S being more than 2.5 mg/g, especially near river mouth. We concluded that physicochemical properties of surface sediment, formed by allochthonous inputs, should be improved toward the reconstruction of Corbicula japonica fishery.

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  • 低温科学

    低温科学 74 21-30, 2016-03-31

    低温科学第74巻編集委員会

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