諏訪湖における藍藻の現存量・種組成変化に及ぼす滞留時間の影響 [in Japanese] Effects of Retention Time on Biomass and Species Composition of Blue-Green Algae in Lake Suwa [in Japanese]
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We carried out research in Lake Suwa from 2004 to 2008 to study how retention time affects the biomass and species composition of blue-green algae. The retention time of the lake ranged from 2.3 (rainy season in July 2006) to 120 (dry season in June 2005) days. <I>Microcystis</I> was predominant in summer, but <I>Aphanizomenon</I> was predominant in 2005 and 2006. Owing to nitrogen deficiency, the <I>Microcystis</I> population increase was suppressed when retention time was kept at more than 80 days. The increase in the population of <I>Aphanizomenon flos-aquae</I> was suppressed probably owing to the dilution and discharge of cells by precipitation, and the change of the predominant species caused by nutrient inflow. In this paper, we suggest an appropriate retention time for respective blue-green algae on the basis of changes in the predominant species caused by changes in retention time.
- Journal of Japan Society on Water Environment
Journal of Japan Society on Water Environment 33(9), 123-129, 2010
Japan Society on Water Environment