首页|Factors related to aggravated Cylindrospermopsis (cyanobacteria) bloom following sediment dredging in an eutrophic shallow lake

Factors related to aggravated Cylindrospermopsis (cyanobacteria) bloom following sediment dredging in an eutrophic shallow lake

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In recent years,Cylindrospermopsis raciborskii blooms have been widely found worldwide.Topics dealing with the mitigation of C.raciborskii bloom is of great importance for toxins produced could threaten public health.The paper first investigated C.raciborskii dynamics over three years following sediment dredging in a shallow eutrophic Lake Dongqian (China).Based on rpoC1 gene copies,C.raciborskii bloom formed with average density of 1.30 × 106 cells/L on July 2009.One year later after sediment dredging,C.raciborskii cell density decreased below 1.17 × 105 cells/L or under detected limits during summer days on 2010.While two years later,the C.raciborskii bloom period was returned with markedly increased cell density reaching up to 4.15 × 107 cells/L on October 2011,and the maximum peak density was shown at 20.3 ℃ that was much lower than reported optimal growth temperature.Inferred from Spearman correlation analysis,linear regression showed C.raciborskii density was significant and positive with pH and SD,whereas they were significant and negative with TP and DO.Multiple regression analysis further demonstrated that TN,TP,SRP,pH and DO provided the best model and explained 53,1％ of the variance in C.raciborskii dynamics.The approaches managing nutrients reduction might not control C.raciborskii bloom as extremely low TN (avg.0.18 mg/L) and TP concentrations (avg.0.05 mg/L) resulted in the highest C.raciborskii cell density after sediment dredging.

Bloom controlCylindrospermopsisEnvironmental variablesSediment dredging

Xiaochuang Li、Shouliang Huo、Jingtian Zhang、Zhe Xiao、Beidou Xi、Renhui Li

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State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China

Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, 430072, PR China

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of Chinasupported this study.Great appreciations were contributed to Pro.Jiantong Liu for providing environmental variables data in the

2017YFA060500351922010917511144152100331700404

2020

环境科学与技术
湖北省环境科学研究院

环境科学与技术

CSTPCDCSCD北大核心
影响因子：0.943
ISSN：1003-6504
年,卷(期)：2020.2(4)
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