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On-line Access: 2012-04-06

Received: 2011-07-25

Revision Accepted: 2011-10-27

Crosschecked: 2012-02-27

Cited: 11

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Journal of Zhejiang University SCIENCE A 2012 Vol.13 No.4 P.311-322


Environmental factors regulating cyanobacteria dominance and microcystin production in a subtropical lake within the Taihu watershed, China

Author(s):  Wan-min Ni, Jian-ying Zhang, Teng-da Ding, R. Jan Stevenson, Yin-mei Zhu

Affiliation(s):  Institute of Environmental Science, Zhejiang University, Hangzhou 310058, China; more

Corresponding email(s):   nwm1225@yahoo.com.cn, zjy@zju.edu.cn

Key Words:  Cyanobacteria, Microcystins, Eutrophication, Water quality, Taihu watershed

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Wan-min Ni, Jian-ying Zhang, Teng-da Ding, R. Jan Stevenson, Yin-mei Zhu. Environmental factors regulating cyanobacteria dominance and microcystin production in a subtropical lake within the Taihu watershed, China[J]. Journal of Zhejiang University Science A, 2012, 13(4): 311-322.

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author="Wan-min Ni, Jian-ying Zhang, Teng-da Ding, R. Jan Stevenson, Yin-mei Zhu",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Environmental factors regulating cyanobacteria dominance and microcystin production in a subtropical lake within the Taihu watershed, China
%A Wan-min Ni
%A Jian-ying Zhang
%A Teng-da Ding
%A R. Jan Stevenson
%A Yin-mei Zhu
%J Journal of Zhejiang University SCIENCE A
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%D 2012
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1100197

T1 - Environmental factors regulating cyanobacteria dominance and microcystin production in a subtropical lake within the Taihu watershed, China
A1 - Wan-min Ni
A1 - Jian-ying Zhang
A1 - Teng-da Ding
A1 - R. Jan Stevenson
A1 - Yin-mei Zhu
J0 - Journal of Zhejiang University Science A
VL - 13
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SP - 311
EP - 322
%@ 1673-565X
Y1 - 2012
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1100197

Understanding the pattern of phytoplankton and their dependence on water quality variables, can help the management of eutrophic lakes. The aim of this study was to determine water quality and environmental factors associated with cyanobacteria dominance and microcystin production in Qingshan Lake, a subtropical lake located in the headwater of the taihu watershed, China. Water samples collected monthly from 10 study sites in Qingshan Lake were analyzed for the species distributions of freshwater algae and physico-chemical parameters including total nitrogen (TN), ammonia (NH4+-N), nitrate (NO3-N), total phosphorus (TP), and chlorophyll a (Chl-a) from June, 2008 to May, 2009. Qingshan Lake was found to be eutrophic, based on the calculated trophic state index (TSI). The average TN of 4.33 mg/L during the study period exceeded the Surface water quality Standards of China. TP was significantly correlated with relative abundance of cyanobacteria and Microcystis biovolume, indicating its important role in regulating cyanobacteria. Microcystis, Anabaena, and Oscillatoria were dominant cyanobacteria in Qingshan Lake from June to November, 2008. cyanobacteria dominance was regulated by water temperature and TP. Principal component analysis further indicated that microcystin production was most affected by water temperature, TP, and cyanobacteria biomass. Results suggest that the control of TP in summer can mitigate cyanobacteria dominance and microcystin production in Qingshan Lake, and close monitoring should be undertaken in summer.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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