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Toxins 2016, 8(1), 23;

Multi-Year Assessment of Toxic Genotypes and Microcystin Concentration in Northern Lake Taihu, China

State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
University of Chinese Academy of Sciences, Beijing 100049, China
Institute of Electronic Information Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
Changzhou Environmental Monitoring Center, Changzhou 213001, China
Author to whom correspondence should be addressed.
Academic Editor: Luis M. Botana
Received: 13 August 2015 / Revised: 7 December 2015 / Accepted: 8 January 2016 / Published: 15 January 2016
(This article belongs to the Collection Marine and Freshwater Toxins)
PDF [1257 KB, uploaded 15 January 2016]


Lake Taihu is the third-largest freshwater lake in China and has been suffering from cyanobacterial blooms for over two decades. The northern part of the lake, Meiliang Bay, is known to be at high risk of dense and sustained Microcystis blooms and toxins. This study aimed to investigate and record the annual and seasonal dynamics of toxic genotype, Microcystis morphospecies succession and microcystin variation. It also aimed to find out the underlying driving factors influencing the dynamic changes. Microcystin (MC) and the Microcystis genotype were quantified using HPLC and quantitative real-time PCR, respectively. Our study, over three consecutive years, showed that the pattern of morphospecies succession was seasonally distinct and annually consistent. During the same period in 2012, 2013 and 2014, the average MC were, on dry weight basis, 733 μg·g−1, 844 μg·g−1, 870 μg·g−1, respectively. The proportion of toxic Microcystis accounted for 41%, 44% and 52%, respectively. Cell bound microcystin was found to correlate with the percentage of toxic Microcystis. Based on historical and current data, we conclude that annual bloom toxicity was relatively stable or possibly increased over the last decade. View Full-Text
Keywords: Microcystis morphospecies; microcystins; qPCR; nitrogen; Lake Taihu Microcystis morphospecies; microcystins; qPCR; nitrogen; Lake Taihu

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Hu, L.; Shan, K.; Lin, L.; Shen, W.; Huang, L.; Gan, N.; Song, L. Multi-Year Assessment of Toxic Genotypes and Microcystin Concentration in Northern Lake Taihu, China. Toxins 2016, 8, 23.

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