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

Toxins
Lili HuLirong Song

Abstract

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.

References

Jul 1, 1997·International Journal of Systematic Bacteriology·B A NeilanA E Goodman
Nov 7, 2003·Applied and Environmental Microbiology·Rainer Kurmayer, Thomas Kutzenberger
May 19, 2006·International Journal of Environmental Research and Public Health·Ian R Falconer, Andrew R Humpage
Jun 16, 2006·FEMS Microbiology Reviews·Martin Welker, Hans von Döhren
Oct 10, 2006·Journal of Bioscience and Bioengineering·Kazuhiro FurukawaYuhei Inamori
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Jul 18, 2009·Environmental Toxicology·William OkelloRainer Kurmayer
Jan 15, 2014·Applied and Environmental Microbiology·Lin ZhuNanqin Gan

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Citations

Sep 25, 2017·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Xiaobin HuChenglong Wu
Feb 18, 2017·Toxins·Miquel LürlingElisabeth Faassen
Mar 7, 2020·Toxicon : Official Journal of the International Society on Toxinology·Rosa María Pineda-MendozaGerardo Zúñiga
Sep 1, 2018·Environmental Science & Technology·Xiangming TangSteven W Wilhelm

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Methods Mentioned

BETA
PCR
PCA

Software Mentioned

CANOCO
SPSS

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