Seasonal variation characteristics of microcystins in the key reservoirs of Eastern Guangdong
In order to understand the seasonal variation characteristics of Microcystins and its driving variables in the reservoirs of Eastern Guangdong,investigation and research were carried out on 20 key reservoirs for two consec-utive years.The results showed the phytoplankton community structure was composed of Cyanophyta mainly;the av-erage abundance values for various seasons were variable within 7812～21515 cells/mL,of which MCs only ac-counted for a low proportion of 373～1156 cells/mL and had no significant difference in different seasons;the con-centration of MCs in water was generally at a relatively low level and variable within 0.05～0.33 μg/L;the concen-trations of MCs in spring and autumn had no significant difference,but the concentrations of MCs in winter and sum-mer were significantly higher and lower respectively.The results of correlation analysis demonstrate the concentra-tion of MCs in water was significantly positively correlated to the abundance of cyanobacteria producing MCs and significantly negatively correlated to water temperature.
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