, with the lowest value of 0.0878 observed in LH R, and the highest value of 2.18 in BLH L (Fig. S6a). The Pielou evenness exhibited a minimum value of 0.0353 in LH R. and a maximum value of 0.761 in AK R (Fig. S6b). Based on beta diversity analysis (Fig. S6c), the cyanobacterial communities could be categorized into three groups. Group I comprised three reservoirs from Zhuhai City (NP R., FHS R., and QW R.), while group II included QCS R., MY R., YQ R., LH R., and others. The remaining reservoirs were classified into group III.

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