Abstract: To elucidate the spatiotemporal distribution characteristics and water environmental influencing factors of zooplankton community structure in the Xuancheng section of the Shuiyang River, non-metric multidimensional scaling (NMDS) was applied to analyze the succession law of zooplankton communities and redundancy analysis (RDA) was used to investigate the correlation between zooplankton distribution and water environmental factors. Zooplankton surveys were conducted at 12 sampling points in the Xuancheng section of the Shuiyang River in August and November 2022, March and June 2023, respectively. The results showed that a total of 151 species of zooplankton in 4 categories were detected, mainly rotifera. The number of species was the highest in June and the lowest in March, and the number of species in the middle and lower reaches of the river was higher than that in the upper reaches. There were 16 dominant species, mainly Protozoa and Rotifera, and there were multiple indicator species of eutrophication in water bodies. There were temporal and spatial differences in zooplankton stock and diversity indexH′, JandD. The structure of zooplankton community showed certain differences and consistency in time and space. In August, zooplankton were greatly affected by NO－3-N and TN, NO－3-N, NH+4-N and DO in November, WT in March, COD, NO－3-N, pH and PO3－4-P in June. On the whole, the water body in the study area has been eutrophicated, which is α —medium pollution.

Key words: Xuancheng section of Shuiyang River, zooplankton, community structure, environmental factor