Abstract: [Objective] This study aimed to investigate the rotifer community structure and water environmental factors in Fujin National Wetland Park, and give a comprehensive evaluation for the water quality of this wetland park.[Method] Eleven sampling sites were established in Fujin National Wetland Park. We used the plankton nets to collect the samples in these sites from May to October in 2015 and then identified them under the microscope. Meanwhile we tested the physicochemical index of the wetland water. The biodiversity index and trophic state index were used to evaluate the water quality.[Result] The result showed that 37 rotifer species belonging to 16 genera were detected in Fujin National Wetland Park. The common dominant species in three seasons of Spring,Summer and Autumn were Brachionus calyciflorus, Lecane luna and Monostyia lunaris. The abundance and biomass of the rotifers varied in the range of 52-264 ind·L^-1 and 0.042 4-0.212 9 mg·L^-1 respectively. The diversity indexes of Shannon-Wiener, Margalef and Pielou were in the range of 1.698-3.262, 0.590-1.480, 0.583-0.927, respectively. The average trophic state index in Fujin National Wetland Park water was the highest in summer, and the lowest in spring. In the 11 sampling points, the highest trophic state index occoured at the No.7 sampling point where water enters the park from a ditch.The average trophic state index of the 11 points was 51.08.[Conclusion] From the analysis of the indicator species, the diversity index and the comprehensive index, it was concluded that the water quality was at a level of middle nutrition or slight eutrophication in Fujin National Wetland Park, 2015.

Key words: Fujin National Wetland Park, rotifer, community structure, water quality assessment