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Three-year changes in planktonic diatom communities in a eutrophic lake in Nanjing, Jiangsu Province, China

We determined the patterns in the annual succession of planktonic diatoms and the relationship between diatom seasonal succession and environmental variables in shallow, nutrient-rich Lake Yueya, which lies in Nanjing, Jiangsu Province, China. Planktonic diatoms and selected environmental parameter were examined monthly over 3 years. The diatom assemblages exhibited obvious seasonal succession in this lake. Cyclostephanos dubius and Stephanodiscus hantzschii were the dominant species in winter, representing a coolwater, eutrophic diatom assemblage. The dominant diatom species changed to Cyclotella atomus and Cyclotella meneghiniana in summer and autumn, which represent warmwater, eutrophic taxa. Loading of nutrients and temperature played important roles in the determination of diatom distribution and abundance based on the results of our canonical correspondence analysis.