Community structure of phytoplankton and its relationship with aquatic environment factors in Jiantan Reservoir

Phytoplankton communities and 11 aquatic environmental factors were investigated from June to December in 2010,and the relationship between 54 phytoplankton species and 11 environmental factors was analyzed by canonical correspondence analysis( CCA). The results showed that a total of 103 species of phytoplankton were identified,which belonged to 7 phyla and 78 genera. Phytoplankton species in Jiantan Reservoir were mainly composed of Chlorophyta and Bacillariophyta. Phytoplankton abundance varied seasonally with the maximum value( 8. 04 ×106cells·L-1) in July and minimum( 2. 23×105cells·L-1) in December. Cyanobacteria and Chlorophyta dominated in summer,Cyanobacteria and Chlorophyta dominated in autumn,while Chlorophyta and Diatoms dominated in winter. The present state of eutrophication was more serious than that in the early stage of the reservoir,and more serious in summer than in winter. According to CCA,temperature and TP were the most important environmental factors affecting the distribution of phytoplankton in Jiantan Reservoir.