PHYTOPLANKTON ASSEMBLAGES IN THE YANGTZE RIVER ESTUARY AND ITS ADJACENT WATER IN SUMMER,2006

Water samples for phytoplankton were investigated from the grid survey around the Yangtze River Estuary and its adjacent water on August 2006.Phytoplankton assemblages and cell abundance were reported in this paper.The main phytoplankton group was diatom and the second was dinoflagellate.There were also a few species belonging to Chrysophyceae,Chlorophyceae,and Cyanophyceae.The dominant species were Dactyliosolen fragilissima,and Skeletonema costatum.The cell abundance of phytoplankton ranged from 0.27 to 4830.09 cells·mL-1 and the average was 290.92 cells·mL-1.The larger cell abundance existed in the 122°30'E～123° area,the lower cell abundance existed in onshore.Meanwhile,phytoplankton cell abundance firstly increased and then rapidly reduced,the maximum cell abundance existed in subsurface water layer.According to the section distribution,in survey area cell abundance increased from seacoast to offshore,but the lowest cell abundance existed beside the wideside of survey area.