An analysis of leading factors during Skeletonema costatum bloom occurring process in Shengshan sea area

The Shengshan Island is located at the edge of the Changjiang Delta shallow water shelf between the Changjiang Estuary and the Hangzhou Bay,that is,in the northeast(30°45'27"N,122°48'15" E) of the red tide area of the Changjiang Estuary,where red tides occur frequently.Being near middle latitudes,the adjacent waters of the island are subject to the ctommon impacts of the cold water mass of the Huanghai Sea in the north,the warm current from the outer sea in the southeast and the seasonal influx of the Changjiang River in the west,and thus the ecological environment is complex and changeable causing frequent red tide incidences.