THE VARIATION OF PICOPLANKTON DURING THE SPRING BLOOM IN THE YELLOW SEA, CHINA
黄海春季水华过程中微微型浮游生物的变化特点

Temporal variability of Synechococcus, picoeukaryotes and heterotrophic bacteria biomass during the three spring blooms in 2007 were investigated in the Yellow Sea, China by flow cytometry. Synechococcus and picoeukaryotes biomass were highest during pre-bloom, and decreased sharply during bloom period. Heterotrophic bacteria biomass varied less severely during the cruise, with highest biomass in bloom period. Synechococcus and picoeukaryotes showed an opposite trend with water chl a variation, while heterotrophic bacteria had a positive co-relation with chl a. Ciliates and heterotrophic nanoflagellates grazing were the possible cause of the decrease in Synechococcus and picoeukaryotes biomass during spring bloom.