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2006年10月在黄海冷水团海域的三个站点开展了微型异养鞭毛虫、异养细菌和蓝细菌的密度和生物量调查,进行了微型异养鞭毛虫的现场摄食实验,通过荧光标记细菌法和消化系数法获得该海区微型异养鞭毛虫对异养细菌和蓝细菌的摄食率,并估算了微型异养鞭毛虫对异养细菌和蓝细菌现存量及生产力的摄食压.结果显示,微型异养鞭毛虫、异养细菌和蓝细菌的密度分别为0.36×10~3～1.13×10~3,O.39×10~6～L 13×10~6和0.04×10~4～3.74×10~4cells/cm3,温跃层以上明显高于底层.微型异养鞭毛虫对异养细菌的摄食率为5.33～14.89个/(HF·h),对蓝细菌的摄食率为O.26×10~2～23.10×10~(-2)cells/(HF·h),摄食率随深度而下降.微型异养鞭毛虫每天能消耗9.27%～33.08%的异养细菌现存量和8.12%～16.09%的蓝细菌现存量.同时,微型异养鞭毛虫对异养细菌和蓝细菌的日摄食量各占它们生产力的2.66%～13.1O%和8.12%～16.09%.研究表明微型异养鞭毛虫的摄食可能不是秋季黄海冷水团海域浮游细菌及其生产力的主归宿.“,”Predation on bacteria and cyanobacteria(Synechococcus spp.) by heterotrophic nanoflagellate (HNF) were measured at three stations in the Huanghai Sea Cold Water Mass (HSCWM) area in October,2006. It was shown that the densities of HNF,bacteria and cyanobacteria were 0.36×10~3～1.13×10~3,0.39×10~6～1.13×10~6 and 0.04×10~4～3.74×10~4 cells/cm~3 respectively. Ingestion rate of heterotrophic bacteria,estimated on the basis of uptake of fluorescently labeled bacteria,varied from 5.33～14.89 (cell/HF·h）. The grazing rate on cyanobacteria was calculated from 0.26×10~(-2)to 23.10×10~(-2)cells/(HF·h）. HNF removed only 9.27%～33.08% of bacterial biomass and 2.66%～13.1% of bacterial production,while the consumption upon cyanobacteria was 8.12%～16.09% of the biomass and 8.12%～16.09% of the production,indicating that the consumption by HNF was unlikely responsible for the main fate of these two planktonic bacteria and their production in the HSCWM in autumn.