摘要
Seven surveys were carried out in April, September, October, December 2006 and March, May, August 2007 in the Yellow Sea, China. Variations in the spatial and temporal distribution of Synechococcus, picoeukaryotes and heterotrophic bacteria are quantified using flow cytometry. Synechococcus and heterotrophic bacteria are most abundant from late spring to autumn, while picoeukaryotes concentration is high in spring. Synechococcus and heterotrophic bacteria concentrated high in the northwest part of the Yellow Sea in spring and autumn, while picoeukaryotes distributed evenly over the whole study area except for a small frontal zone in the coastal area on the west （in spring） and central Yellow Sea （in autumn）. Under mixing conditions, the vertical distribution of the three picoplankton groups showed a well-mixed pattern. Upon a well-established stratification, the maximum abundance of picoplankton occurred above the mixed layer depth （-30 m）. Cell sizes of Synechococcus and picoeukaryotes were estimated by converting forward scatter signals （FSC） from cytometry analysis to cell diameter, showing the results of 0.65-0.82 um for Synechococcus and 0.85-1.08 um for picoeukaryotes. The average integrated carbon biomasses ranged 15.26-312.62 mgC/m2 for Synechococcus, 18.54-51.57 mgC/m2 for picoeukaryotes, and 402.63-818.46 mgC/m2 for heterotrophic bacteria. The distribution of Synechococcus and heterotrophic bacteria was temperature dependent, and picoplankton presence was poor in the Yellow Sea Cold Water Mass.
七调查在 4 月， 9 月， 10 月， 2006 年 12 月和三月被执行， 5 月，在黄海的 2007 年 8 月，中国。在 Synechococcus， picoeukaryotes 和不是自养的细菌的空间、时间的分发的变化用流动 cytometry 被确定。Synechococcus 和不是自养的细菌从迟了的春天是很丰富的到秋天，当 picoeukaryotes 集中在春天高时。Synechococcus 和不是自养的细菌在春天和秋天在黄海的西北部分高专注，当 picoeukaryotes 在西方上在沿海的区域除了一个小正面的地区在整个学习区域上均匀地散布了时(在春天) 并且中央黄海(在里面秋天) 。在混合条件下面，三个 picoplankton 组的垂直分发显示出一个混合得好的模式。在生长得很好的层化之上，最大的许多 picoplankton 发生在混合的层深度(30 m ) 上面。Synechococcus 和 picoeukaryotes 的房间尺寸被向前变换估计从 cytometry 分析散布信号(FSC ) 到房间直径，为 picoeukaryotes 为 Synechococcus 和 0.851.08 m 显示出 0.650.82 m 的结果。平均的综合的碳 biomasses 变化了为 Synechococcus，为 picoeukaryotes 的 18.5461.57 mgC/m2，和为不是自养的细菌的 402.63818.46 mgC/m2 的 15.26312.62 mgC/m2。Synechococcus 和不是自养的细菌的分发是温度依赖者，并且 picoplankton 存在在黄海冷水团中是差的。
基金
Supported by the National Basic Research Program of China (973 Program) (No.2011CB409804)
the National High Technology Research and Development Program of China (863 Program) (No.2007AA09Z434)
the Knowledge Innovation Project,CAS (KZCX2-YW-213-3)
