Microbial food webs in the East China Sea

各采样站微浮游生物生物量均大于纳米浮游生物生物量。自养型浮游生物和纳米浮游生物随深度的增加而减少，异养型浮游生物减少不明显。自养型微浮游生物与异养型纳米浮游生物具有显著的正相关关系，说明这两种浮游生物具有相同的有利环境特征。东海东部海域浮游生物总量略大于东部海域，同一海域微硅藻分布明显大于东部海域。总浮游生物的最大层数比叶绿素a的最大层数浅。裸细胞在鞭毛纲和纤毛纲中都占主导地位。在纤毛虫浮游生物中，表层以毛纤毛虫亚纲为主，尤其是少毛纤毛虫亚纲。这些纤毛虫随着深度的增加而减少，而其他亚纲纤毛虫在较深的层中占优势。在每一站的整个水柱中，隶属于有瓣的纤毛虫，丁丁亚目。一些纤毛虫被鉴定为种级，每个个体对盐度和温度表现出不同的发生模式。

Picoplankton biomass was larger than nanoplankton biomass in every sampling station. Autotrophic pico- and nanoplankton decreased with depth, while heterotrophic ones did not showed conspicuous decrease. Correlation between autotrophic picoplankton and heterotrophic nanoplankton was significantly positive and, therefore, these two plankters have the same characters for their favorable environments.Total microplankton biomass was slightly larger in the eastern side of East China Sea and partition of micro-diatom was distinctively larger in the same region. Maximum layer of total microplankton occurred shallower than that of chlorophyll a. Naked cells dominated in both dinoflagellate and ciliate groups.Among ciliate plankters, subclass Choreotrichia, especially, suborder Oligotrichina dominated in the surface layer. These ciliates decreased with depth and other subclass ciliates were dominant in the deeper layer. Loricated ciliate, suborder Tintinnina, was subordinated throughout the water column in every station. Some ciliates were identified into species level and each individual showed different occurrence pattern against salinity and temperature.