Dynamics of picoplankton in the Nansha Islands area of the South China Sea

作     者：YANGYanhui JIAONianzhi YANG Yanhui, JIAO NianzhiKey Laboratory for Marine Environmental Science of the Ministry of Education, Environmental Science Research Center, Xiamen University, Xiamen 361005, China

作者机构：KeyLaboratoryforMarineEnvironmentalScienceoftheMinistryofEducationEnvironmentalScienceResearchCenterXiamenUniversityXiamen361005China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2004年第23卷第3期

页      面：493-504页

核心收录：

学科分类：0710[理学-生物学] 1007[医学-药学(可授医学、理学学位)] 100705[医学-微生物与生化药学] 07[理学] 0707[理学-海洋科学] 071005[理学-微生物学] 10[医学] 

主　　题：Synechococcus Prochlorococcus pico-eukaryotes heterotrophic bacteria Nansha Islands area South China Sea 

摘      要：Dynamics of major picoplankton groups, Synechococcus (Syn), Prochlorococcus (Pro), picoeukaryotes (Euk) and heterotrophic bacteria (Bact) was investigated by flow cytometry for the first time in the Nansha Islands area in the South China Sea. Averaged over the whole investigation area, depth-weighted integrated cell abundance (DWA) of Syn, Pro, Euk and Bact was 1.6 (0.4-5.7)×103, 5.4 (0.1-7.3)×104, 0.7 (0.2-2.2)×103, and 2.3 (1.4-3.2)×105 cells/mL respectively. Picoautotrophic cell abundance was low in the northwest part of the Nansha Islands where surface water temperature was low and the upper mixed layer was shallow. Concurrently, a surface maximum vertical distribution pattern was observed in this area. While in the southeast and east zones where temperatures were relatively higher and nitraclines were deeper, picoplankton is abundant and a subsurface maximum around 50-75 m is observed. Coupling of horizontal and vertical distribution patterns of picoplankton abundance and hydrological status was found, suggesting a strong influence of currents and water column structure on picoplankton distribution in the investigation area. Contrary to that in the shelf water in the East China Sea, the relationship between Pro and Bact in the Nansha Islands area in the South China Sea was not significantly negative but weakly positive. Moreover, a similar distribution pattern of Syn and Pro was observed. Possible reasons for these differences in the two marine regimes were discussed.