Picoplankton community structure at a coastal front region in the northern part of the South china sea

Abundances of picoplankton groups were determined by flow cytometry in the Northern South China Sea (SCS) in winter 2004 to study the dynamics of picoplankton at a coastal front region. Prochlorococcus is more abundant in relatively high temperature and salinity waters than in nearshore area. Heterotrophic bacteria dominate in total picoplanktonic biomass but keep rather stable in biomass and surface/bottom biomass ratio on both sides of the front. Increases of picophytoplanktonic biomass and their surface/bottom biomass ratio are remarkable mainly owing to the contribution of Synechococcus on the offshore open SCS waters. Temperature is found to limit the growth of Synechococcus and Prochlorococcus. Picoeukaryotes and heterotrophic bacteria are less sensitive to the change in hydrographic conditions across the front. The autotrophic/heterotrophic biomass ratio of picoplankton is lower in eutrophic coastal waters on the nearshore side relative to the offshore and oligotrophic open SCS.

[1]  Huijie Xue,et al.  Physical-Biological Oceanographic Coupling Influencing Phytoplankton and Primary Production in the South China Sea , 2004 .

[2]  R. Pingree,et al.  Coupling between physical and biological fields in the North Atlantic subtropical front southeast of the Azores , 1996 .

[3]  C. Courties,et al.  Autotrophic carbon assimilation and biomass from size-fractionated phytoplankton in the surface waters across the subtropical frontal zone (Indian Ocean) , 1999, Polar Biology.

[4]  Su Jilan,et al.  Overview of the South China Sea circulation and its influence on the coastal physical oceanography outside the Pearl River Estuary , 2004 .

[5]  D. Lindell,et al.  Ultraphytoplankton succession is triggered by deep winter mixing in the Gulf of Aqaba (Eilat), Red Sea , 1995 .

[6]  D. Vaulot,et al.  Enumeration of Phytoplankton, Bacteria, and Viruses in Marine Samples , 1999, Current protocols in cytometry.

[7]  G. Tarran,et al.  Picoplanktonic community structure on an Atlantic transect from 50°N to 50°S , 1998 .

[8]  P. Holligan,et al.  Physical controls on phytoplankton physiology and production at a shelf sea front: a fast repetition-rate fluorometer based field study , 2003 .

[9]  E. Kopczyńska,et al.  Phytoplankton variability in the Crozet Basin frontal zone (Southwest Indian Ocean) during austral summer , 2004 .

[10]  Steven E. Lohrenz,et al.  Transformation of Dissolved and Particulate Materials on Continental Shelves Influenced by Large Rivers: Plume Processes , 2004 .

[11]  G. Tarran,et al.  Microbial community structure and standing stocks in the NE Atlantic in June and July of 1996 , 2001 .

[12]  N. Guixa-Boixereu,et al.  Bacterioplankton and phytoplankton biomass and production during summer stratification in the northwestern Mediterranean Sea , 1999 .

[13]  J. Gasol,et al.  On-board flow cytometric observation of picoplankton community structure in the East China Sea during the fall of different years. , 2005, FEMS microbiology ecology.

[14]  William K. W. Li,et al.  Chlorophyll, bacteria and picophytoplankton in ecological provinces of the North Atlantic , 2001 .

[15]  T. Saino,et al.  Seasonal variability of picophytoplankton and bacteria in the western subarctic Pacific Ocean at station KNOT , 2002 .

[16]  Simon C Watkins,et al.  Current Protocols In Cytometry , 1997 .

[17]  Hongbin Liu,et al.  Picophytoplankton and bacterioplankton in the Mississippi River plume and its adjacent waters , 2004 .

[18]  J. Fuhrman,et al.  Relationships between Biovolume and Biomass of Naturally Derived Marine Bacterioplankton. , 1987, Applied and environmental microbiology.

[19]  A. Wilmotte,et al.  Molecular and pigment studies of the picophytoplankton in a region of the Southern Ocean (42–54°S, 141–144°E) in March 1998 , 2002 .