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JPR Advance Access published online on December 23, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi117
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received September 29, 2005
Accepted December 20, 2005

Article

Picoplankton Community Structure at a Coastal Front Region in the Northern Part of the South China Sea

L.A. Pan 1 *, J. Zhang 2, Q. Chen 3, and B. Deng 4

1 State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 3663 Zhongshan Road North, Shanghai 200062, P. R. China; EIA Department, Shanghai Academy of Environmental Sciences, 508 Qinzhou Road, Shanghai 200233, P. R. China
2 State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 3663 Zhongshan Road North, Shanghai 200062, P. R. China; College of Chemistry and Chemical Engineering, Ocean University of China, 5 Yushan Road, Qingdao 266003, P.R. China
3 Laboratory of Ocean Dynamic Processes and Satellite Oceanography, Second Institute of Oceanography, State Oceanic Administration, Xixihexia No. 9, Hangzhou 310012, P. R. China
4 State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 3663 Zhongshan Road North, Shanghai 200062, P. R. China

* To whom correspondence should be addressed.
L.A. Pan, E-mail: panluoan{at}163.com


  Abstract

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 South China Sea 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 South China Sea.

Communicating Editor: KJ Flynn


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