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JPR Advance Access originally published online on January 19, 2007
Journal of Plankton Research 2007 29(2):187-197; doi:10.1093/plankt/fbm006
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Picophytoplankton, nanophytoplankton, heterotrohpic bacteria and viruses in the Changjiang Estuary and adjacent coastal waters

L. A. Pan1,2,*, J. Zhang1,3 and L. H. Zhang1

1 State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 3663 Zhongshan Road North, Shanghai 200062, People's Republic of China 2 EIA Department, Shanghai Academy of Environmental Sciences, 508 Qinzhou Road, Shanghai 200233, People's Republic of China 3 College of Chemistry and Chemical Engineering, Ocean University of China, 5 Yushan Road, Qingdao 266003, People's Republic of China

* Corresponding Author: panluoan{at}163.com

Received on November 6, 2006; accepted on December 4, 2006


  Abstract

Flow cytometry (FCM) was used to examine the abundances and distributions of different picophytoplankton groups (i.e. Synechococcus, Prochlorococcus and picoeukaryotes), nanophytoplankton, heterotrophic bacteria and viruses were examined in the Changjiang Estuary, China and adjacent coastal waters during autumn 2004. Water temperature and light availability were found to be critical factors for picophytoplankton growth. Positive correlations were found between picophytoplankton, heterotrophic bacteria and viruses, and a seaward-increasing trend in the V-I (the group yielding high green fluorescence according to FCM) population within viruses was detected. The importance of nanophytoplankton is progressively usurped by picophytoplankton with increasing distance offshore. Picoeukaryotes are the most successful group among picophytoplankton in near-shore eutrophic waters, whereas Prochlorococcus surpasses other groups within the pico- and nanophytoplankton community in offshore oligotrophic regions of the East China Sea Shelf.

Communicating editor: K.J. Flynn


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