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Prochlorococcus-like populations detected by flow cytometry in the fresh and brackish waters of the Changjiang Estuary

Published online by Cambridge University Press:  16 May 2007

X. Shang ,
L.H. Zhang  and
J. Zhang
X. Shang
Affiliation:
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 3663 Zhongshan Road North, Shanghai 200062, People's Republic of China
L.H. Zhang
Affiliation:
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 3663 Zhongshan Road North, Shanghai 200062, People's Republic of China
J. Zhang
Affiliation:
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 3663 Zhongshan Road North, Shanghai 200062, People's Republic of China College of Chemistry and Chemical Engineering, Ocean University of China, 5 Yushan Road, Qingdao 266003, People's Republic of China
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Abstract

Pico-size cells with a red fluorescence signature similar to marine free-living prochlorophytes have been detected by flow cytometry throughout the fresh and brackish waters of the Changjiang Estuary in August 2005. These cells could be discriminated from Synechococcus by their lack of orange (phycoerythrin) fluorescence, from Prochlorococcus by their larger side light scatter, and from picoeukaryotes by their smaller side light scatter and much lower red (chlorophyll) fluorescence. The maximum abundances of these Prochlorococcus-like particles reached 3×104 cells ml-1 in the low salinity zone upriver and declined rapidly seaward. While Synechococcus was scarce and Prochlorococcus vanished in the brackish regions, the Prochlorococcus-like cells overnumbered the picoeukaryotes and became the predominant pico-size auto- fluorescing particles there, implying they might play an important role in this estuarine ecosystem and worthy of further investigation.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 87 , Issue 3 , June 2007 , pp. 643 - 648
Copyright
2007 Marine Biological Association of the United Kingdom

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