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JPR Advance Access originally published online on October 12, 2006
Journal of Plankton Research 2007 29(1):71-77; doi:10.1093/plankt/fbl058
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© The Author 2006. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Pigmented nanoflagellates in the coastal western subtropical Pacific are important grazers on Synechococcus populations

An-Yi Tsai1, Kuo-Ping Chiang1,2,*, Ya-Fan Chan1, Yun-Chi Lin1 and Jeng Chang2,3

1 Institute of Environmental Biology and Fishery Science, National Taiwan Ocean University, Keelung 202-24, Taiwan 2 Institute of Marine Environmental Chemistry and Ecology, National Taiwan Ocean University, Keelung 202-24, Taiwan 3 Institute of Marine Biology, National Taiwan Ocean University, Keelung 202-24, Taiwan

* Corresponding Author: kpchiang{at}mail.ntou.edu.tw

Received on April 5, 2006; accepted on October 6, 2006


  Abstract

Although the key grazers on Synechococcus and other planktonic marine bacteria are generally thought to be nanoflagellates (both non-pigmented and pigmented) as well as ciliates, we previously found in our western subtropical Pacific coastal study site that ciliates exerted almost no grazing pressure. In this study, we used fluorescently labeled particles (FLP) as Synechococcus-sized mimics to examine the contribution of pigmented (may include autotrophic and mixotrophic spp.) versus non-pigmented (heterotrophic) nanoflagellate grazing to Synechococcus morality. During the warm season from June to September, > 50% of the nanoflagellate population was pigmented (1.8–2 x 103 versus 1.2–1.6 x 103 cells mL–1). Consumption, or clearance rates per pigmented nanoflagellate, varied considerably (0.50–46.90 nL cell–1 h–1), with the highest rates in June. Raw data showed pigmented nanoflagellate grazing to account for 2–94% (mean 43%) of Synechococcus production from May to October. Pigmented nanoflagellates consumed 12.5-fold more Synechococcus than did ciliates. This study provides the first evidence that pigmented nanoflagellates are key grazers of Synechococcus populations in subtropical western Pacific coastal waters.

Communicating editor: K.J. Flynn


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