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JPR Advance Access originally published online on September 6, 2005
Journal of Plankton Research 2005 27(9):881-894; doi:10.1093/plankt/fbi061
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org.

Phytoplankton seasonal dynamics in a Mediterranean coastal lagoon: emphasis on the picoeukaryote community

Béatrice Bec1,*, Julie Husseini-Ratrema1, Yves Collos1, Philippe Souchu2,{dagger} and André Vaquer1

1 Laboratoire Ecosystèmes Lagunaires, UMR-CNRS 5119 Case 093, Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France and 2 Laboratoire Côtier del, Ifremer, BP 171, Avenue Jean Monnet, 34203 Sète Cedex, France {dagger} Present Address: Crema BP 5, 17137 L’Houmeau, France

* Corresponding Author: bbec{at}univ-montp2.fr

Received April 5, 2005; accepted in principle August 3, 2005; accepted for publication August 30, 2005; published online September 6, 2005
Communicating editor: K.J. Flynn

The dynamics of the phytoplankton community were investigated in a marine coastal lagoon (Thau, NW Mediterranean) from February 1999 to January 2000. Dilution experiments, chlorophyll a (Chl a) size-fractionation and primary production measurements were conducted monthly. Maximum growth and microzooplankton grazing rates were estimated from Chl a biomass fractions to separate pico- from nano- and microphytoplankton and by flow cytometry to distinguish between picoeukaryotes and picocyanobacteria. In spring, the phytoplankton community was dominated by Chaetoceros sp. and Skeletonema costatum, which represented most of biomass (B) and primary production (P). Nano- and microphytoplankton growth was controlled by nutrient availability and exceeded losses due to microzooplankton grazing (g). Picoeukaryote and cyanobacteria growth was positively correlated with water temperature and/or irradiance, reaching maximum values in the summer (2.38 and 1.44 day–1 for picoeukaryotes and cyanobacteria, respectively). Picophytoplankton accounted for 57% of the biomass-specific primary productivity (P/B). Picophytoplankton was strongly controlled by protist grazers (g = 0.09–1.66 day–1 for picoeukaryotes, g = 0.25–1.17 day–1 for cyanobacteria), and microzooplankton consumption removed 71% of the daily picoplanktonic growth. Picoeukaryotes, which numerically dominate the picoplankton community, are an important source of organic carbon for the protistan community and contribute to the carbon flow to higher trophic levels.


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