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JPR Advance Access originally published online on May 2, 2007
Journal of Plankton Research 2007 29(7):583-598; doi:10.1093/plankt/fbm040
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Phytoplankton size distribution and community structure: influence of nutrient input and sedimentary loss

Alexandrine Pannard1,{dagger}, Myriam Bormans1, Sebastien Lefebvre2, Pascal Claquin2 and Yvan Lagadeuc1,*

1 UMR 6553 Ecobio, FR/IFR Caren, University of Rennes, Campus De Beaulieu, Batiment 14B, AV. General Leclerc, Rennes 35042, France 2 University of Caen, UMR 100 Ifremer, Laboratoire De Biologie Et Biotechnologies Marines, IBFA, Esplanade De La Paix, 14032 Caen Cedex, France

* Corresponding Author: yvan.lagadeuc{at}univ-rennes1.fr

Received on February 3, 2007; accepted on April 24, 2007


  Abstract

This study examines the effects of nutrient availability and sedimentary loss on the dynamics of freshwater phytoplankton, from the physiological state at the cellular level to the competition issue at the community level. We studied the separated and combined responses to nutrient inputs and mixing, of a phytoplankton community, in terms of size fractionated photosynthetic activity and biomass, exported biomass and species composition. The community was composed of two dominant species, which differed in their sinking velocity. Experiments were conducted during 8 days in 12 water columns of 50 L, in light and temperature controlled conditions. The nutrient input was found to be the predominant factor affecting sedimentary fluxes and community composition, but mixing had also a significant effect on the community structure and sedimentary fluxes when combined with nutrient inputs. In this latter case, the large sinking species, Tribonema sp. (Xanthophyceae), developed, due to both a decrease of sedimentary loss by upward advection and the enhanced growth from nutrient inputs, as indicated by the higher photosynthetic activity measured using chlorophyll a in vivo fluorescence. The combined effect of both factors reduced the difference between growth and loss rates and increased the viability of the sinking populations.

{dagger} Present Address: Departement Des Sciences Biologiques, University of Quebec at Montreal (UQÀM), CP 8888, SUCC. Centre Ville, Montreal, QUEBEC, Canada H3C 3P8

Communicating editor: K.J. Flynn


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