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Journal of Plankton Research Vol.24 no.3 pp.161-166, 2002
© Oxford University Press 2002

Phytoplankton production, exudation and bacterial reassimilation in the River Meuse (Belgium)

Jean-Pierre Descy1, Bruno Leporcq1, Laurent Viroux1, Cédric François1 and Pierre Servais2

1 Laboratoire D'ecologie Des Eaux Douces, Urbo, Fundp, 61 Rue De Bruxelles, 5000 Namur, Belgium; 2 Ecologie Des Systèmes Aquatiques, Université Libre De Bruxelles, Campus De La Plaine, Cp 221, 1050 Bruxelles, Belgium

J-P. Descy,.E-mail: jean-pierre.descy{at}fundp.ac.be

Extracellular release of phytoplankton was investigated in the upper middle River Meuse (Belgium) in order to estimate the contribution of this process as a source of dissolved organic matter in the system. Particulate primary production, exudation and reassimilation of exudates by free-living and attached bacteria were estimated in parallel using14C labelling and selective filtration techniques. The results showed that total phytoplanton exudation (EOCt) represented on average 7% of the particulate primary production. Of this excreted organic carbon, 77% was taken up by bacteria; attached bacteria contributed 30% of this uptake. Calculations showed that in this river system, the excretion of organic carbon by algae accounted on average for 22% of the bacterial carbon demand.


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