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

par Descy, Jean Pierre;Leporcq, Bruno ;Viroux, L.;Francois, Christine ;Servais, Pierre
Référence Journal of plankton research, 24, 3, page (161-166)
Publication Publié, 2002

Article révisé par les pairs

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Résumé :

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 using 14C 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.