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Journal of Plankton Research, Vol 21, 1659-1679, Copyright © 1999 by Oxford University Press

ORIGINAL ARTICLES

Bacterivory of metazooplankton, ciliates and flagellates in a newly flooded reservoir

A Thouvenot, M Richardot, D Debroas and J Devaux
Laboratoire de Biologie Comparée des Protistes, Unité associée CNRS, Université Blaise Pascal Clermont Ferrand II, 63117 Aubière Cedex, France

Bacterial consumption by metazoan zooplankton and phagotrophic protists was measured in situ during the period of thermal stratification in the epilimnion (1 m) and metalimnion (7 m) of a newly flooded reservoir (Sep reservoir, France). The mean bacterial consumption was 2.53 x 106 bacterial l-1 h-1 at 1m and 0.97 x 106 bacteria l-1 h-1 at 7m. The main consumers over the whole study period were the cladocerans Daphnia longispina and Ceriodaphnia quadrangula, accounting on average for 72% of the potential total predation of bacteria at 1 m and 56% at m, especially during the months of May-June and August. Heterotrophic nanoflagellates (HNF), which accounted for 12% estimated total predation of bacteria at 1 m and 13% at 7m, only exerted a limited predation, mainly by a Monas-type cell. Ciliates, dominated in terms of abundance by Pelagohalteria viridis, accounted for 4% of total predation in the epilimnion (0.00-0.42 x 106 bacteria l-1 h-1). In a newly flooded reservoir, metazoan zooplankton appear to be the main consumers of bacteria. Predation of ciliates and HNF by zooplanktonic crustaceans could account for the low contribution of components of the microbial loop to bacterial consumption.
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