Bacterivory of metazooplankton, ciliates and flagellates in a newly flooded reservoir |
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Authors: | Thouvenot A; Richardot M; Debroas D; Devaux J |
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Institution: | Laboratoire de Biologie Comparée des Protistes, Unité associée CNRS, Université Blaise Pascal Clermont Ferrand II, 63117 Aubière Cedex, France |
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Abstract: | 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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