Impact of a Flood Event on the Planktonic Food Web of the Schelde Estuary (Belgium) in Spring 1998 |
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Authors: | Koenraad Muylaert Wim Vyverman |
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Institution: | (1) Department of Biology, Katholic University Leuven, Kasteelpark Arenberg 31, B-3001 Heverlee, Belgium;(2) Department of Biology, University Gent, Krijgslaan 281 – S8, B-9000 Gent, Belgium |
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Abstract: | To evaluate the effect of short-term changes in discharge on plankton dynamics, a station in the upper reaches of the Schelde
estuary was monitored during 1 month in spring 1998 with a sampling frequency of 1–2 days. During this monitoring period,
a flood event occurred during which discharge increased about 5-fold. This flood event had a strong effect on the composition
of the planktonic community. Rotifers were strongly negatively affected by the flood event while densities of heterotrophic
nanoflagellates and scuticociliates increased. Chlorophyll a concentration and abundance of bacteria, oligotrich ciliates and crustacean zooplankton did not respond clearly to the flood
event. Although the flood event lasted only a few days it took more than 2 weeks for the planktonic community to return to
its original composition. |
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Keywords: | freshet phytoplankton zooplankton microbial food web river freshwater tidal estuary |
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