Aquatic Sciences Meeting, Albuquerque 2001
| CS37 Zooplankton |
| Date: Wednesday, February 14, 2001, Time: 2:15:00 PM |
| Location: Aztec |
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| Baranyi, C, , Inst. of Ecology and Consevation Biology, Dept. of Limnology, University of Vienna, Vienna, Austria, Kcbaranyi@netscape.net |
| Hein, T, , Inst. of Ecology and Consevation Biology, Dept. of Limnology, University of Vienna, Vienna, Austria, Thomas.hein@univie.ac.at |
| Keckeis, S, , Inst. of Ecology and Consevation Biology, Dept. of Limnology, University of Vienna, Vienna, Austria, a8502903@unet.univie.ac.at |
| Holarek, C, , Inst. of Ecology and Consevation Biology, Dept. of Limnology, University of Vienna, Vienna, Austria, |
| Schiemer, F, , Inst. of Ecology and Consevation Biology, Dept. of Limnology, University of Vienna, Vienna, Austria, |
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| RETENTION TIME DETERMINING ZOOPLANKTON BIOMASS AND COMMUNITY STRUCTURE IN A DANUBE FLOODPLAIN SYSTEM |
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| Zooplankton biomass and biodiversity were examined in a Danube floodplain system of high hydrological dynamic. Temporal patterns were used to assess the significance of water retention time for the regulation of zooplankton population dynamics. The sampling period covered a broad range of hydrological conditions ranging from lotic to lentic situations. Retention time could be identified as the driving variable governing total zooplankton biomass following a sigmoidal relationship. It also proofed to have different effects on rotifers and crustaceans. Rotifer biomass followed a polynomial 2nd order relationship showing a maximum at medium retention time while crustacean biomass was positively linear related. Biodiversity patterns of the two taxonomic groups differed significantly. Rotifer species number declined linearely along the hydrological gradient while crustacean species number increased exponentialy, showing a maximum at periods of long lotic conditions. We explained this hydrological succession by the alternation of flood caused mortality (e.g. washing out effects) and taxa specific potential of reproduction along the hydrological gradient. Periods of long retention, favoured crustacean development, most likely due to competitive advantages, whereas rotifer biomass and species number declined. |
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