Zooplankton in a Danube River Arm near Rusovce (Slovakia) |
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Authors: | Marta Illyová Katarína Bukvayová Danka Némethová |
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Institution: | (1) Institute of Zoology, Slovak Academy of Sciences, SK-84506 Bratislava, Slovakia;(2) Department of Ecology, Faculty of Natural Sciences, Comenius University, Mlynská dolina B-2, SK-84215 Bratislava, Slovakia;(3) Research Centre for Environmental Chemistry and Ecotoxicology, Masaryk University, Kamenice 3, CZ-62500 Brno, Czech Republic |
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Abstract: | Poor quantity of zooplankton was recorded in a Danube arm situated on the right side of the Danube River in Slovakia (river
km 1857) in 2002 and 2003. All over the year the arm is significantly influenced by groundwater by reason of seepage. Because
of low mean water temperature (12°C) and poorly developed macrovegetation in particular, the arm reminds gravel pit-like.
The annual average of zooplankton biomass was low and ranged from 0.35 g m−3 (2002) to 1.28 g m−3 (2003), because of low crustacean abundance. Total cladoceran abundance was excessively low in both years and ranged from
3.5 N L−1 (2002) to 16.6 N L−1 (2003). Small species, Bosmina longirostris and Chydorus sphaericus were dominant. Only four adult Copepoda — Cyclops vicinus, Thermocyclops crassus, Eurytemora velox and Eudiaptomus gracilis — were recorded in quantitative samples of both years. In the zooplankton assemblage dominated rotifers (Synchaeta pectinata, Synchaeta oblonga, Polyarthra dolichoptera and Keratella cochlearis) which represented 78% and 67% of total abundance respectively. The total of 19 species of rotifers, 34 Cladocera species
and 16 taxa of Copepoda were found. |
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Keywords: | river-floodplain habitats Cladocera Copepoda Rotifera |
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