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During the twenty-five years of existence, water quality has declined and severe blooms of cyanobacteria have occurred in the Grlište Reservoir. Changes in phytoplankton functional groups over time and along horizontal and vertical gradients were investigated in the course of a one-year study in this water-supply reservoir. We identified 19 dominant taxa, classified into 12 phytoplankton associations. The presence of the codons C, P, D and S1 differentiated the transitional from the lacustrine part of the reservoir. The nitrogen-fixing cyanobacteria Dolichospermum viguieri dominated the phytoplankton community in the epilimnion during August and September, when the reservoir showed P-limitation, but the bloom was not observed. The driving factors that accounted for the main variability in phytoplankton functional groups along the seasonal and vertical profile were identified using the direct gradient analysis (RDA). Our results revealed the importance of two bipolar factors. The first factor explained the variability in phytoplankton due to thermal stratification and physical mixing, each process affecting the algal community in contrasting ways. The second factor was interpreted as reduction vs. oxidation processes. Positive correlation between stratification and water pumping by a drinking water plant indicated that human activities were not severe enough to break down the thermal stability of the reservoir and to cause a cyanobacterial bloom.
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Tom
Strony
431--444
Opis fizyczny
Bibliogr. 38 poz., rys., tab., wykr.
Twórcy
autor
- Scientific Institution, Department of Ecology and Technoecomonics, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Beograd 6, PAK 125213, POB 473, Serbia
autor
- Scientific Institution, Department of Ecology and Technoecomonics, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Beograd 6, PAK 125213, POB 473, Serbia
autor
- Scientific Institution, Department of Ecology and Technoecomonics, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Beograd 6, PAK 125213, POB 473, Serbia
autor
- Scientific Institution, Department of Ecology and Technoecomonics, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Beograd 6, PAK 125213, POB 473, Serbia
autor
- Scientific Institution, Department of Ecology and Technoecomonics, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Beograd 6, PAK 125213, POB 473, Serbia
autor
- Scientific Institution, Department of Ecology and Technoecomonics, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Beograd 6, PAK 125213, POB 473, Serbia
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikator YADDA
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