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Distribution and expansion of planctic cyanobacteria in Czech Republic
Komárek, Jiří ; Komárková, Jaroslava
Planktic cyanobacteria play important role in freshwater habitats in Czech Republic. They develop sometimes in massive water blooms, produce cyanotoxins and must be monitored from hydrobiological and sanitary point of views. Frequency of their occurrence and the species composition change in time and depend on managing of water ecosystems and on global changes of climate. The distribution and occurrence of various species in Czech Republic over last 60 years is reviewed.
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Drinking water reservoir Nýrsko - influence of macrophytes on water quality
Hejzlar, Josef ; Hohausová, Eva ; Komárková, Jaroslava ; Kopáček, Jiří ; Peterka, Jiří ; Duras, J.
The importance of macrophytes in P cycling was studied in Nýrsko Reservoir, an oligotrophic water body in western Bohemia. A comparison of the external P loading with the P content in macrophytes of Nýrsko Reservoir in 2004 demonstrated that macrophytes can play a significant role in P-cycling also in deep, pelagial-dominated water bodies on condition that the external P loading is low and macrophytes have appropriate conditions for their growth (mainly small extent of water level fluctuation). Nýrsko Reservoir is an apparent example of situations from limnological textbooks when macrophytes function as a stabilizer of the aquatic ecosystem with an efficient zooplankton grazing on phytoplankton allowing suitable water quality for drinking water production.
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Eutrophication trends in the Vltava catchment area, Czech Republic
Hejzlar, Josef ; Vyhnálek, V. ; Kopáček, Jiří ; Procházková, Lidmila ; Komárková, Jaroslava
Long-term trends in phosphorus and phytoplankton concentrations were studied in Slapy Reserv.,as a representative of most reservoirs with medium flushing rate in the Czech Rep. Phosphorus and chlorophyll a concentrations increased from the 1950s to the middle 1990s as a consequence of an increase of phosphorus use and release into surface waters by human population. The decrease in phosphorus and chlorophyll a concentrations during the last decade can be interpreted as a beginning of a long-term recovery of Slapy Reservoir resulting from the decrease in P-loading into the surface waters by human population. Further possibility how to reduce phosphorus input to the surface waters is especially P removal from municipal waste waters. After higher reduction of phosphorus from waste waters, accomplishable especially by the entire elimination of P from detergents and by technologies of enhanced P removal in waste water treatment facilities,the trophic status of Slapy Reserv. lower than in the 1950s can be expected.
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Limnologický výzkum šumavských jezer na sklonku 20. století
Vrba, Jaroslav ; Kopáček, Jiří ; Fott, J. ; Hartman, Petr ; Hejzlar, Josef ; Komárková, Jaroslava ; Macek, Miroslav ; Nedoma, Jiří ; Straškrábová, Viera ; Šimek, Karel
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