Number of found documents: 116
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Development of microbial activity in the Vltava River - a longitudinal profile to Podolí and downstream
Svoboda, J.; Vrba, Jaroslav; Simanov, L.; Fuksa, J. K.
2002 - Czech
Extracellular ß-glucosidase activity, bacterial number (direct counts and MPA colony forming units), chlorophyll .i.a./i. concentration, BOD.sub.5./sub., and COD were measured along the Vltava River and its reservoir cascade in 2000 (April-September;n = 5-8). The study demonstrated an important role of reservoirs in water quality management and, in particular, the dominant role of the microbes in matter transfers, decomposition, and nutrient dynamics in the transient zones of reservoirs. Keywords: extracellular enzyme; nicrobial activity; bacteria; aktivita; řízení jakosti Available at various institutes of the ASCR
Development of microbial activity in the Vltava River - a longitudinal profile to Podolí and downstream

Extracellular ß-glucosidase activity, bacterial number (direct counts and MPA colony forming units), chlorophyll .i.a./i. concentration, BOD.sub.5./sub., and COD were measured along the Vltava River ...

Svoboda, J.; Vrba, Jaroslav; Simanov, L.; Fuksa, J. K.
Hydrobiologický ústav, 2002

What kind of information can be derived from the long-term data on zooplankton in relation to the changes of the fish stock of the Slapy reservoir
Hrbáček, Jaroslav; Brandl, Z.; Straškraba, M.
2002 - Czech
Keywords: zooplankton biomass; reservoir; biomasa; změny Available at various institutes of the ASCR
What kind of information can be derived from the long-term data on zooplankton in relation to the changes of the fish stock of the Slapy reservoir

Hrbáček, Jaroslav; Brandl, Z.; Straškraba, M.
Hydrobiologický ústav, 2002

Giant traps for fishing in the inflow-zone of the Římov reservoir
Hladík, Milan; Kubečka, Jan; Pokorný, P.; Čech, Martin; Draštík, Vladislav; Kratochvíl, Michal; Peterka, Jiří; Prchalová, Marie; Vašek, Mojmír
2002 - Czech
The fish stock of the inflow-zone of the Římov Reservoir was studied by using two special constructed big traps. One trap was sampling the fish migrating from the reservoir to the Malse River, the other was sampling downstream migrants. The most intensive fish movement was recorded during spring spawning season. Proportionally to the fish stock of the reservoir, the tributary zone was used mainly by the bleak, .i.Alburnus alburnus./i., Asp, .i.Aspius aspius./i. and roach .i.Rutilus rutilus./i.. Smaller affinity to tributary spawning was found for the bream .i.Abramis brama./i. and perch, .i.Perca fluviatilis./i. (5 to 10 % of reservoir fish spawning in the tributary). Over 6000 kg of migrating fish were captured in the tributary area during spring periods of three years. Consequences of the application of tributary traps for fish exploitation and management are being discussed. Práce je věnována metodice lovu ryb migrujících přítokovou částí nádrže Římov. Pro tuto studii byly zkonstruovány dva obří vězence, které jsou v práci podrobně popsány včetně jejich obsluhy a možných technických zdokonalení. Do jednoho vězence byly loveny ryby migrující do přítoku a do druhého ryby migrující směrem do nádrže. Ryby byly loveny především v jarním období v letech 2000-2002. Během těchto tří let bylo uloveno přes 6000 kg ryb, nejsilnější migrace byla zaznamenána v jarním období během tření. Nejpočetnějšími migranty byla ouklej .i.Alburnus alburnus./i. a plotice .i.Rutilus rutilus./i., jako obligátní místo pro tření využívali přítok i bolen .i.Aspius aspius./i., cejnek Blica bjoerkna a tloušť .i.Leucicus cephalus./i.. Dalšími významnými druhy byly cejn .i.Abramis brama./i. a okoun .i.Perca fluviatilis./i., tyto druhy však využívají pro tření i příhodná místa v celé nádrži. Keywords: traps; fish; reservoir; lapače Available at various institutes of the ASCR
Giant traps for fishing in the inflow-zone of the Římov reservoir

The fish stock of the inflow-zone of the Římov Reservoir was studied by using two special constructed big traps. One trap was sampling the fish migrating from the reservoir to the Malse River, the ...

Hladík, Milan; Kubečka, Jan; Pokorný, P.; Čech, Martin; Draštík, Vladislav; Kratochvíl, Michal; Peterka, Jiří; Prchalová, Marie; Vašek, Mojmír
Hydrobiologický ústav, 2002

Chironomid communities of the Upper Stropnice River (Novohradské Mountains, South Bohemia)
Chalupová, Š.; Matěna, Josef
2002 - Czech
The communities of chironomid larvae of the Upper Stropnice River were studied semiquantitatively between the river kilometres 40-55 during 2000 and 2001. Altogether 29 taxa were observed. Dominant forms were .i.Apsectrotanypus trifascipennis./i., .i.Macropelopia nebulosa./i. and .i.Prodiamesa olivacea./i.. The water quality calculated according to the chironomid communities corresponds to beta-mesosaprobity, only in the area of Upper Stropnice village it deteriorates to alfa-mesosaprobity. This fact gives evidence to presence of point sources of organic pollution. Further downstreams the values of saprobity return to the state above the source of organic pollution. In the anthropically influenced area of the stream the decrease in the diversity of chironomid communities occured. It is necessary to consider the results as preliminary, because the only family Chironomidae was analysed in detail, for exact results the analysis of the whole macrobenthic community is necessary. Společenstva larev pakomárů byla sledována semikvantitativně v horním toku Stropnice mezi říčními kilometry 40-55 v létech 2000-2001. Celkem byl prokázán výskyt 29 taxonů. Dominantními formami byly .i.Apsectrotanypus trifascipennis./i., .i.Macropelopia nebulosa./i. a .i.Prodiamesa olivacea./i.. Kvalita vody vypočtená podle společenstev pakomárů odpovídá beta-mezosaprobitě, pouze v oblasti obce Horní Stropnice se zhoršuje na alfa-mezosaprobitu. To svědčí o přítomnosti bodových zdrojů organického znečistění. V dalším průběhu toku se samočistícími procesy hodnoty saprobity vrací do stavu nad zdrojem znečistění. V antropicky ovlivněném úseku toku byl zjištěn pokles diverzity společenstev pakomárů. Výsledky je třeba považovat za předběžné, protože byla detailně analyzována jediná čeleď Chironomidae, pro přesné výsledky je nezbytná analýza celého společenstva makrozoobentosu. Keywords: macrozoobenthos; diversity; saprobity; biocenózy; obce Available at various institutes of the ASCR
Chironomid communities of the Upper Stropnice River (Novohradské Mountains, South Bohemia)

The communities of chironomid larvae of the Upper Stropnice River were studied semiquantitatively between the river kilometres 40-55 during 2000 and 2001. Altogether 29 taxa were observed. Dominant ...

Chalupová, Š.; Matěna, Josef
Hydrobiologický ústav, 2002

Determination of biodegradable dissolved organic carbon in a column bioreactor
Porcal, Petr; Hejzlar, Josef
2001 - Czech
Keywords: DOC; bacterial-growth; biodegradable DOC; vědecká setkání; růst Available at various institutes of the ASCR
Determination of biodegradable dissolved organic carbon in a column bioreactor

Porcal, Petr; Hejzlar, Josef
Hydrobiologický ústav, 2001

A scenario study for the recovery from eutrophication of Lipno reservoir
Hejzlar, Josef; Hladík, Milan; Růžička, Martin; Rohlík, V.
2001 - Czech
Keywords: phosphorus; eutrophication; modelling; fosfor Available at various institutes of the ASCR
A scenario study for the recovery from eutrophication of Lipno reservoir

Hejzlar, Josef; Hladík, Milan; Růžička, Martin; Rohlík, V.
Hydrobiologický ústav, 2001

Concentrations of nutrients (N, P) in water courses in the basins of Lipno reservoir and their relationships to land use
Hejzlar, Josef; Žaloudík, Jiří; Rohlík, V.
2001 - Czech
Keywords: phosphorus; nitrogen; land use; dusík; fosfor Available at various institutes of the ASCR
Concentrations of nutrients (N, P) in water courses in the basins of Lipno reservoir and their relationships to land use

Hejzlar, Josef; Žaloudík, Jiří; Rohlík, V.
Hydrobiologický ústav, 2001

Is it possible to reverse eutrophication of Jordan reservoir?
Borovec, Jakub; Hejzlar, Josef; Porcal, Petr; Žaloudík, Jiří; Nedvěd, L.; Porcalová, P.
2001 - Czech
Keywords: eutrophication; restoration; phosphorus; restaurování; fosfor Available at various institutes of the ASCR
Is it possible to reverse eutrophication of Jordan reservoir?

Borovec, Jakub; Hejzlar, Josef; Porcal, Petr; Žaloudík, Jiří; Nedvěd, L.; Porcalová, P.
Hydrobiologický ústav, 2001

Phosphorus retention in drinking water reservoir Římov
Brzáková, Martina; Hejzlar, Josef; Borovec, Jakub; Nedoma, Jiří; Seďa, Jaromír; Šimek, Karel; Vrba, Jaroslav
2001 - Czech
Keywords: reservoir; dynamics of phosphorus; seston; vodárenské nádrže; pitná voda Available at various institutes of the ASCR
Phosphorus retention in drinking water reservoir Římov

Brzáková, Martina; Hejzlar, Josef; Borovec, Jakub; Nedoma, Jiří; Seďa, Jaromír; Šimek, Karel; Vrba, Jaroslav
Hydrobiologický ústav, 2001

A methodology for scenario studies of water quality in reservoirs
Hejzlar, Josef; Růžička, Martin
2001 - Czech
Keywords: reservoir management; watershed management; modelling; jakost vody; management Available at various institutes of the ASCR
A methodology for scenario studies of water quality in reservoirs

Hejzlar, Josef; Růžička, Martin
Hydrobiologický ústav, 2001

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