Home > Search Results: "Seminář Aktuální otázky vodárenské biologie /19./"
Search:
Search Tips :: Advanced Search
Search collections:
Sort by: Display results: Output format:
National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
The effect of a high through-flow on the plankton of the reservoir Slapy?
 Hrbáček, Jaroslav
In August 2003 an extraordinary intensive trough-flow has replaced the volume of water in the Slapy Reservoir in few days. Immediately a decrease of the transparency pH, frequency of planktonic crustaceans and an increase. In comparison with the previous years in the weeks following the flood an unusual increase of the frequency of blue greens mainly Microcystis and the diatoms Melosira a decrease of the diatom Fragillaria, and desmid Staurastrum was observed. As a possible cause decrease of pH and increase of total phosphorus has to be considered. As a possible cause of the decrease of the cladoceran Diaphanosoma and increase of species of Daphnia and Bosmina either the decrease of predation pressure by the export of fry due to the flood or the increase of food basis due to more intensive development of phytoplankton has to be considered. The effect of an exceptionally high through-flow on plankton is far from a dramatic one.
Detailed record
Causes of long-term increase in concentrations of dissolved organic matter in Římov Reservoir
 Hejzlar, Josef ; Kopáček, Jiří ; Porcal, Petr ; Haider, Z.
The concentration of dissolved organic matter (DOM) has increased in Rimov Reservoir since the late 1980s. Two main reasons were revealed for this increase: (i) an increase of DOM concentrations in the reservoir inflow that has been caused by more frequent summer high-runoff and DOM-rich events, and (ii) an increase in temperature and surface runoff volumes during winter months. The effects of decreasing atmospheric acid deposition and changes in farmland practices in the catchment also cannot be excluded as the other sources for the increase.
Detailed record
Phosphorus release from sediments - a comparison of methods
 Borovec, Jakub ; Brzáková, Martina
Phosphorus release rates from sediments were compared at two localities of Jordan Reservoir (Czech Republic) during the year. The release rates measured by incubation method were an order of magnitude higher comparing to the release rates calculated from phosphorus gradient in pore-water. A rapid decomposition of freshly settled seston at the sediment surface or just above the sediment was suggested to explain the differences.
Detailed record

Interested in being notified about new results for this query?
Subscribe to the RSS feed.
Digital Repository :: Search :: Submit :: Personalize :: Help
Powered by Invenio v1.1.2
Maintained by admin.invenio@techlib.cz
This site is also available in the following languages:
Česky  English