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Fishpond management and ecological stability of fishponds -as a key water habitats of the Třeboň region
Pechar, Libor
Fishponds have an important role in the hydrological system of the Třeboň region and generally they represent the most common type of stagnant water habitat in the Czech Republic. Most of the fishponds are several hundred years old, and have therefore lost most of their man-made character. The period of intensification of fish production started in the 1930s, when liming and fertilization of the fishponds became a common practice. Since the 1930s, fish production has increased from a mean of about 50 kg ha-1 to more than 500 kg ha-1. Common carp, Cyprinus carpio L. has been the main cultivated fish species. Management for higher fish stock densities, accompanied by higher nutrient loads result in increasing trophic levels, ultimately reaching a state of 'hypertrophy'. The main symptoms of this state are the massive development of phytoplankton and cyanobacterial ' algal blooms', great fluctuations in oxygen concentrations, pH, which, in turn, destabilise the fish pond ecosystem.
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Meteorological monitoring in the Třeboň Basin Biorphere Reserve
Pokorný, Jan ; Kolmanová, Andrea
Monitoring of climate and atmospheric deposition in the Třeboň landscape protected area long term data on month precipitation [1901-1999] chemical composition of rain water ind. heavy metals content [1990-1999] monthly sums of global solar radiation [1997-1999], precipitation free periods for Třeboň region are given. Year courses of underground water fluctuation together with retention capacity and rain precipitation are discussed for different vegetation types of the Red Bog.
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Long-term research in wetland of the Třeboň Basin Biosphere Reserve
Květ, Jan ; Straškrábová, Viera
The Třeboň basin belongs to most investigated areas of the Czech Republic. A great variety of ecological data enable to make long-term comparisons of the recent state of the ecosystem with those occuring some decades to ca. hinred years ago. Thanks to well-documented history of human impacts into natural relations, the historical aspect may also be utilized. This helps considersably to realize the long-term ecological research.
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The importance of the Třeboň Basin for International Wetland Research
Květ, Jan
The Třeboň Basin belongs to the wetland-richest regions of Central Europe: wetlands occupy at least 20 procent of the area of the Třeboň Basin Protected Landscape Area/Biosphere Reserve.Declaration of the Třeboň Basin and some adjacent areas as a BR 1977 a PLA 1979, and an area comprising several wetlands of international importance according to the Ramsar Convention 1991.
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