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Comparing Study of Fluvial Lakes in Middle Part of Elbe River and Upper Parts of Lužnice and Svratka River
Havlíková, Petra ; Janský, Bohumír (advisor) ; Pithart, David (referee) ; Pokorný, Jan (referee)
COMPARATIVE STUDY OF FLUVIAL LAKES IN FLOODPLAINS OF THE ELBE, LUŽNICE AND SVRATKA RIVERS Petra Havlíková ABSTRACT The aim of the thesis was to specify key differences in chemistry and biota (zooplankton communities) among fluvial lakes in three regions of Czech Republic: "střední Polabí" (central part of the Elbe River on the territory of Bohemia), "Horní Lužnice" (the upper part of the Lužnice River on the territory of Bohemia), and the Svratka River near Milovy (upper part of the Svratka River). The 10 studied lakes of the three regions differ in size, geology, shading, the influence of the river, and the level of anthropogenic impact. The following hypotheses were tested: 1) The chemical composition of the water in fluvial lakes is significantly different in different areas (floodplains). In the central Elbe River floodplain, there are the highest values of conductivity and concentrations of organic matter and nutrients. Fluvial lakes of the Svratka River floodplain near Milovy show the lowest level of these parameters, and fluvial lakes of the upper Lužnice River occur between the two previous regions. 2) The chemistry of fluvial lakes that have contact with the river through surface connection is significantly influenced by the river, and differs from the chemistry in fluvial lakes without any direct...
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Dialogue between ecologists and water managers - analyses
Pithart, David
The dialogue between ecologists and water managers in the Czech Republic is analysed. The benefit of this dialogue reflects the need of harmonizing the usual tasks of water management with potential risks of global climate change and permanent threatening of biodiversity. The obstacles of the dialogue are of different character and are listed as follows: 1.Different area and time scale of responsibilities. 2. Difficult harmonization of technique and nature, 3. Different ethical concepts, dealing with the role and position of human in the nature, 4. Different understanding of water cycle 5. Insufitient quantification of some aspects of water cycle 6. Fear of autonomous decisions, resulting in need of very complex and uneffective law system 7. Psychological barriers in initialization of multidisciplinary dialog and teams. 8. Lobbying and corruption. As one of the possible tools to overcame some of the barriers, the concept of ecosystem services is presented.
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Ecosystem services of a floodplain
Pithart, David ; Křováková, Kateřina ; Dušek, Jiří ; Žaloudík, Jiří
Natural segments of river floodplains have preserved the ability to provide a scale of ecosystem services. The aim of this study is to evaluate in a monetary way the selected ecosystem services of a natural segment of river Lužnice floodplain, Czech republic, based on the analysis and quantification of ecosystem processes and structures. Evaluated services are flood protection, carbon sequestration, biodiversity refugium and production of hay, wood and fish.
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Ekosystems services of river floodplain
Pithart, David ; Benedová, Zdeňka ; Křováková, Kateřina
The book of abstractcs contains contributions from the conference „Ecosystem services of river floodplains“, held in Třeboň, Czech republic, in april 2008. The articles deals with functions of river floodplains in the landscape, ecosystem services concept, water, nutrient and carbon retention, biodiversity, floodplain morphology and its development, hydrological aspects of river flooplains, andd water management policies and revitalizations.
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Biodiversity of standing floodplain waters and processes of its formation and preservation
Pithart, David
Water chemistry and planktic communities in the naturally eutrophic alluvial waters in the Lužnice floodplain have been studied. The floofplain waters are naturally eutrophic, with strong vertical physico-chemical gradients and oxygen depletions at the botom. Small pools and backwaters of this type have unique phytoplankton structure. Prevailing dominance of flegellates, namely Cryptophyceae, and low proportion of green chlorococcal algae and Diatoms, and almost absence of Cyanophyceae are very unusual for such eutrophic waters. Flagellate dominate thanks their ability to keep the vertical position in a permanently light limited conditions (resulted from poorly mixed water columns and intensive shading of water surface by vegetation). Floodplain geodiversity play crucial role, determining morphology and location of pools and backwaters, their exposition to flooding and inflows of underground water. Terrestial vegetation effects light exposition, leaf litter.
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