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Influence of reservoirs on communities of river flow
Lavičková, Šárka ; Černý, Martin (advisor) ; Tátosová, Jolana (referee)
Construction of dams significantly affects the chemical, biological and physical properties of the flow below the dam. These changes include a decrease in the numbers of individuals one or more species, the complete disappearance of species, or the introduction of non-native species. Disruption of natural water flow also applies to animals, who have only one stage of their life (usually reproduction) connected with the aquatic environment, although they are not permanent residents. Also necessitate significant changes in the life cycles of native plants and animals near the regulated river. Basic principles of behavior impounded flow describes the concept of serial discontinuity, which assumes that the construction of the dam will break river continuum, which then causes changes in river communities. Undergoing significant change such as flow regime in the river below the dam, the most striking changes are caused by the flow hydroelectric power stations. In addition, a temperature change in the flow decreases turbidity and often the availability of nutrients, because the location of the dam with the usual outlets (high or medium) acts as a trap sedimentary particles of organic and inorganic origin. It is important but also the contact area of the river, for example, reducing the zaplavovaného...
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