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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Freshwater macroinvertebrates and their use for assessment of environmental changes in running waters
 Kolaříková, Kateřina ; Stuchlík, Evžen (advisor) ; Matěna, Josef (referee) ; Porcal, Petr (referee)
The dissertation thesis consists of five articles, bringing together results from investigations of macroinvertebrates in running waters. The use of freshwater macroinvertebrate organisms to assess environmental changes was based on the following facts: a) the presence/absence of taxa provide information about abiotic factors and/or about the pollution status of the site, b) they are indigenous and sedentary species, so that the environmental implications can be related to the site they live on, c) the organisms accumulate xenobiotic elements or compounds, thus reflecting the contaminant level in the environment. Localization of the sampling sites was related to the "hot-spots" of environmental problems. The particular investigations were carried out in the Elbe River catchment and in the Czech mountains on the selected headwater streams of the GEOMON network of the Czech Geological Survey. The Elbe was considered one of the most polluted rivers across Europe in the second half of the past century until the socio-economic transformation after 1989. The headwater streams in the Czech Republic were chosen with respect to the problem of acidification. The ability of bioaccumulation of xenobiotics in macroinvertebrate organisms was used to assess the long-term load of the Elbe ecosystem with trace...
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Faktory působící na vegetaci příkopů a stok v biosférické rezervaci Třeboňsko
 Kozlíček, Z. ; Květ, Jan
This study evaluates the ecological conditions and their influence on the species composition of the vegetation growing in the ditches and on their banks in the Třeboň Basin Biosphere Reserve, Czech Republic. The results obtained have facilitated the definition of an optimum vegetation management strategy for conservation of the flora of the ditches.
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