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Effects of fragmentation by impoundments and of pollution in the River Haná on species diversity on the fish community
Prokeš, Miroslav ; Baruš, Vlastimil
In the River Haná, 23 fish species belonging systematically to 6 families (Salmonidae, Thymallidae, Esocidae, Cyprinidae, Balitoridae, Percidae) were found. Due to river pollution in five localities, no fish occurrence was found, in the other 7 localities, the occurrence of individual species varied from 5 to 14 specimens. A natural recolonization of the poisened stream by fish occurred in two localities in the River Haná lower reaches long 8.4 km from the confluence with the River Morava.
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The fish stock diversity of the lower Kyjovka river stream
Horák, Václav ; Mendel, Jan
The ichthyological research of the Kyjovka River showed that it is inhabited by highly diversificated communities. The Kyjovka community is the source, which can support by migration local fish populations in the adjacent hydrological system within the floodplain forest. It is shown that active stream is essential for maintenance of stable and diversificated fish communities in the passive alluvium.
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Impact of water quality and physical habitat degradation upon fish biodiversity in small streams of the Czech Republic
Adámek, Z. ; Jurajda, Pavel
The data obtained during the surveys of fish assemblages in Czech streams of the Danube and Elbe river basins were evaluated with respect to the relation between fish biodiversity and level of water (organic pollution) and/or physical habitat quality (longitudinal heterogeneity, substrate, riparian vegetation, canalisation). Fish asseblages showed the highest biodiversity in betamezosaprobity in both lowland and highland streams. Their response were more pronounced regarding water quality rather than physical habitat deterioration, i.e. fish biodiversity declined with decreasing water quality more considerably than with physical habitat degradation.
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