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Diverzita rybího osídlení dolního toku řeky Kyjovky
Horák, Václav ; Mendel, Jan
Výzkum rybího osídlení toku Kyjovky prokázal jeho vysokou druhovou diverzitu. Ichtyofauna říčky Kyjovky dotuje rybí osídlení okolního hydrologického systému lužního lesa. Byla prokázána nezbytnost aktivního toku pro udržení stabilních a druhově pestrých rybích společenstev ryb v pasivním aluviu.
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Biodiverzita ichtyofauny České republiky (4)
Lusk, Stanislav ; Lusková, Věra ; Halačka, Karel
Tato v pořadí již čtvrtá konference byla v převážné míře věnována problematice biodiverzity ryb. Vedle příspěvků obsahujících poznatky o biodiverzitě konkrétních subjektů na konkrétních lokalitách a biotopech, a to na úrovni společenstva, druhu, ale i vnitrodruhové, byly předneseny i příspěvky, ve kterých je položen důraz na ochranu biodiverzity.
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Ichthyofauna of the lower reaches of the Dyje River and the adjacent floodplain with floodplain forests
Lusk, Stanislav ; Lusková, Věra ; Halačka, Karel ; Horák, Václav ; Pražák, O.
The lower reaches of the Dyje River with adjacent floodplain constitute an unique territory fragment in the Czech Republic. Its hydrological system is prominent with a high diversity of aquatic habitats including natural floodings over the floodplain part. During last 50 years, the occurrence of 49 species fish was found there in total. Of them, 41 species are assessed to be autochtonous, i.e. 75% of the native ichthyofauna structure of the Czech Republic. As strategically significant, the direct barrier-free connection of the lower Dyje River through the Morava River with the Danube has been manifested. In such way during recent years, the occurrence has been renewed of naturally immigrating Pelecus cultratus, Gymnocephalus schraetser and Zingel zingel, which had disappeared in the past. Sporadically, also the occurrence of Acipenser ruthenus and the wild form Cyprinus carpio is renewed. Naturally in the territory of the Czech Republic, new species such as Carassius auratus, Proterorhinus marmoratus, Sander volgense and Gymnocephalus baloni have penetrated. This unique territory is intended to be proclaimed for the Biospherical reserve and as protected territory for selected fish species within the NATURA 2000 system.
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Revitalisation and fishes in the inundation area and the floodplain forests along the lower reaches of the River Dyje
Lusk, Stanislav ; Halačka, Karel ; Lusková, Věra ; Horák, Václav
The hydroeconomical modifications during 1968-1986 have changed fundamentally the natural hydrological regime of the lower Dyje River and adjacted floodplain. The proper stream channel was straightened and erected flood-oreventing leeves stopped natural floodings over the original floodplain substantial part. Elaborated and successively realised were specific rehabilitation projects that should eliminate negative impact of the modifications performed on the fish biota there. Concerned in the rehabilitation of the longitudinal and lateral migration permeability of the respective hydrological system for fish. That means to achieve the increase of aquatic habitat diversity by revitalisation of vanishing or by creation of new beckwater, pools and lagoons. The controlled inundation over a part of alluvial meadows has improved conditions for reproduction of phytophilous fish species. The rehabilitation of permanent connection in oxbows cut off (original river meanders) with the Dyje River will increase significantly the diversity of hydrological and geomorphological characteristics of the river bed channelised. The final goal is to create conditions for the ichthyofauna stabilisation and development in the respective area.
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