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ASCR > Inst. Vertebrate Biology > Dept. Fish Ecology > People > Valová > Research Interests |
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Young-of-the-year assemblages in differently modified lowland riversMany European floodplain rivers have been regulated and channelised during the previous century, which has led to the depauperation of their structural heterogenity. These rivers often lack off-channel habitats, which present major spawning and nursery areas for fluvial fishes. If off-channel habitats are not available, only bank-side habitat in the main channel, often artifically stabilised by boulders, may be used as spawning and nursery areas. As a consequence, the success of reproduction of many fish species depends largely on availability of suitable spawning and nursery habitats within the river channel. Owing to their specific habitat requirements, high dependence on the physicas habitat and the sensitivity to habitat changes, 0+ juvenile fish have been recognised as reliable indicators of the success of reproduction and recruitment during particulat year. My PhD thesis investigates the natural fish reproduction in regulated-channelised lowland stretches of Morava and Dyje rivers. This study areas exhibit marked differences in the character of the mesohabitat using as spawning and nursery habitat. The aim of this study is comparing of 0+ juvenile fish assemblage structure, evaluating the natural fish reproduction and charecterise the nursery area of different species in these two adjacent rivers. This work is supervised by Pavel Jurajda. |
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