Ekologické aspekty samovolné obnovy fluviálních procesů na řece Bečve
| Title in English | Ecological aspects of fluvial processes recovery at Bečva River |
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| Authors | |
| Year of publication | 2014 |
| Type | Conference abstract |
| MU Faculty or unit | |
| Citation | |
| Description | Flood-induced renaturalization of Bečva River segments was studied applying multidisci-plinary approach. Ecological linkages among channel units and stream biota (macroinver-tebrates, phytobenthos, fish) were identified. Specific macroinvertebrate taxa and commu-nity characteristics were found for four types of river habitats (channel units). Based on position in the channel and using hydraulic thresholds there were distinguished riffles and pools in central part of main channel, marginal zone of main channel and lateral arms/pools. Differentiation of stream biota between central-channel and lateral habitats was related to degree of their isolation (connectivity of side arms). Macroinvertebrate tro-phic strategies and substrate preferences reflected importance of substrate specificity in lateral habitats. Partial recovery of channel forming processes, increased bank zone heterogeneity, tempo-ral occurence of large woody debris in the channel and formation of lateral channels/pools characterized renaturalization process of Bečva River at studied segments. Study results contribute to knowledge of hydromorphological processes in gravel bed river, development of biological indicators responding to physical changes of channel, ecological processes in relation to seasonal and discharge-related dynamics of fluvial system. Study outputs support planning of river restoration by development the efficient monitoring strategies (sampling design – habitats, seasons; indicators; survey methods), hydraulic modelling and analyzing biological response to in-stream changes. Bečva River sites were included in European-scale network of restoration case studies with complex data avail-able (REFORM project). |
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