Publication details
Prostorová variabilita hyporeosu v toku s ovlivněným průtokovým režimem
| Title in English | Spatial variability of hyporeos in a stream with artificial discharge regime |
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| Authors | |
| Year of publication | 2010 |
| Type | Conference abstract |
| MU Faculty or unit | |
| Citation | |
| Description | A composition of hyporheic fauna was studied in the Dyje river downstream the reservoir Vranov. The dam also serves as a hydroelectric power station and affects downstream fauna by artificial outflow. We assumed the impact of hydrological conditions and the position in the stream on the distribution of hyporheos. These factors were related to fluctuated discharge, so we supposed the impact of artificial outflow as well. The study was carried out at five sites with different flow conditions in two seasons (autumn 2002 and 2003). Samples were taken using freeze-coring to the depth of 40 cm. The sediment structure and the organic matter content were assessed. The most important factor affecting the distribution of hyporheic fauna was the depth (10,4 % of explained variability). About 96 % of invertebrate were concentrated in the upper 20 cm layer. The second important factor was the position in the stream (streamline and head of a gravel bar together explained 15,8 % of variability), which was associated with local flow conditions. A comparison between these results and these results obtained from a stream with natural discharge regime was made. |