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Dynamika společenstva makrozoobentosu podhorského toku s početnou populací raka signálního.
ŠŤASTNÁ, Hana
Assessment of macroinvertebrates population at the Křesanov brook above the town of Vimperk. It contains a large population of the signal crayfish. It is non-native in Europe. Sampling was carried out in 2020. Macroinvertebrates sampling was done. Then, in the laboratory, its determination and detection of abundance and biomass was done. Statistical analyses were subsequently made using hydrobiological indices from the collected data. The analyses compared two stream segments that were different in some parameters.
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The diversity of macrozoobenthos in a stream affected by an outfall of a treated wastewater from wastewater treatment plant
SOUKUPOVÁ, Tereza
The aim of this work was to evaluate the diversity of macrozoobenthos at Živný stream. This stream flows through the town of Prachatice, where outfall of the town's wastewater treatment plant (WWTP) flown into it. Sampling was carried out in 4 profiles; C, U, E and R, each in five different dates during the year 2015. Saprobic index and Shannon-Wiener diversity index were calculated based on abundance and biomass of macroinvertebrate community. Neither biomass nor abundance did not show any significant differences among sampling profiles. On the contrary the values of saprobic index and diversity index differed significantly among sampling sites (p < 0.05). Highest average value of abundance and biomass of macrozoobenthos was reached above the outfall of WWTP in profile U (2068 ? 1712 ind.m-2), while the lowest average value of abundance was found in profile E under the outfall of WWTP (925 ? 781 ind.m-2). The biomass of macrozoobenthos community was the lowest in the profile R (4.25 g.m-2). The saprobic index ranged from 1.55 to 2.32. These values correspond to betamesosaprobity which reveals that the creek contains moderately to medium organically polluted water. The diversity index was highest in sampling profile C (H' = 2.59), on the contrary in the following profile U, which was placed in the town above the WWTP, the diversity index was lowest (H' = 1.52).
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Monitoring of 0+ juvenile fish communities in selected Moravian rivers
GEBAUER, Radek
Monitoring of 0+ juvenile fish communities was realized in years 2012 and 2013 in 39 localities in 25 selected Moravian rivers. It was realized in collaboration with Povodí Moravy SOE research workers. The aim of this diploma thesis was to conduct a survey of 0+ juvenile fish communities and evaluate basic attributes of these ichthyocenosis (species richness, biodiversity, equitability, abundance and domiance). Secondary aim was the evalutation od hydromorphological conditions and water quality based on data provided by Povodí Moravy SOE. This monitoring was realized using the mobile FEG 1500 electrofishing device. The electrofishing crew moved upstream using continuous fishing strategy. Each locality was selected by highly experienced research workers of Povodí Moravy SOE. Caught fish were determined immediately and carefully retruned to the stream. In total there was present 28 0+ juvenile fish species. The most frequent was chub (Leuciscus cephalus, 23 localities), gudgeon (Gobio gobio, 19 localities) and roach (Rutilus rutilus, 19 localities). In 13 localities occured the fish fry of barbel (Barbus barbus) wich is positive surprise due to its sensitivity to water pollution. In contrast the massive presence of round goby (Neogobius melanostomus) in some localities was an unpleasant finding. 4 localities were without fish fry. This survey has observed increasing trend of biodiversity depending on improving of hydromorphological status while the abundance showed almost no diference. Saprobic index of 0+ juvenilie fish community increased with deteriorating of water quality which could mean that the fish fry is relatively reliable indicator of water quality. The results of this diploma thesis could be used in documenting of Moravian streams and in comparisson with another monitorings in these localities.
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