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The development of water quality in the headwaters of Berounka River catchments area
Wild, Aleš ; Janský, Bohumír (advisor) ; Benešová, Libuše (referee)
The paper describes the development of water quality based on selected pollution indicators in the source catchments of the Berounka River (Mže catchment, Radbuza catchment, Úhlava catchment and Úslava catchment of selected sub-catchments) on profiles located above the water quality monitoring profile Bukovec on the Berounka River from 1981 to 2019. Furthermore, the flow dependence during the monitored period and from it the predominant type of pollution in the given catchment is determined on the basis of the course of regression curves and the value of the coefficient of determination R2 . Based on the average annual concentrations, the evolution of the given pollution indicators on selected profiles is described for the longest possible monitoring period for which water quality data are available. Their evolution within a calendar year can be determined when the flow rate is exceeded. By means of mass transport, the actual amount of pollutants can be determined on the basis of the concentration and the flow rate. The specific mass transport then express the intensity of removal from an area of 1 km2 for a given time interval, which has been chosen here as well as the pollutant loads for one year. The observed results are then converted into graphical output. Based on the data, it is possible to...
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Freshwater bryozoa in Úslava River at localities Starý Plzenec and Koterov
Steinerová, Michaela ; Vymazal, Jan (advisor) ; Magdalena, Magdalena (referee)
Freshwater bryozoans belong to a group of colonial invertebrates. Bryozoa in Czech translation means moss and animal. Representatives of bryozoans, are at first glance very similar to moss and plants from other species differ considerably.
The main objective of this thesis is to determine the different species found in the territories Koterov and Old Plzenec, to check the ecological demands of species found, to evaluate the seasonal dynamics of occurrence bryozoans and to compare the data with the available literature sources.
The monitored stretch of the river Úslava has been divided into 10 sites. Five locations were explored on the Koterov territory and on the territory of Old Plzenec another 5 locations aswell. At both locations, a total of 150 samples of these bryozoans have been collected and determined 233 zoarias.
Total number of 5 species of freshwater bryozoans were founded in the observed area Koterov - Starý Plzenec: Plumatella emarginata (Allman, 1844), Plumatella fungosa (Pallas, 1768), Plumatella repens (Linné, 1758), Fredericella sultana (Blumenbach, 1779) a Paludicella articulata (Ehrenberg, 1831).
Individual species were determined by a synoptical key from athors Wood and Okamura (2005)
From the obtained results, there has been evaluated a seasonal dynamics of the representation of individual species during July, August and September. In addition to the seasonal dynamics, light requirements and preferences of the species and the occurences of particular species were evaluated.
In the Koterov area, Plumatella emarginata has occured most widely, second common type was Plumatella fungosa. There were less abundant species of Fredericella sultana and Paludicella articulata. A type Plumatella repens was found only rarely. on the teritorry of Old Plzenec, most frequently Plumatella fungosa did appear, secondly, Plumatella emarginata. The least recorded species were Plumatella repens and Fredericella sultana.
Most frequently, all the species were occiring on the top and sides of the stones. Plumatela fungosa, Plumatella emarginata and Paludicella articulata were mostly recorded on the upper and lateral sides of the stones. Types Fredericella sultana and Plumatella repens were plentiful on the upper sides of the stones. The reason for this occurrence on the upper side could be a rich food supply. On the flank, the species are probably well protected from predators. The undersides of the stones were inhabitated rarely, probably due to insufficient supply of the oxygen.
My observation of Paludicella articulata being one of the shade-liking species are in line with the findings from the availiable literature . The other species were found both at shaded and sunlit sites and it cannot be percisely determined, if teh lighting conditions have major role in their development.
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