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Hydrobiological monitoring of Duchcov selected ponds.
Typoltová, Tereza ; Pecharová, Emilie (advisor) ; Martin, Martin (referee)
Since the year 2013 there is going a hydrobiology monitoring of some selected ponds in Duchcov. It is Rybochovný n. 1, Rybochovný n. 2, Rybochovný n. 3, Kravský, Růžový, Dubský and Barbora onces, when all ponds were for some time monitored in basic hydrochemical parameters: temperature, alkalinity, conductivity, oxidation reduction potential, dissolved oxygen concentration in water, transparency and turbidity. I examined seasonal change in phytoplankton and zooplankton composition. I compared my results with data from previous years. In these ponds is a risk of eutrophication, resulting in the occurrence of algal blooms. Several situations with the occurrence of algal bloom was observed during monitoring. This would may be problem for ecological conditions of pond´s reservoirs, also for fish composition because of oxygen out-pumping. There weren´t noticed extreme changes during pH monitoring, even so it is important to monitor the supply of nutrients and in case of deflection to make various steps.
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Plankton of small village ponds
ČEJNOVÁ, Monika
The object of my thesis was to document the basic characteristics of four small ponds. Register seasonal changes in the occurrence of selected zooplankton groups and compare individual ponds among them. Then evaluate management on ponds and assess the possible impact on the formation of plankton. These results were then compared with the current situation on standard economic ponds. In this study, I observed three private ponds and local pond, which were located in the cadastral area Lodhéřov. From the results it is evident, that the zooplankton development was in private ponds very slow, while at local pond was developed zooplankton quickly. The diversity of zooplankton species was higher in local pond. On private ponds showed a high increase in fish, which amounted to R1 597 kg/ha and R3 519 kg/ha. In terms of management of ponds R2 was the least effective because the gain was only 113 kg/ha. Private ponds, according to the average annual ration 2910 kg/ha still ranked in halfintesification, while local pond to intensification ration with 4557 kg/ha.
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Biology and ecology of invasive species bryozoan Pectinatella magnifica
SKUHROVEC, Tomáš
Biology and ecology of invasive species bryozoan Pectinatella magnifica The aim of this bachelor theses is to create a literary overview containing available information about biology and ecology of the species Pectinatella magnifica. This invasive bryozoan originates from North America. Its occurrence in the Czech Republic was first recorded in the 30s of the twentieth century around the rivers Labe and Vltava. However its first massive presence was reported in the year 2003 in the sand pit Cep in the national protected landscape area Třeboňsko. From the reservoir Cep, it spread into other locations (sand pits Cep I, Vlkov, Veselí, Veselí I., Horusice and into ponds Hejtman, Nový Kanclíř, Staňkovský and Podřezaný, where it found suitable conditions for its life. It can be found in other locations in the Czech Republic as well, but its occurrence does not reach such big amounts. Outside our country it can be found in other European states and in some Asian countries. Pectinatella magnifica is a colonial fresh water animal preferring asexual reproduction. The colonies have yellow and brown colour, a structure of a hard gelatine and a spherical or oblong shape. Pectinatella magnifica is an effective filter feeding invertebrate, its diet consists of phytoplankton, especially diatoms. The most significant ecological factor effecting its seasonal dynamics is the temperature, as it is a thermophilic species preferring the optimal temperature of 20°C. If the temperature sinks bellow 20°C, the colonies start to decline and the hibernating units, called statoblasts, are released. Pectinatella magnifica tends to occur in slightly alkaline fresh water with a lower conductivity (bellow 200 S.cm-1). Regarding the trophy, water, qualified from oligotrophic to mesotrophic, is suitable for Pectinatella magnifica. It is found especially on submerged branches and on driftwood in the areas of river banks. Within this species, the association with other water animals has been proved, for example with small crustaceans and snails. In the cavity of coelom, the sexual evolution of parasitic species Trichonosema and Tetracapsula has been proved, these species represent a group of significant parasites of salmonids. To be able to estimate and describe the influence of this species, recently spreading in biotopes, which it inhabits, it is necessary to get acquainted with its biology.
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Příspěvek k poznání vegetace sinic a řas vodních biotopů na Nepomucku
HAZUKOVÁ, Václava
The algological research was conducted in the surroundings of Nepomuk. In total, 9 fishponds and 2 streams were investigated over two years. Samples of net phytoplankton, periphyton and phytobenthos were collected in spring, summer and autumn. Moreover, various environmental variables were measured at each sampling site. Specimens were identified to the lowest taxonomic level possible and the relative abundance was assessed. Seasonal fluctuations and changes in the species composition among sampling sites were compared and discussed. The influence of environmental variables on changes in planktic and benthic assemblies was analysed. The list of species and the photodocumentation are presented.
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Dynamika rozvoje fytoplanktonu Brněnské přehrady v závislosti na podmínkách prostředí
Straková, Lucie
My PhD. thesis is dealing with the problem of excessive blooms of cyanobacteria at the Brno reservoir. Due to the constant supply of nutrients, this recreation area is faced with the problem of eutrophication for many years. Partial solution was found after thorough limnological research and the first interventions carried out in 2008. Project started with the application of lime on exposed shore which was followed by the coagulation of phosphorus by ferric sulphate and installation of aeration equipment in water column. Part of the measure was the change of the fish stock as well. This project followed the whole process from 2006 to 2011. Water samples were taken from a motor boat at three localities. Physico - chemical parameters of water (pH, dissolved oxygen, water temperature) and amount of chlorophyll were measured in situ by FlouroProbe and YSI Probe. Microscopic analysis of phytoplankton performed in living samples or after fixing with formaldehyde. Our results show significant changes in the composition of phytoplankton biomass and reduce the number of cells per ml of water. New conditions in the aquatic environment are reflected especially during the vegetation seasons 2010 and 2011. Also new results from summer 2012 confirm the effectiveness of this project.
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Study of seasonal changes of water quality in Vír reservoir
Navrátilová, Martina ; Dolejš, Petr (referee) ; Chocholáčová, Hana (advisor)
Thesis deals with measuring of chosen indicators of water quality in Vír reservoir (temperature, pH, colour, turbidity, fluorescence of fykocyanin, concentration of chlorofyl-a, pheopigments, microcystin-LR, orthophosphates, nitrates, etc.). Samples were taken from the sampling profiles 10, 30 a 50 metres from absolute level and in the season from May to October was direct in reservoir measured a vertical profile by a multifunction sonde YSI 6600.
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Removal of different species of phytoplankton by dissolved air flotation
Sukopová, Martina ; Mega, Jaroslav (referee) ; Dolejš, Petr (advisor)
The work evaluates the efficiency of dissolved air flotation (DAF) in removal of various kinds of phytoplankton. As absolutely necessary in the process of water treatment proved the agglomeration phase, or coagulation and floculation. This phase neutralizes the particles so that they can fasten air bubbles. The efficiency of this process depends on several variables, though: the kind of coagulant used, dose, coagulation pH, duration of floculation and its intensity, recycle ratio and the polymer use in coagulation. The particle size volume distribution and the volume of organic matter in raw water also have certain influence on phytoplankton removal. Dissolved air flotation is currently the most suitable method of phytoplankton removal. It can remove 93-98 % of blue-green algae and even 99-99.9 % of algae. The efficiency of flotation was also compared to sedimentation for the economic reason. In the process of water treatment, the sedimentation is now being replaced by flotation.
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Kvalita vody a složení planktonních společenstev vodní nádrže Opatovice
Hylák, Tomáš
The aim of the diploma thesis was a seven month research at the valley waterworks reservoir called Opatovice by Vyškov na Moravě. Taking of the water samples was carried out once a month from two sampling places, which were located on the leeward and windward sides. On the same day these water samples were analyzed at the Fishery and Hydrobiology Department of the Mendel Univerzity in Brno, where there were determined physical and chemical parameters of water, quantitative and qualitative content of the plankton associations. The results were compared with my bachelor thesis: The Development of the Quality of Water in the waterworks reservoir Opatovice, with the results from the previous years, which were provided by the Water Supply and Sewerage company, plc in Vyškov, with the valid legislation of the Czech Republic and with selected waterworks reservoirs situated in the south Moravian region.
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Spatial heterogeneity of diatom silicification and growth in a eutrophic reservoir
VISOCKÁ, Veronika
Silification and growth rates of diatoms were measured at two distinct sites along the longitudinal profile of the canyon-shaped eutrophic Římov Reservoir during April?November 2011, at 1?3 week intervals. Over the study season, the most abundant diatom species were Asterionella formosa and Fragilaria crotonensis, while Aulacoseira italica, Nitzschia acicularis, Synedra acus and Stephanodiscus sp. were less important. Silica deposition measured via PDMPO fluorescence technique was significantly related to growth rates of three diatom species (Fragilaria crotonensis, Asterionella formosa, Aulacoseira italica). Growth rates of the two most abundant diatom species were positively correlated with daily light exposure but not with nutrient concentrations.
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