Proefschrift Universiteit van Amsterdam. / Met lit.opg. - Met samenvatting in het Nederlands.

No description available.

No description available.

No description available.

Proefschrift Universiteit van Amsterdam. / Met lit. opg. - Met samenvatting in het Nederlands.

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.

One of today's major environmental issues is algal blooms linked to eutrophication of lakes and oceans. That is a result of anthropogenic influence with nutrient loads (including phosphorus) from agriculture and industry, which benefits primary production (phytoplankton). Studies have shown that phosphorus availability in the water column can be limited by liming, therefore could be a way to counteract eutrophication. This was tested in the agriculturally surrounded lake Tåkern in southern Sweden, which in its present state is an internationally important bird lake and therefore in several respects would be affected by eutrophication. The purpose of this study was to investigate whether liming would be a good solution to solve any future eutrophication problems in Lake Tåkern. Liming experiments were performed in mesocosms during April 2015 with a mixture of limestone and slaked lime. Quantity and diversity of plankton and water chemical variables were measured before and after liming. Moreover, samples of phytoplankton from a similar experiment conducted in July 2014 were analyzed. Liming did not show any effect on neither phyto- nor zooplankton when performed in spring of 2015. During summer of 2014, there was an increase in number of phytoplankton (ml-1 ) and chlorophyll in controls while the study showed constant levels in treated mesocosms. For zooplankton there was no significant effects of liming on neither quantity nor diversity. Results of this study suggest that liming is not the most appropriate method to resolve eutrophication in Lake Tåkern.

Thesis (doctoral)--Rijksuniversiteit Groningen, 1996. / Includes bibliographical references (p. [109]-119).

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.

The aim of this study was to use pigments to determine freshwater phytoplankton composition . The samples were collected from freshwater lakes in the Czech Republic and Germany. The pigment analyses were conducted using the High Performance Liquid Chromatography (HPLC). The HPLC data were processed by computer program CHEMTAX to calculate the composition of phytoplankton. The obtained pigment data were compared with standard light microscopy which was used to obtain more detailed taxonomic resolution.