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Study of the limnological components of the ecosytem of Lake Medard in 2022
Peterka, Jiří ; Hejzlar, Josef ; Nedoma, Jiří ; Znachor, Petr ; Seďa, Jaromír ; Vejřík, Lukáš
The report summarizes the results of research into the limnological and biological components of the ecosystem of the newly created Medard post-mining lake. The aim of the presented report is to summarize the results achieved for the year 2022 and recommendations for further monitoring. The year 2022 was the fifth year after the lake was completely filled, when water from the Ohře River was no longer added. Only small tributaries flowed into the lake from its own catchment area, and at the same time, water from the lake drained through seeps, which are apparently drained into the nearby rivers, the Ohře and the Svatava. The lake ecosystem reached the final state of its initial phase in terms of hydrological regime and nutrient load. This condition is characterized by very little water exchange and a low nutrient level with low productivity of plankton communities. There is the development of submerged macrovegetation in littoral zone and a specific seasonal change in chemistry and biological parameters. However, the aquatic ecosystem is still far from stabilized and the biological communities of the littoral zone (littoral) and open water (pelagial), including the fish community, still show significant interannual dynamics.
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Research report on the occurence and composition of autotrophic communities in Lakes Milada and Most.
Znachor, Petr ; Bešta, Tomáš ; Čapková, Kateřina ; Mareš, Jan ; Řeháková, Klára ; Čtvrtlíková, Martina ; Kučerová, Andrea
The limnological measurement and research of periphyton and aquatic macrophytes were conducted in the framework of 'Strategy AV 21, post-mining landscape restoration' in 2020. Despite the good ecological potential in Lakes Milada and Most, there are several indications of possible future deterioration of water quality (e.g., the occurrence of subsurface cyanobacterial maxima in Lake Most, excessive growth of periphyton mats in both lakes, strong bottom anoxia in Lake Milada).
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Hydrobiological monitoring of Lake Medard in 2020.
Peterka, Jiří ; Hejzlar, Josef ; Nedoma, Jiří ; Znachor, Petr ; Seďa, Jaromír
The aim of this report is to summarize the results achieved in 2020 and make recommendations for further monitoring. The year 2020 was the third year after the full filling of the lake. The lake ecosystem has reached a final state in terms of hydrological regime and nutrient load, which is characterized by very low water turnover, low trophic state with low productivity of planktonic communities, development of submerged macrovegetation in littoral areas and specific seasonal changes in chemistry and biological parameters. However, the aquatic ecosystem is far from being stabilized and the biological communities of the littoral and the open water areas, including the fish community, are still changing considerably from year to year.
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Hydrobiological monitoring of Medard lake in 2019
Hejzlar, Josef ; Nedoma, Jiří ; Znachor, Petr ; Seďa, Jaromír ; Peterka, Jiří
Presented report summarizes the results of hydrobiological monitoring of Medard Lake in 2019 and recommends further monitoring actions. The year 2019 was the second year after the lake was filled, when no more water from the Ohře River was filled and only small tributaries from the small river basin flowed into the lake. Thus, the ecosystem of the lake has reached a final state in terms of hydrological regime and nutrient load, characterized by very low water exchange, low trophic levels with low productivity of planktonic communities, development of submerged macrovegetation in coastal zones and specific seasonal changes in chemistry and biological parameters.
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Hydrobiological monitoring of Medard Lake in 2018
Hejzlar, Josef ; Nedoma, Jiří ; Znachor, Petr ; Seďa, Jaromír ; Peterka, Jiří
Presented report summarizes the results of hydrobiological monitoring of Medard Lake in 2018 and recommends further monitoring actions. The year 2018 was the first year after the lake was filled, when no more water from the Ohře River was filled and only small tributaries from the small river basin flowed into the lake. Thus, the ecosystem of the lake has reached a final state in terms of hydrological regime and nutrient load, characterized by very low water exchange, low trophic levels with low productivity of planktonic communities, development of submerged macrovegetation in coastal zones and specific seasonal changes in chemistry and biological parameters.
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Hydrobiological monitoring of Medard Lake in 2017
Hejzlar, Josef ; Nedoma, Jiří ; Znachor, Petr ; Seďa, Jaromír ; Peterka, Jiří
The report summarizes the results of hydrobiological monitoring of Medard Lake 2017 and contains recommendations for further research activities. At the beginning of 2017, the lake was almost full, and at the end of March the last 30 cm water column was filled from the Ohře river. The ecosystem of the lake has reached its final nutrient load, which will be characterized by low levels of carrying capacity with low productivity planktonic and fish communities and specific seasonal changes in chemistry and biological parameters.
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