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Hydrobiologie poříčních tůní dolního Podyjí v souvislosti s obnovou hydrologického režimu lužního lesa
Heteša, Jiří ; Keršner, Vladimír ; Marvan, Petr ; Sukop, I.
Alluvial pools of Lower Dyje River Basin were markedly affected by river bed canalisation and construction of three shallow reservoirs in seventies and eighties. As a consequence of groundwater decrease many periodic pools became extinct and survival of numerous plant and animal species in the whole complex of floodplain forest seriously endangered. On the other hand, other species, like e.g. halophilous diatoms, appeared and found convenient living conditions in waters with increased electrolyte concentration. River water supply into pools suffering from lack of water is associated with risks of lowering indigenous biodiversity and introducing undesirable organisms, especially water bloom forming cyanobacteria.
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Systém říčních ramen a aluviálních tůní vysoké Arktidy
Elster, Josef
During last ten years the ecology of shallow streams, rivers and poolsin newly deglaciated areas of the High Arctic (Ellesmere Island - CanadianArctic, Svalbard - Norwegian Arctic archipelago) and the Antarctica (KingGeorge Island, South Shetland) was studied. Cyanobacteria and eukaryoticalgae, frequently produce visible biomass and, play an important role inthese biocenoses.At the end of glacial period (about 18 thousand years ago) the area ofthe Czech Republic was surrounded by glaciers (from north - the continentalglaciation, and from the south - the Alpine glaciation). The north and thesouth glacial masses strongly influenced the ecosystem of this area, and canbe compared with the polar areas which are, at present time, influenced byclimate change.The ecology of alluvial pools discussed on the conference were and, innear future, has to be compared with results which are available from theshallow wetland ecosystem of polar regions.
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Seeking for Achilles heel of cyanobacteria
Maršálek, Blahoslav
Factors determining cyanobacterial success in aquatic ecosystems will be discussed and explained in the light of a complex environmental facrors and consequences. Special attention will be given on the nine main single-factors theories from the literature, which may explain cyanobacterial success: (TN/TP hypothesis, low light hypothesis, high light/low pH hypothesis, the buoyanvy hypothesis, elevated water temperature hypothesis, zooplankton grazing hypothesis, the storage strategy hypothesis, the inorganic nitrogen hypothesis and trace element hypothesis).Application of these single-factors hypotheses in a restoration programs provide ussually no significant success. We believe, that the combination of these hypotheses can more realistically explain the complex environmental facrors and consequences determining cyanobacterial success in aquatic ecosystems.
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Řasová sbírka - banka tesovacích kmenů sinic a řas
Lukavský, Jaromír
Culture collections, including algal, facilitate experiments and teaching by a speedy delivery of determined and pure cultures of required strains. There are about 7 000 strains in ca 50 algal collection over the world. The most easy body of information about some strains is in world dbase of World Federation of Culture Collections of Microorganisms : http://wdcm.nig.ac.jp/
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Miniaturizovaný řasový biotest
Lukavský, Jaromír
Growth algal bioassay is based on long-term cultivation of a testing alga with tested substance in nutrient solution, or in a sample from nature. The bioassay is at least 3 generations and also chronic affects or influence of repruction process can be so detected. The yield of biomass of testing alga in a sample from nature represent the maximal biomass which could be expected in nature without limitation with light, temperature, CO2 and predation.Miniaturized bioassay is exploating cultivation of algae in wells of an immunological plate in volumes of 0.2 ml. In a plate 9x13 cm, there are 96 wells which enables us to expose 10 samples every in 6 replicates, 2x25 plates in a cultivation unit of size of a common table has capacity of 3 000 miniaturized cultures. Their filling, inoculation and evaluation can be facilitated with a great spectrum of tools and equipments for immunological assays.
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