|
|
Chrysophycean cysts and scales in paleolimnological studies
Bartošová, Kateřina ; Němcová, Yvonne (advisor) ; Škaloudová, Magda (referee)
This thesis deals with chrysophyte scales and stomatocysts as useful tool of paleoecological reconstructions in lake ecosystems. In the first part the geological physical and biological aspects of lake reconstructions are described. The second part contents information about chrysophyte taxa and their utilisation as paleoekological indicators. Chrysophyte microphosils include two major groups of siliceous indicator: stomatocysts and sculptured and ornamented species-specific scales. Using surface-sediment training sets, quantitative inference models have been constructed for eutrophication, acidification, air-born pollution, salinification, climatic change, and other environmental changes. This thesis represents a literature review.
|
|
|
Observation of annual water level changes on lakes in High Tatra Mts.
Sankotová, Tereza ; Šobr, Miroslav (advisor) ; Janský, Bohumír (referee)
The presented thesis deals with annual lake level fluctuation in the High Tatra Mountains. It focuses on the related issue of the hydrological regime of lakes and the process of observation of level fluctuation depending on the genetic type of a lake. On the basis of the available literature, the thesis aims to determine the causes of annual changes in the level fluctuation and to compare these with other alpine lakes. The findings are applied to the lake level fluctuation data originating from the Skalnaté pleso and Hincové Oká. Through a comparison of level fluctuation of lakes in the High Tatra Mountains and the Šumava Mountains significant differences in the annual running of lake levels were found. By contrast, the comparison with the lakes in glacial area, whose hydrological regime is dependent on other physical-geographical factors, show that the annual running level fluctuations are similar. Key words: High Tatra Mountains, lake, hydrological regime
|
|
|
Phytoplankton of the Tatra lakes: factors influencing taxonomic composition and biomass
Červenková, Lenka ; Nedbalová, Linda (advisor) ; Štefková, Elena (referee)
The aim of this diploma thesis was to describe species composition and biomass of phytoplankton in the Tatra Mountains lakes (Slovakia, Poland) and environmental factors influencing them. The surface layer of 89 lakes was sampled in September 2004. Flagellates from Chrysophyta, Dinophyta and Cryptophyta most frequently dominated the phytoplankton biomass. Lake in the same valley usually differed in their dominant taxonomic group as a result of different lake morphometry, catchment type and detailed geological structure. Based on the level of phytoplankton biovolume, the majority of lakes were ultraoligotrophic and oligotrophic, however, mesotrophic and even eutrophic conditions were recorded in some forest and meadow lakes. An allometric relationship between phytoplankton biomass and chlorophyll a was revealed. Specific chlorophyll content did not differ among taxonomic groups. Altogether 233 species were determined, the most diverse group were Chlorophyta. Species richness of lake was 3-46 and it was negatively correlated with altitude and positively correlated with lake area. The majority of species were rare both in term of biomass and number of lakes occupied by a particular species. Average local species biomass was positively correlated with regional distribution. The similarity of species...
|
|
|
The use of diatoms (Bacillariophyta) in paleolimnology
Aubrechtová, Martina ; Píšková, Anna (referee) ; Kulichová, Jana (advisor)
This thesis is a literature review summarizing methodology and the possibility of use of diatoms (Bacillariophyta) for paleoecological reconstructions of extinct lacustrine ecosystems. In addition, the theoretical part of the thesis is devoted to basic characteristics, evolutionary history and ecology of the group, lakes and the fossil record. In the practical part, two samples of sediments of a fossil lake that has been discovered and studied within the Morava Project in Strážnické Pomoraví are compared.
|
|
|
Detached house on a lake
Sedláčková, Markéta ; Vránová, Lenka (referee) ; Kacálek, Petr (advisor)
The subject matter of my Bachelor thesis is the project of a new single-family detached house situated on a lake. The building has two over-ground floors and is covered by a flat double-coated roof. Spacious terraces accessible from both the first as well as the second floor are the integral parts thereof. Vertical load bearing and non-load bearing walls are designed from Porotherm walling system. Horizontal load bearing ceiling constructions are designed from an iron-concrete construction. The load bearing first floor terrace construction shall consist of a welded steel construction. The large diameter piles foundation construction is designed from an iron-concrete construction. The wall footing construction of piles, load bearing pillars and slab floating the building construction is designed from underwater iron-concrete construction. The project emphasizes the layout plan, thermal technical properties and safety in use.
|
|
|
The impact of new water area on microclimate
Bartůňková, Kristýna ; Sokol, Zbyněk
In this contribution the impact of new water area on local climate is studied. The area of interest is newly originated lake Most in northern Bohemia. The impacts on microclimate that are evoked by physic-geographical changes in the area are studied by the help of the NWP model COSMO. The part of this model is Lake Model FLake. Input data are measured at the meteorological observatory Kopisty and at the lake station that measures also the water temperature in 16 vertical levels to the depth of 20 m. First results show significant influence of lake existence on air temperature, especially in summer months (June, July and August). The maximum influence is 1.2°C cooling in the surface level of the atmosphere. With the rising distance from the surface the impact on air temperature is decreasing.
|
|
|
Fish detection with modern sonar systems
TUŠER, Michal
This dissertation thesis was focused on improving the methodology to detect fish with modern sonar systems in lakes and reservoirs. The first part of the thesis is aimed to the vertical beaming acoustics with a key focus on the acoustic dead zone and its practical solution. The second part deals with the fish orientation in reservoir?s open waters and its consequences in horizontal beaming acoustics. The last one dedicates to the DIDSON multi-beam sonar and its reliability in detection and sizing of fish.
|
|
| |
|
|
Piscicultural and Environmental Aspects of the Revitalization of the Návežný Pond
ČERNÝ, Pavel
The aim of this thesis was to document the various stages of restoration Návežný Pond ? ?Návesný? in the cadastral Branišov. The revitalization was used Operating Environment Programme, Priority Axis 6.4. - Optimization of the landscape. The hydrological parameters were monitored pond dredging, restoration of security overflow and bypass sewer. The revitalization was to increase the retention capacity of the pond using pond sediment extraction and subsequently by increased flood protection. Another important part of the revitalization is to restore the old defunct sewer bypass construction and safety overflow for the flood. Dredging is important to perform due to animal hygiene pond environment, biodiversity ecosystem pond, retention pond production capability and protection against floods. Due to the long-term return on investment is appropriate to use financial aid as grants. For the evaluation of most subsidies have been compared three grant degrees.
|
|
|
Bottom soils in the rhizospheres of quillworts in the Czech Republic Bohemian Forest
Husák, Štěpán
The bottom soil from the rhizosphere of both quillwort species (Isoëtes lacustris and I. echinospera) was sampled in the Plešné and Černé lakes in the Bohemian Forest by C. Weilner and his collaborators (1996, 1998) and by M. Böhm (2002), and analysed in the chemical laboratory of the Institute of Botany, Czech Academy of Sciences, Průhonice (see Tab. 1.). The results of chemical analyses from the three years are comparable with smoothly increasing values. Only the potassium concentrations decreased from 116.25 mg.kg-1in 1996 to 5.75 mg.kg-1 in 2002 in Plešné Lake. This decrease can be explained by greater flushing of the sediments from the cirque walls into the stands of Isoëtes echinospora, in 1996. From 2004 to 2006 the bottom soils from Isoëtes stands will be analysed twice per year, with more samples from the Isoëtes stands. Nutrients will also be assessed on the radient between the Isoëtes stands and the shores of both lakes.
|
guest ::
