The diploma program summarized in this paper was to evaluate the habitats of Gentianella Praecox, subsp. Bohemica, in the Chvalšiny and Český Krumlov areas where the taxon can be encountered on eight sites. The narrative section, summarizing the biological and ecological aspects of the species, provides also information on why the taxon is endangered and how it can be protected. A special chapter is dedicated to the program of its recovery. The methodological section, characterizing the area of interest and its different sites, describes also the procedure applied to create and evaluate phytocoenological relevés. The chapter is complemented with information on the numbers of plants in bloom, a figure representing the communities of Gentianella praecox, subsp. bohemica, as found at the individual habitats. Statistical evaluations of the phytocoenological relevés revealed, inter alia, a certain change in the species composition and coverage, primarily on all sites at Svatý Kříž (Chvalšiny). The change observed in these habitats manifested itself also through the increase in coverage of the more mesic species of Plantago lanceolata, Achillea millefolium, and Lotus corniculatus. The numbers of individual plants of Gentianella praecox, subsp. bohemica, encountered in bloom showed substantial year-on-year fluctuation.

The thesis deals with phenotypic, ploidy and genetic variation of two Campanula species occurring in the Krkonoše Mts., namely the endemic C. bohemica and widespread C. rotundifolia subsp. rotundifolia. For comparative purposes subspecies sudetica of the latter species was also included. The main aim was to get insight into population structure and assess the threat of interspecific hybridization to the survival of the endemic bluebell. Flow cytometry, distance-based morphometrics and molecular analysis were used to address these questions. Three distinct groups of fluorescence intensities were revealed by flow cytometry, corresponding to DNA diploids, tetraploids and pentaploids. While diploids morphologically matched the nominate subspecies of C. rotundifolia, tetraploids corresponded either to C. rotundifolia subsp. sudetica or C. bohemica. Most populations from the Krkonoše Mts. were uniform although a sympatric growth of diploids and tetraploids was encountered in 12 populations. Only two pentaploids individuals, most likely of hybrid origin, were found, which indicated that interspecific hybridization is much less common than previously assumed. The two tetraploid taxa were distinguished by molecular markers. A combination of flow cytometry and molecular analyses thus allowed reliable...

Fallopiajaponica (Houtt.) Ronse Decraene (Japanese knotweed), an introduced, invasive, rhizomatous perennial plant, has become an increasing problem for nature conservation and land management in both rural and urban areas in the British Isles. In the native range of the plant, Japan, Taiwan and northern China, a number of varieties are recorded. Three congeners of F. japonica are present in the British Isles, F. sachalinensis, F. japonica var. conipacta and F. baldschuanica in addition to a hybrid F. x bohemica. An investigation by postal survey of the distribution of the hybrid F. x bohemica has identified 131 records for the British Isles. Both male and female plants of F. x bohemica have been recorded. Current understanding suggests that only female plants of F. japonica are present in the British Isles, inferring that the only means of reproduction is through vegetative regeneration. High rates of regeneration were recorded in this study for stem and rhizome material for both F. japonica and F. x bohemica in an aquatic and terrestrial environment. Implications of vegetative regeneration are discussed in terms of current management practices and future methods of control. A combination of digging with a mechanical excavator followed by spraying with the herbicide glyphosate decreased the time required to achieve an effective level of control of F. japonica compared to spraying alone. Fragmentation of the rhizome system through digging resulted in an increase in stem density allowing a more effective delivery of herbicide. Implications in terms of costs for F. japonica treatment on sites awaiting re-development are discussed. Analysis of data collated from surveys of F. japonica in Swansea using a Geographical Information System suggest that the primary habitats infested are waste ground and stream and river banks. Results suggest that disturbance, both by natural means and by human intervention has been the primary cause of spread of F. japonica in the British Isles. Management strategies are proposed which take account of these results and measures are put forward to help prevent future infestations.

Reynoutria spp. rank among highly invasive taxa in the Czech Republic. Therefore, a considerable effort is focused on its eradication. This is usually done by application of non- selective herbicide based on glyphosate. However, only little is known about the spontaneous recovery of the native vegetation after the eradication, as well as whether the restoration can be facilitated by additional management. In my master thesis I (i) describe the process of restoration after Reynoutria spp. eradication, (ii) evaluate the influence of factors which could potentially inhibit the succession (such as glyphosate, allelopathy, changes in soil conditions due to Reynoutria spp. invasion), and (iii) evaluate the influence of native-species seed addition on establishment of target plant communities. The process of vegetation recovery was followed on 17 sites in a forest and in ruderal forest-free area from 2007 to 2010. Over the three years of the study, the sites in the forest- free area were covered by diverse vegetation, secondary succession on sites in a forest progressed more slowly. Any soil changes were detected. The process of succession was limited probably because a dead biomass was left on the sites after the eradication. The seed addition was also not crucial for the restoration of plant communitites.

This diploma thesis called "The analysis of selected choral compositions by Jakub Jan Ryba" deals primarily with his religious works. The introductory chapter briefly describes Ryba's journey to music and the activity of a composer and the text is also based on Ryba's own biography published in 2005 titled My Life and Music. The thesis concerns an extant autographic list of his works dated to 1801 and an autographic fragment of an incipit catalogue of compositions dated from 1774 to 1796 including an incipit of Czech Christmas Mass "Hey, Master!" dated back to 1795. Both lists were compared with two electronic music databases: the catalogue of the department of music history, National Museum - the Czech Museum of Music and the musical incipit catalogue of the National Library of the Czech Republic. The electronic databases were further compared with the thematic catalogue which is a part of the monography titled Jakub Jan Ryba published in 1963. The object of interest was also the quantity of autographs and transcripts and the prints of the works by Jakub Jan Ryba which have been issued from the beginning of the 19th century till present. Regarding the results of the research, it was proved that only a part of Ryba's work has survived up till now since Ryba himself presents 1083 compositions, both...