National Repository of Grey Literature 24 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Degradace mokřadní vegetace na Velkomeziříčsku a možnosti její obnovy
Oulehla, Jan
The thesis deals with degradation of wetland vegetation in the southeastern Bohemian-Moravian Highlands. Based on detailed historical data, a comparison between the historical (20 years ago) and current state of selected wetland sites in the vicinity of Velké Meziříčí town was made. Historical development, current vegetation description and comparison with the historical situation are described for each locality. The results of the work are based on the testimony of witnesses, consultations with the author of the main historical source, maps and own floristic and phytosociological surveys that took place in 2015–2018. 23 sites were resurveyed in total, where 20 of them were found as more or less degraded. Seven of the wetland sites disappeared at all. Furthermore, local extinction is illustrated on six selected endangered wetland species. An integral part is the identification of the causes of degradation, where vegetation succession following the absence of management, drainage and nutrient input (eutrophication) are of the highest importance. Restoration options based on practical examples of good care are described to solve degradation. Phytosociological plots, photographs and lists of found species can be found in the annexes.
Possibilities of ex situ protection of rare and endangered plant species
Vítová, Jana ; Münzbergová, Zuzana (advisor) ; Dostálek, Tomáš (referee)
The aim of the bachelor's thesis is to present the possibilities, significance and possible problems of ex-situ protection for the future conservation of biodiversity of plants on Earth. In the introductory part of the thesis, the individual processes and programs of ex situ protection are described, with the help of literature search. At the same time, information on international cooperation in the field of seed banks and botanical gardens is presented, which, through their activities and mutual cooperation, create rescue programs to secure as many samples of plant material for possible future use. The work also mentions international plant databases, which provide the accurate and detailed information about the preserved material of rare and endangered plant species for the public. Further in the thesis, the currently known problems of ex situ protection with their impacts on the collected and stored material are mapped. Keywords Ex situ conservation, threatened plants, Ministry of the Environment, database, seed dormancy, inbreeding, outbreed depression, cultivation, seed bank, botanical gardens, tissue cultures, in vitro, genetic drift, mutation, hybridization, wildlife conservation, endangered species, threatened species
Reintroduction of butterflies (Lepidoptera)
Štochlová, Tereza ; Sedláček, Ondřej (advisor) ; Straka, Jakub (referee)
The thesis deals with one of the active means of conservation - reintroduction. By this ap- proach, organisms are released in their historical range from which they have disappeared. Re- introductions typically concern vertebrates, that is, however, why this thesis focuses on a group of invertebrates - butterflies (Rhopalocera). The main aim of this work is to carry out a research of previous experiments, evaluate used methods and discover the best way to proceed with reintroduction of butterflies. This process contains many important steps. Firstly, a suitable species must be chosen, that means one that is declining and has limited dispersal abilities. Secondly, an appropriate habitat for releasing organisms must be found - host plants ought to be sufficiently abundant and the area big enough. If the habitat quality is not satisfactory, it can be achieved through management, most commonly by planting host plants, mowing or grazing. Next step is choosing the right donor population. It should be stable, genetically variable, and genetically and ecologically related to the original extinct population. After transfer and release of sufficient number of organisms, it is crucial to carry out a long-term monitoring of the newly formed population and to modify its management when necessary. All methods...
Seed germination and seedling recruitment of Iris sibirica depending on the type of management
This work continue on a bachelor's work which investigated production characteristics of the plant species Siberian Iris (Iris sibirica). The aims of the presented work are reproductive properties by seeds of Siberian Iris in relation to the seed germination and with various meadow managements. Seeds of Siberian Iris (collected in 2015 and 2016) were investigated in laboratory condition and at meadow near the pond Dolní Stržený (Dlouhá Lhota, of the Tábor District). Seeds were divided into groups according to 4 treatments: without intervention, scarification, thermal stratification and cold stratification. The field experiment runs from September 2016 to August 2017.The aim was to find out the most appropriate type of management (mowing, disturbance) that would promote seed germination and seedling recruitment. Results from the both experiments: a positive effect of germination after the scarification, better recruitment of seeds in square without intervention, seeds probably needs to be stored for a longer period before sowing. These results cannot be generalized, because small number of repetitions were performed. All the obtained data was discussed and recommendations for the plant management were formulated.
Population viability analysis of endangered species in Czech Republic
Šťastná, Andrea ; Helman, Karel (advisor) ; Bašta, Milan (referee)
Diploma thesis analyzes the viability of the selected species populations in the Czech Republic. The thesis is divided into two main parts. The first part contains a stochastic model simulating possible scenarios of the Eurasian lynx population size in the Czech Republic. For this model program Vortex was used. The second part is focused on Time series analysis of the Grey Partridge and the Common Kingfisher population, where data was obtained from the Czech Society for Ornithology. This analysis aims on identification of factors that may affect the viability of the two bird species.
Diversity and taxonomy of Steccherinum in the Czech Republic
Geigerová, Tereza ; Koukol, Ondřej (advisor) ; Borovička, Jan (referee)
This thesis deals with geographical distribution and taxonomy of Steccherinum genus in the Czech Republic. Members of this genus are corticioid fungi of Meruliaceae family, characterized by odontioid hymenophore, small spores and encrusted pseudocystidia. Presence of nine species was confirmed in Czech Republic on the basis of herbarium specimen revision and study of my own collections. Analysis of ITS and LSU nrDNA gene regions was used to create phylogenetic trees. These trees show relations in Steccherinum genus and related species. Selected traits in specimens of S. ochraceum s. l. (number of spines, their length, spore size and pseudocystidia size) were measured. This was followed by investigation of morphological variability in individual specimens and in relationship to ecological conditions (substrate and elevation). Morphology of selected individuals was compared with molecular data afterwards. Two clades were defined in S. ochraceum s. l. - existing differences between them are presumably caused by intraspecific genetic variability. S. rhois could not be separated as individual species on the basis of phylogenetic analysis. Dependence of fruiting body morphology on ecological conditions wasn't supported by results. Maps of geographic distribution of individual species of Steccherinum genus are...
Human preference to animal species and its impact on species conservation
Marešová, Jana ; Frynta, Daniel (advisor) ; Komárek, Stanislav (referee) ; Sedláček, František (referee)
The dissertation thesis deals with human aesthetic preference to other species and its anthropological and conservation aspect. The aesthetic preference to animal species has rarely been systematically studied before and quantitative analyses, especially on a fine taxonomic scale did not exist. On the other hand, it was known that attractive species often receive more support for their conservation. From these simple facts rose the idea to test human aesthetic preference to snake species (and consequently to species across major vertebrate taxa) and use this quantified preference to explain the conservation effort devoted to captive breeding worldwide (measured as size of zoo populations). We confirmed that the perceived attractiveness (preference and/or species' body size) succesfully predicts the size of zoo populations across mammal, bird and reptile taxa. On contrary, we found no effect of the IUCN listing of the species. To find out whether we work with Czech students' preference only or we may generalize to other populations, we carried out the same experiment to determine human preference to boas and pythons in eight cultures of five continents. Despite profound differences of the studied ethnics, we revealed a considerable agreement. Moreover, we found an agreement between pre-school...
Commented translation: Petit atlas des especes menacées (Yves Sciama, Petite encyclopédie Larousse, Paris 2003, str. 96-119)
Sýkorová, Eliška ; Belisová, Šárka (advisor) ; Šotolová, Jovanka (referee)
This translation bachelor thesis consists of a practical and a theoretical part. The practical part is the translation of a chosen chapter from the book Petit Atlas des Espces Menacées, written by a French biologist and publicist Yves Sciama. The theoretical one is a commentary on the translation which engages in analysis of the original text - it studies the character of the author, the intended reader, the edition in which the book was released, etc. Next the commentary describes the typology of translational problems on the lexical, syntactic, stylistic, grammatical, and text level. It is followed by a discussion over the method of translation and characteristics of the used translational techniques (transposition, modulation, concentration) supported by concrete examples. It is concluded by a description of graphical design of the text.
The effect of different management strategies on the dynamics of saproxylic insect habitats
ŠEBEK, Pavel
The thesis concerns studies on habitats utilized by insects associated with deadwood. It presents a review of current issues in the conservation of saproxylic biodiversity. The effects of active intervention on temperate lowland woodland habitats, such as pollarding or coppicing, are evaluated in terms of their suitability for saproxylic communities and other groups. Further, the importance of open-grown trees for saproxylic diversity is assessed.

National Repository of Grey Literature : 24 records found   1 - 10nextend  jump to record:
Interested in being notified about new results for this query?
Subscribe to the RSS feed.