National Repository of Grey Literature 394 records found  beginprevious258 - 267nextend  jump to record: Search took 0.01 seconds. 
Winter teritoriality im passerines in relation to environmental and climatic conditions
Glückseligová, Pavla ; Musil, Petr (advisor) ; Reif, Jiří (referee)
This thesis is focused on winter territoriality of passerines. It summarizes general knowledge of territories, territorial behaviour and broader knowledge about winter territoriality. Winter social behaviour of individual species, their territoriality, migratory strategy and food preferences were summarized for Western Palearctic bird species. Furthermore, effect of climate change on passerines and their migratory behaviour, timing of breeding and their relationship to food abundance and conspecific competition. In the last chapter, there is discussed effect of climate change on species displaying wintering territoriality. Increasing temperature can affect food availability, competition for sources and consequently reproduction success.
Freshwater wetlands as a biogeochemical archive: Temporal changes in climate and environmental records
Zemanová, Leona ; Novák, Martin (advisor) ; Mihaljevič, Martin (referee) ; Hojdová, Marie (referee)
Worldwide, peatlands cover an area of 4.106 km2 . Plant primary production dominated over organic matter decomposition and enabled organic matter to accumulate during the last 11 000 years. Peatlands represent a reservoir of atmospheric carbon and they are a useful scientific tool for reconstructions of historical atmospheric pollution. The first part of the thesis focuses on peatlands as a dynamic carbon reservoir under predicted climate change that would influence carbon cycling and emissions of greenhouse gases into the atmosphere. Three methodological approaches were used - a mesocosm laboratory incubation, a transplant experiment and in situ gas flux measurements. The laboratory incubation studied the response of peat samples from temperate (Velké Dářko, Czech Republic) and boreal (Stor Åmyran, Sweden) zone to a temperature increase, water table decrease and their combination. Today, the warmer site exhibits ~14 times higher CH4 production potential than the colder site (28 mg m-2 hr-1 at VD, and 2 mg m-2 hr-1 at SA). Both sites respond differently to temperature increases. Changes in methane production were up to 9 fold due to different temperatures. A gradual decrease of water table level from 2 to 14 cm below the peat surface had a much stronger effect, VD exhibited a decrease in methane...
Role of aerosol in climate change
Švátora, Milan ; Hůnová, Iva (advisor) ; Hovorka, Jan (referee)
Atmospheric aerosol is a suspension of liquid or solid particles or their mixture in the atmosphere. Tropospheric aerosols can get into the air from its natural sources or from anthropogenic sources. Release of carbon dioxide from burning fossil fuels and organic and elemental carbon from biomass burning are the major anthropogenic sources of aerosols. Primary aerosols have a direct source of emissions (dust from quarries or from land, sea salt particles in the waves, volcanic ash during volcanic eruptions). Secondary aerosols are formed by chemical reactions of substances in the atmosphere, which converts the gas particles - so- called conversion of gases to particles (formation of nitrates by oxidation of nitrogen oxides and sulfates from sulfur dioxide). Atmospheric aerosol is an important component of the atmosphere and contributes to significant atmospheric events, such as precipitation formation and precipation fall, radiation balance of Earth. Aerosols can affect the radiation balance of the Earth in two ways. First, through absorption and scattering of shortwave and long wave radiation - so-called direct effect. Or serve as condensation nuclei on which water is condenses. Aerosols can affect formation, quantity, length of existence and radiation properties of clouds - so-called indirect effect. In...
Transformation of geopolitical importance of Arctic Ocean due to climate change.
Doboš, Bohumil ; Romancov, Michael (advisor) ; Plechanovová, Běla (referee)
Work describes and predicts future development in geopolitical situation in the region of the Arctic Ocean. Problematic is covered with regard to melting of the Arctic iceberg leading to access of mineral resources under the sea floor, as well as to opening of so-called Northern Route as the shortest sea route between Far East and European markets. Thesis is a case study, which creates the most probable development in the region and its conflict potential based on study of available sources. Specific points covered in the text are, after geographically limiting the area and summing up the historical process, problematic of peak oil and sketching probability of melting of the Arctic iceberg. Second part covers the question of recovering of the mineral resources in the area - oil and natural gas as the most important. It also deals with dependence of the countries in the area on the drilling and with impacts of the possible drilling in the Arctic Ocean on the situation inside these countries. Last topic covered in this part are tools a conventions of the sea law dealing with setting of so-called Exclusive economic zones and technical difficulties of the mining process. Third part covers topic of availability of Northern Route and North-west Passage and their fallout on the trade between Far East and Europe...
Protection of the Earth climate system from the legal point of view
Radošinský, Adrián ; Žákovská, Karolina (advisor) ; Sobotka, Michal (referee)
Climate system protection from the legal point of view The global warming is one of the most serious and acute problem, that is touching all the global society. Growing of the greenhouse gasses is evoking the change of climate system, especially the warming of the Atmosphere and the Earth. In the last 100 years the temperature rises, what cause a lot of problems not just on the environment, but impacts on human health and society. Many of recent scientist studies clearly indicate, that climate changes are a result of human activities. Consequences of the global warming have been observed for several years, included rising global average temperature, rising of the sea level, melting glaciers and severity of extremes such as heat waves, cold waves, storms, floods and droughts. To preclude this consequences, there is necessary a global action with participation of every country. The aim of the diploma thesis is an introduction to the reader create a picture of the functioning of the climate system and its changes, causes and consequences of these changes and clarify the activities to protect, whether it is the activities of international, multinational or the Czech Republic. Finally, I will try to assess the individual activities and measures, including measures of adaptation, or to compare them and...
Protection of the Earth climate system from the legal point of view
Babka, Tomáš ; Žákovská, Karolina (advisor) ; Franková, Martina (referee)
Climate system protection from the legal point of view Climate change seems to be a defining ecological issue of the 21st century. However, unlike other global threats there are still some scientific uncertainties about the gravity of this problem and its actual consequences. On the other hand the proven fact is that the Earth climate is affected by altered atmospheric concentrations of greenhouse gases. Dozens of recent studies clearly indicate that the changes in the atmosphere are a result of human activities and that an immediate action is needed to reduce greenhouse gas emissions and avoid reaching more harmful levels. If nothing is happened, climate change would lead to a rise in global average temperature together with other associated impacts such as melting glaciers, rising sea-levels or more frequent appearence of extreme weather events. The climate change issue is being addressed both at international and national level. There is a need to take a coordinated action of all states worldwide with respect to their development capabilities and historic responsibilities. International negotiations in last couple of years have shown that it will be very difficult to achieve an agreement between countries with different intrests. The aim of this diploma thesis is to summarize a development of the...
Palaeocology of plant-arthropod associations from the Lower Miocene of the Most Basin in northern Bohemia (Czech Republic)
Knor, Stanislav ; Prokop, Jakub (advisor) ; Teodoridis, Vasilis (referee)
Terrestrial plants and insects account for the majority of the Earth's biodiversity today, and almost half of all insect species are herbivores. Thus, insects and plants share ancient associations date back for more than 400 million years. However, investigation of their interactions stands largely at the beginning in Western Europe. Nearly 4300 plant remains showing various kinds of feeding damages are available for the present study. These trace fossils are classified as so-called functional feeding-groups supply an outstanding example of the complexity, the structure and the changes of terrestrial ecosystems, are not well known during this interval. In Europe, the Neogene is characterized by palaeogeographic re- organization due to the collision of the African with the Eurasian plates. The Neogene plant record in Europe is rich and diverse offering a profound large-scale understanding of the floristic and vegetational development. A database of fossil traces from the Most Basin was compiled and analyzed by various statistical methods in terms of the diversity and intensity of palaeo-herbivory. The primary objective is to present results on the development of insect herbivory through the section of the Bílina Mine in North Bohemia, with the aim of understanding principal factors that caused the...
Climate Change
CENIA, česká informační agentura životního prostředí
Environmental issues of the Czech Republic are presented in set of 18 monothematic leaflets (in Czech and English).
Fulltext: Download fulltextPDF; Download fulltextPDF
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.

National Repository of Grey Literature : 394 records found   beginprevious258 - 267nextend  jump to record:
Interested in being notified about new results for this query?
Subscribe to the RSS feed.