National Repository of Grey Literature 77 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Changes of landscape structure and scattered greenery in the Jistebnicko region
Štěpán, Jan ; Lipský, Zdeněk (advisor) ; Romportl, Dušan (referee)
The landscape has been profoundly affected by human activity for centuries and the consequences of this interference have been growing in scale with the rising demands of modern society. The processes leading to the landscape's homogeneity, or, on the other hand, its fragmentation, have been focus of many studies which then allow us to understand how the landscape functions in its entirety and are also significant for the process of spatial planning on the local level. The aim of this theses is to assess the changes done to land cover an landscape's (micro)structure with special focus on scattered greenery (non-forest woody vegetation), as well as to examine how these changes have been mapped into the cadastral municipality of Cunkov, located in the Jistebnická vrchovina highlands, throughout the last 180 years. It is then possible to analyze these changes using the GIS and historical materials from three time periods which were beforehand selected - the years 1840, 1953 and 2019. Microstructure of the landscape plays an essential role in landscape's dynamics and for its ecologic stability.
Changes of landscape structure in the different landscape types
Lebduška, Lukáš ; Romportl, Dušan (advisor) ; Chuman, Tomáš (referee)
Landscape structure is affected by combination of human and natural influences. Changes, which took place in landscape structure of Czechia depends on degree and intensity of human influence in different types of landscape. This work was devoted to problematics of landscape structure changes, which took place between years 1950 and 2018, and how did they affected the landscape microstructure and land cover in different landscape types. These changes were computed in model location of 1x1 km in size, set by random selection in landscape types. These model locations were compared based on aerial photography from fifties of twentieth century and from year 2018, and on their basis were computed landscape metrics and analysed land cover. The changes which took place in these locations were the compared. The calculations had proved the difference in change of landscape structure, especially by homogenization of landscape. In these changes are evident differences, specific for each landscape type. Keywords: landscape structure, landscape heterogeneity, land-use, landscape metrics, change of landscape
An anthropogenic transformation of the natural sphere of Africa
Píšová, Šárka ; Romportl, Dušan (advisor) ; Kliment, Zdeněk (referee)
Africa is a heterogeneous environment that is affected by natural and anthropogenic processes. This thesis uses a review method to characterize the natural environment of the continent, present possible classifications of natural conditions and to describe the transformation of this environment. The main methodological aim of the thesis was to determine areas threatened by biodiversity loss due to anthropogenic pressures based on a new classification of the natural environment on a continental level. This was executed by methods of environmental stratification and subsequent environmental classification. Thus, this thesis presents a classification of the natural environment on the basis of homogenous units determined by bioclimatic variables and terrain, which are subsequently related to the biodiversity of birds, amphibians and mammals and to an anthropogenic influence represented by anthropogenic biomes. Finally, the share of protected areas is executed in relation to this anthropogenic transformation of the natural environment. Therefore, the thesis is quite a unique approach, as it takes into account a combination of both physical and socio-economic factors at a continental level. The final output consists of a map of the anthropogenic transformation of Africa's natural environment in the...
Habitat connectivity of large carnivores in the Romanian Carpathians
Janoušková, Eliška ; Romportl, Dušan (advisor) ; Zýka, Vladimír (referee)
This bachelor thesis deals with the landscape connectivity and the progressing phenomenon of fragmentation, which prevents animals from moving in the landscape. The issue of connectivity of the landscape is a current theme of nature protection, given the dynamic development of new roads and highways. The aim of this work is to identify the core areas of large carnivores in the model area of the Romanian part of the Western Carpathians and their interconnection through migration corridors. Based on the findings of the brown bear, wolf and lynx and environmental factors, the suitability of the environment for the occurrence of these carnivores was evaluated using the Maxent habitat model. Using the Linkage mapper tool, potential migration corridors between core occurrence areas have been identified based on the lowest cost paths. The results confirm that bear, wolf and lynx prefer areas with little anthropogenic alteration. For this reason, their occurrence and maintenance of genetic variability depends on landscape connectivity. Key words: landscape permeability - landscape fragmentation - large carnivores - Carpathians
Landscape structure and its differences among landscapes in the Czech Republic
Duspiva, Marek ; Chuman, Tomáš (advisor) ; Romportl, Dušan (referee)
Landscape structure has a major influence on functioning and processes in a landscape. The landscape structure is highly dependents on the natural conditions and economic use of the landscape. This thesis devotes to general theoretical issues of landscape ecology, especially landscape structure and its evaluation. The main aim of the thesis was to analyze the landscape structure in landscape types of the Czech Republic and to evaluate whether these types differ in the structure. Landscape structure analysis was performed using landscape metrics calculations based on CORINE Land Cover data. Landscape structure can be characterized by a large number of metrics. The following metrics were selected for the analysis and description of landscape types: Patch density (PD), Mean patch size (MPS), Edge density (ED), Shannon's Diversity Index (SHDI) and Shannon's Evenness Index (SHEI). The metrics were calculated for the whole area of each landscape type and also for all squares 2 km x 2 km covering the whole area of the Czech Republic. Although used data have a relatively low resolution, the calculations and the analysis of variance have shown that the character of the landscape structure differs between the individual landscape types. Keywords: landscape ecology, landscape structure, landscape structure...
The European Greenbelt - landsdcape structure and connectivity
Andrš, Vojtěch ; Romportl, Dušan (advisor) ; Chuman, Tomáš (referee)
European Green Belt, a biological corridor and a remnant of the Iron Curtain, intersecting Europe from the north to the south and extending from the shores of Barents Sea to the shores of the Mediterranean and Black Sea, is utterly unique phenomenon not only because its diversity, position and extend. By the fall of the Iron Curtain in 1989 significant fragmentation of this area has begun. In this thesis a literature research of landscape connectivity and structure was done. Development of landscape structure in the area of European Green Belt from 1990 to present and its fragmentation was compared in practical part of the thesis. Key words: European Green Belt, landscape structure, landscape fragmentation, landscape connectivity
Habitat dynamics of Tawny pipit on the coal dumps in Northern Bohemia
Bernhäuserová, Veronika ; Romportl, Dušan (advisor) ; Chuman, Tomáš (referee)
Surface mining and its associated territory disturbance is generally perceived negatively by society. However, these newly transformed regions may be very important areas of conservation from biodiversity point of view of and emergence of refugia. This thesis investigates the dynamics of the coal dumps and the land cover changes in relation to the occurrence of endangered species of Tawny pipit (Anthus campestris) in the North Bohemia. This area is the only breeding region in the country for this species. The aim of this thesis is to describe land cover change on three coal dumps (Tušimice, Bílina a Vršany) within horizon of four years (2014, 2015, 2016 and 2017). Moreover, another aim was to asses habitat preferences of Tawny pipit based on ornithological findings for particular year. As it is seen from the results, the most significant change occurred at those areas, which were without vegetation cover in the beggining of monitoring and were cover with vegetation later. The category of herbal vegetation was the one which increased the most, as it was caused by spontaneous succession. It showed up that Tawny pipit's most preferred areas are land cover categories coal dumps surface without vegetation, coal dumps surface with herbal vegetation and category buildings, build-up area and transport...
Modeling of potential distribution of beaver in watershed of the river Mže
Procházková, Zuzana ; Romportl, Dušan (advisor) ; Matějček, Tomáš (referee)
Diploma thesis is focused on habitat requirements of European beaver (Castor fiber) and conflicts arising thereof in the catchment area of the river Mže. Based on current occurence the potential distribution of this species is predicted. In the introductory part the model species and his habitat requierements are described. Further attention is given to occurence of European beaver in the area of the Czech republic with emphasis on the catchment area of the river Mže. On the basis of know data concerning occurence of European beaver in the area of interest the potentional distribution of beaver is evaluated based on habitat requirements using programmes ArcGIS 10.2 and MAXENT 3.3. These results are supported by terrain mapping in selected areas. Tables, grafs and thematic maps , which clearly represent the results, are part of submitted thesis. Thus, the main aim of the thesis is to describe habibat requirements of European beaver, predict his future spreding in the catchment area of river Mže and identify possible conflict zones. Keywords: the Eurasian beaver, Castor fiber, Mže river, habitat modeling, MaxEnt
Habitat preferences of red deer in the Giant Mountains NP
Hazdrová, Kristýna ; Romportl, Dušan (advisor) ; Lipský, Zdeněk (referee)
The thesis deals with the evaluation of habitat preferences of the red deer in the Krkonoše National Park. In the context of Central Europe, the Krkonoše Mountains are an important locality in which many rare and protected ecosystems are located. The current management is trying to restore the species composition of the forest, which was abundant in the past and replaced by atypical spruce species. Red deer (Cervus elaphus), which lives in these forests, has no natural enemy in the Giant Mountains, so it is necessary to control the local population and perform selective management for the purpose of forest protection. For proper management planning it is important to know the life strategies of the red deer: the deer's preffered habitat, physical-geographical characteristics that affect its movement and spatio- temporal use of the area. This information can be obtained through GPS-telemetry collar monitoring. The monitoring campaign in the Giant Mountains was carried out between 2014 and 2018 and the resulting data are used in this work. Information on 71 individuals of red deer are processed and subjected to spatio-temporal analysis, which shows that deer behavior is influenced by both daily and annual cycles. Another aspect influencing its movement is the density and intensity of the use of...
Use of remote sensing data for monitoring of long-term vegetation dynamics on the landscape scale
Brůna, Josef ; Wild, Jan (advisor) ; Romportl, Dušan (referee) ; Kropáček, Jan (referee)
This thesis deals with the use of remote sensing data for studying and monitoring vegetation changes. Thanks to archival materials, we can now make extensive studies at the landscape and global level without the need for large-scale old field data. From the Middle Ages, we can rely on different types of maps, for vegetation studies, these are mainly forestry maps. Since the 1930's, aerial photographs have been available in Europe, and satellite imagery was available since the 1970's. Availability and quality of satellite imagery had increased rapidly during my study. The most recent data source are unmanned aerial systems and methods of processing their data, which allow inexpensive detailed mapping of large areas. The presented publications do not only solve ecological research questions, but also contribute to solving current environmental problems in the Czech Republic, from nature conservation in National Parks and protected areas to monitoring of plant invasions. I have used archival forest maps for the reconstruction and analysis of large disturbances (windthrow and subsequent gradations of bark beetle) in forests of Šumava and the Bavarian Forest in 1868-1870. Species composition, as well as environmental factors derived from digital elevation model, were analyzed. The same topic was also...

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