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Trends in structure of bird communities in the Czech Republic: from diversity to homogenization?
Prylová, Kristýna ; Reif, Jiří (advisor) ; Kindlmann, Pavel (referee)
Biotic homogenization is a process changing functional structure of ecological communities. Bird communities are changing from homogeneous to diversified primarily because specialist species are replaced by non-specialized species (generalists), and in terms of their ecological functions are becoming more similar to each other. Causes can be both in the current climate change and in human-induced land use changes. Using the community specialization index (CSI), I showed that bird communities in the Czech Republic show a trend towards the higher homogenization over the past 20 years. Effect of climate change has been documented by calculation of the community temperature index (CTI), which reflects the relative proportion of species living in lower and higher teperatures. In contrast to CSI, CTI increased over the same time period. Moreover, I focused on the relationship of homogenization with species richness and compared to the results from other countries, it does not change significantly. The observed phenomena were probably caused by a gradual climatic warming in the Czech Republic, accompanied with more frequent occurrence of other climate change symptoms such as severe storms. A second cause underlying the homogenization could be increasing intensity of agricultural production.
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Evaluation of hutch water monitoring in the vicinity of flooded Turkaňk mine
Prylová, Kristýna ; Datel, Josef (advisor) ; Hrkal, Zbyněk (referee)
Kutná Hora and its outskirts is an area significant for polymetalic ore mining since the Middle Ages. The mining was conducted till 1990s with several interruptions thru history. The latest modern mining operation took place in Turaňk mine, which was reopened in 1950. The production was terminated in 1991 including the operational hutch water pumping. The mine was continuously flooded by groundwater affluents and precipitation water till 2001 and the hutch waters were distinctively enriched with mining elements and compounds of secondary minerals originating from oxidation in opened mine. In 2001 the hutch water overflowed to ancestral adit of 14 adjuncts causing an emergency situation. The hutch water was freely flowing thru the adit to Beránka stream which it contaminated. A hutch-water treatment plant was build consecutively in the area of former ore- preparing plant and pumping of hutch water commenced for the purpose of decreasing water level in Turkaňk hole followed by water decontamination. The plant is currently operational and optimized to maintain stable water level under the spillway to the adit of 14 adjuncts. The ore extraction took place in crystallinic massif of Kaňk hill, which northwest and southeast vicinity is settled with saturated cetraceous and quaternary sediments. These are...
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Trends in structure of bird communities in the Czech Republic: from diversity to homogenization?
Prylová, Kristýna ; Reif, Jiří (advisor) ; Kindlmann, Pavel (referee)
Biotic homogenization is a process changing functional structure of ecological communities. Bird communities are changing from homogeneous to diversified primarily because specialist species are replaced by non-specialized species (generalists), and in terms of their ecological functions are becoming more similar to each other. Causes can be both in the current climate change and in human-induced land use changes. Using the community specialization index (CSI), I showed that bird communities in the Czech Republic show a trend towards the higher homogenization over the past 20 years. Effect of climate change has been documented by calculation of the community temperature index (CTI), which reflects the relative proportion of species living in lower and higher teperatures. In contrast to CSI, CTI increased over the same time period. Moreover, I focused on the relationship of homogenization with species richness and compared to the results from other countries, it does not change significantly. The observed phenomena were probably caused by a gradual climatic warming in the Czech Republic, accompanied with more frequent occurrence of other climate change symptoms such as severe storms. A second cause underlying the homogenization could be increasing intensity of agricultural production.
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