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Abrupt cooling events in the Late Glacial and the Early Holocene
Švanda, Petr ; Vondrák, Daniel (advisor) ; Tichá, Anna (referee)
This bachelor thesis is prepared in the form of a literature review focused on abrupt cooling events in the Late Glacial Interstadial and the Early Holocene (14 700 to 8 200 cal. BP). The aim was to summarize the scientific knowledge on six such climate fluctuations and their causes and consequences. All of these events (GI-1d, GI-1c2, GI-1b, 11 400 event, 9 300 evenet, 8 200 event) lasted more than 50 years and are followed by cooling of more than 1 řC. Literature sources on this topic are based on interdisciplinary studies of various natural archives and the interpretation of so-called proxy data. For each climatic event, an assessment of its effects on ecosystems and human societies at the time was also made. The above findings are finally discussed in the context of the current climate change issues and the possible future of weakening the Atlantic Meridional Overturnig Circulation.
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Factors affecting pollen transfer effectiveness
Švanda, Petr ; Štenc, Jakub (advisor) ; Straka, Jakub (referee)
Pollen transfer efficiency, i.e., the proportion of pollen that is successfully transferred to a plant of the same species, significantly affects plant reproductive biology and creates a potentially strong selection pressure for the development of specialized strategies to increase pollen transfer efficiency. Precisely because of its importance within pollination biology, the efficiency of pollen transfer was a frequent subject of studies, in which, however, its interpretation differed depending on the method used, making it difficult to compare individual studies. Moreover, the work to date does not offer a satisfactory methodological framework for comparing the effectiveness of pollen transfer across the studied systems. The effectiveness of pollinators is primarily affected by the amount of pollen removed, the amount and quality of pollen deposited and frequency of pollinator visits. These factors are affected by additional influences, for example the behavior of the pollinator, the number of open flowers within the inflorescence or the environment variability. The result of this work is the retrieval of a methodological framework capable of determining and comparing the relevance of pollinators to pollen trasffer across plant species, which will be possible to link with theoretical models...
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Evaluation of the quality of service from the perspective of parents in street hockey - category mini-mite team and mine team.
Švanda, Petr ; Ruda, Tomáš (advisor) ; Šíma, Jan (referee)
Title: Evaluation of the quality of services from the perspective of parents in street hockey - category mini-mite team and mite team Objectives: The main goal of this thesis is to evaluate the level of quality of services provided by extra-league street hockey clubs throughout the Czech Republic from the perspective of parents as customers in the categories of mini-mite teams and mite teams with subsequent delivery of recommendations to improve these services to increase the overall level of service and the attractiveness of the stated sport for children. Methods: The obtained data are collected based on a standardized SERVQUAL questionnaire, used to measure the quality of services provided and respondents' satisfaction. The questionnaire was distributed to 12 extra-league street hockey clubs in a form of online questionnaire through representatives of these clubs who directly send it to the parents of 357 children falling into the category of mini-mite team and mite team. Results: Based on the survey, it was possible to identify gaps within the basic five categories (according to the SERVQUAL methodology - material security, reliability, responsible approach, sense of security, empathy), where the highest gap reached belonged to the category reliability, followed by material security. The...
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