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Issue Definitions in the Agenda-Setting of the European Union
Ullrichová, Eliška ; Tomalová, Eliška (advisor) ; Dias, Vanda Rafaela Amaro (referee) ; Pinheiro, Rómulo (referee)
Agenda-setting dynamics are widely acknowledged as a combination of issue definitions and venues. Although venues have been receiving significant scholarly attention, the concept of issue definition is poorly developed and lacks operationalization. This PhD thesis therefore offers an analytical framework for issue definition encompassing three attributes (substance, salience, and framing), drawing on the interdisciplinary agenda-setting literature and interconnecting the debate of issue definitions with issue hierarchization. The proposed framework aims to contribute to the punctuated equilibrium theory by identifying what issues are defined through negative feedback (self-corrective mechanisms) and what issues are through positive feedback (shifts). The agenda of the European Council from 2014 to 2022 (the last two constellations of the European Union) is analyzed by applying the qualitative methodological approach. The findings show that the effect of positive feedback determines primary issues, i.e., the most salient issues on the agenda, and that negative feedback is connected to issues at all positions within the issue hierarchization, i.e., the negative feedback also generates primary issues. The research exposes that the feedback determining issue definitions influences which issues are on...
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Plant-soil feedback as a mechanism affect species diverzity of communities
Vondráková, Zuzana ; Münzbergová, Zuzana (advisor) ; Janoušková, Martina (referee)
Plant-soil feedback is known as the interaction between plant and soil. There is the feedback, when plant affect soil during their roots and on the other side soil affect growth and development through the change of their biotic and abiotic conditions. The plant-soil feedback is important mechanism of affecting plants or their competitive plant species through the soil. In this thesis I would like to summarize the functioning of the plant-soil feedback and factors which influence the feedback, the effect of feedback on the species diversity of plant communities, role in secondary succession, invasion and during coexistence of different species. I would like to point out, in which cases this feedback was confirmed experimentally and which experimental methods are used in the study of plant-soil feedback.
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Plant-soil feedback as a mechanism affect species diverzity of communities
Vondráková, Zuzana ; Münzbergová, Zuzana (advisor) ; Janoušková, Martina (referee)
Plant-soil feedback is known as the interaction between plant and soil. There is the feedback, when plant affect soil during their roots and on the other side soil affect growth and development through the change of their biotic and abiotic conditions. The plant-soil feedback is important mechanism of affecting plants or their competitive plant species through the soil. In this thesis I would like to summarize the functioning of the plant-soil feedback and factors which influence the feedback, the effect of feedback on the species diversity of plant communities, role in secondary succession, invasion and during coexistence of different species. I would like to point out, in which cases this feedback was confirmed experimentally and which experimental methods are used in the study of plant-soil feedback.
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