National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Primary Succession - study methods and pollen analysis opportunities
Suk, Pavel ; Abraham, Vojtěch (advisor) ; Prach, Jindřich (referee)
This thesis focuses on the main study methods of primary succession. It compares their advantages and disadvantages, the scales of usage and the outputs they bring. Due to the duration of a succession development (in hundreds of years), indirect approach - space-for- time substitution using chronosequences (sites that differ only in age and make up succession series) is often used instead of direct study methods. Breach of the the critical assumption that all sites follow the same trajectory may lead to false conclusions about the successional development. This thesis presents examples showing this problem, ways to prevent it and offers an alternative method - pollen analysis. Pollen analysis is on average used for larger spatial and temporal scales but partially overlaps scales of space-for-time substitution. The thesis presents biases of pollen analysis and ways how to solve/limit them and introduces abandoned, partially flooded quarries as a suitable environment for the use of this method to study succession inferred from rapidly growing limnic sediment.
Is the role of myrmecochory in primary succession on industrial deposits in landscape determined by trophic ant relationships: nectaries/aphids/plant seeds? (a case of legume plants)
Klárová, Magdaléna ; Kovář, Pavel (advisor) ; Štefánek, Michal (referee)
The role of ants in primary vegetation succession is well-known. Ants bring into extreme habitat organic compounds and dispers seeds. However, there is a gap in the knowledge which factors influnce motivation of ants to disperse seeds. One of may hypotheses could be the existence of relationship between myrmecochory and trophic interaction of ants with EFN or aphids. Goal of the bachelor theses is to describe some factors, which could be important for research of relationship between myrmecochory and trophic interaction.

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