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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Hnízdní preference jiřičky obecné (Delichon urbica) v urbánní krajině
 Dvořáková, Denisa
The thesis evaluates the birdlife preferences of the common house martin in the territory of the Czech Republic. The survey of the literature focuses on obtaining information from available sources that relate to nesting preferences according to different criteria, such as environmental habitat conditions, influence of the human factor, and others. In the practical part of the thesis 12094 records have been collected concerning the nesting of the common house martin in the Czech Republic in the period from 2009 to 2017, drawn from the faunistic database of the Czech Society for Ornithology. The data was correlated with the data on the conditions found in the separate habitats and analysed by the statistical methods Boosted regression trees (BRT) and Generalized Least Squares (GLS). The obtained results show that owing to the insect life the common house martin most prefers the areas with field and wetland ecosystems, and rather also the suburban lowland region. A major negative influence on the common house martin appeared to be mining areas in industrial estate.
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Diversity and ecology of arboreal ant communities in a tropical lowland forest
 KLIMEŠ, Petr
The thesis focuses on the study of arboreal ant communities in a highly diverse tropical rainforest in Papua New Guinea. In the first study of its kind, whole patches of forest were sampled extensively for ants foraging and nesting in tree trunks and canopies. An extraordinary amount of material collected from 684 felled trees and 260 bait stations in plots of primary and secondary forest was used to study the mechanisms structuring the diversity and species coexistence of this ecologically important insect group at the local scale. The first chapter addresses the question "Why are ant communities more species rich in primary than in secondary forests?" and explores the main environmental traits that influence their diversity in tropical trees. The second chapter compares the community diversity and composition and nesting preferences of ant species between both forest types. The final third chapter introduces a novel method, involving large-scale manipulation of ant communities that could serve as a template for future studies focused on complex tropical food-webs of canopy arthropods and plants. In summary, the results of the thesis highlight the importance of primary vegetation in conserving the diversity of native ant communities and the relevance of nesting microhabitats and their turnover between trees, rather than tree taxonomic diversity, for sustaining the diverse arboreal fauna in tropical forests.
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