The construction of new roads has many negative consequences for the environment, among others also increasing of the fragmentation of landscapes. One of the precautions to reduce the impact of these negative consequences for the environment is the construction of ecoducts. The question is whether the currently built ecoducts in the Czech Republic are functioning and whether the funds spent to reduce the negative impacts of road constructions are spent effectively. This thesis discusses the ecoducts of the Prague road ring. At the end of 2015, there were already completed seven ecoducts at the whole road ring. Their dimensional characteristics were ascertained by measuring, the soil on ecodusts was compared with the soil on the immediate surroundings and the assessment of the condition of the vegetation on the ecodustc was done. The results suggest that ecoducts the Prague road ring have many drawbacks and their efficiency is reduced due to their inappropriate solution.

Landscape permeability is currently significantly decreasing mainly due to anthropogenic barriers - transportation infrastructure and sub/urban development. The construction of these barriers has various environmental impacts on animals that differ among taxa. Ensuring a certain degree of permeability of the landscape is crucial for the survival of many species of organisms. Effective tools for the planning protection and restoration of the permeability of the landscape are series of models, whose theoretical framework and practical use are described in this thesis. The practical part deals with the modeling of changes in landscape permeability in the southern hinterlands of Prague. The effectiveness of the implemeted mitigation measures is also evaluated. Keywords: landscape fragmentation, landscape permeability, ecoducts, mitigation measures, suburbanization