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Population trends of forest birds in Czechia
Szarvas, Filip ; Reif, Jiří (advisor) ; Hofmeister, Jan (referee)
Currently, most scientific attention focused on bird population trends is centred on birds in the agricultural landscape. Forest bird research, on the other hand, is given far less space, despite the fact that forests in Europe often form a substantial part of the landscape in some parts. Moreover, it is undergoing drastic changes throughout Europe, and especially in the Czech Republic. In the second half of the 20th century, their quality deteriorated due to air pollution, later regenerated, but other additional challenges have emerged, such as global climate change and epidemics of wood-destroying insects. It is therefore possible to assume their fundamental influence on forest bird populations. However, most of the work examining the effects of the forest environment and forest management on bird populations is only very local, limited to ecologically valuable, and therefore quite specific, habitats, or covering only a small number of bird species. However, data on the evolution of forest birds vary across Europe. In Finland, for example, forest birds are declining, while in neighbouring Sweden the trend is the opposite. In this study, I aim to better map what characteristics of forests affect specific species of birds, in research conducted throughout the Czech Republic. I decided to explore...
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Long-term changes in numbers of selected waterbirds in different types of wetlands
Šenkýřová, Adéla ; Musilová, Zuzana (advisor) ; Vojar, Jiří (referee)
The aim of this study is an analysis of long-term changes in numbers of 28 selected waterbird species wintering at 4 different types of wetland refuge sites (reservoirs, fishponds, industrial waters and running waters) monitored within the International Waterbird Census between 1966 and 2015. We aimed to evaluate the pattern in water type preference and determine if there is a difference in number trends of particular species at different refuge sites types and if there are any variations according to the presumable existence of density dependance at wintering refuge sites.
Results showed an increasing preference in waterbirds wintering at industrial waters (sandpit and gravel lakes, industrial settling ponds) over running waters. Rather herbivorous, benthivorous and omnivorous species than pescivorous species prefer industrial waters, which is probably caused by a lower concentration of fish in industrial waters than in other water types. Waterbird species of lower count numbers and northern species showed a higher preference for wintering at reservoirs over running water sites. The preference change leads to the density dependence of wintering sites confirmation.
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