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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
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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