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	Spatial variability in population structure of wintering Ducks Prokešová, Erika ; Musil, Petr (advisor) ; Hořák, David (referee) 5 Abstract This thesis is aimed at spatial variability of population structure of our four most common and the most numerous species of ducks wintering in the Czech Republic. These analysed species are Mallard (Anas platyrhynchos), Tufted duck (Aythya fuligula), Common Merganser (Mergus merganser) and Northern Goldeneye (Bucephala clangula). The field data were collected by January International Waterbird Census in the Czech Republic between 2004 and 2013. Analysed habitat variables include: type of wetland, altitude, population size, level of urbanisation (size of settlement) and mean January air temperature in the investigated site. There was found no significant effect of type of wetland and local population density on population structure in any of these bird species. The next factor, altitude of sites was confirmed as significant only for Mallards, when increasing altitude decreased proportion of males in the population. Furthermore, effect of urbanization was found also in Mallard, when proportions of males increased with level of urbanization, i.e. in larger cities. Finally, , temperature of sites was confirmed to be significant factor affecting population size in the three analyzed species, i.e. in Mallard, Tufted Duck and Northern Goldeneye. Except Common Merganser, ratio of males grew with... Detailed record
	Increasing of density of the goldeneye population (\kur{Bucephala clangula}) by using artificial nest boxes SKLÁŘOVÁ, Kateřina In the autumn 2013 were set up 50 nest boxes for increasing of density of the Common Goldeneye population (Bucephala clangula) in Třeboň region. The main objectives of this study were to check the nest boxes after breeding season and analyse the results. These nest boxes were checked in the July 2014 and 2015. In the spring 2015 were set up 2 mobile scouting cameras to the selected nest boxes. There was also monitor the occurrence of the Common Goldeney on the Naděje fishpond system and Prátr fishpond system by counting. The Naděje fishpond system is created by 16 different sized fishponds and it is situated approximately 8.5 km to the south of the town Veselí nad Lužnicí. The Prátr fishpond system is situated approximately 1 km to the south of the town Třeboň and it is created by 9 fishponds. The monitor was realised in term from 17. 3. 2015 to 27. 7. 2015. The other species of water birds were also counted. In the year 2014 10 nest boxes were occupied and in the year 2015 17 nest boxes were occupied. The nest boxes which were located on the fishpond´s islands were preferred. Both of the mobile scouting cameras recorded European Pine Marten (Martes martes) devastating the nest. The Common Goldeneye was occurred on the both fishpond systems in 2015. In the year 2015 was observed the female of the Common Goldeneye with 8 ducklings on the Prátr fishpond system. Detailed record
	Nesting populations of Common Goldeneye (\kur{Bucephala clangula}) at selected pond systems SKLÁŘOVÁ, Kateřina The main objectives of this study were to monitor the occurrence of the Common Goldeneye (\kur{Bucephala clangula}) in nesting season on the chosen fishpond systems with a view to find out their proven nesting. The research was realised on the Naděje fishpond system and Prátr fishpond system in term from 22. 3. 2013 to 16. 8. 2013 by counting and active searching of nests. The Naděje fishpond system is situated approximately 15 km to the north of the town Třeboň beetwen the villages Klec and Frahelž and it is created by 16 different sized fishponds. The Prátr fishpond system is created by 9 fishponds and it´s situated approximately 1 km to the south of the town Třeboň. The other species of water birds were also counted. The Common Goldeneye was occurred on the both fishpond systems in 2013 only in spring and nesting of this species wasn´t proved. The most common species on the Naděje fishpond system was the Great Crested Gelbe (\kur{Podiceps cristatus}) and on the Prátr fishpond system it was The Common Pochard (\kur{Aythya ferina}). Detailed record

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