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Autumn Eurasian Crane (\kur{Grus grus}) migration passage across the Czech Republic with special focus on the south-west Bohemia region
MILLEROVÁ, Adéla
The common crane (Grus grus) is a migratory bird which was earlier considered as a rarely migrating kind in the Czech Republic. Currently here migrate up to several thousand individuals of common crane. Common cranes in Europe use two main migration routes - eastern and western. The eastern migration route runs from Finland and north-west of Russia through Hungary to northern Africa. The west migration route, which is also used by cranes nesting in the Czech Republic, runs from Norway, Sweden and Finland through Germany and France to Spain. During the migration, cranes stop at a gathering point where they have a rest and search for food. One of the best-known gathering points of common cranes is located in Hungarian national park Hortobágy. Phenology of migration is generally influenced by a broad spectrum of factors. In the last decade distinct changes of migration behaviour of this kind have been recorded. It probably comes to interconnection between eastern and western migration routes. A part of common cranes deviates from the eastern migration route, and at the same time migrates through the Czech Republic and connects to the western migration route. The aim of this work was to work out an overview of phenology of migration and to analyse available data on the migration of cranes in Southwestern Bohemia and adjoining areas (Bavaria, Upper Austria). The results show that it comes to increase in numbers of observed individuals of cranes in Southwestern Bohemia. When migrating through our territory, the cranes mostly prefer north-western flight direction. These results show that it probably comes to interconnecting of the eastern and western migration route. The average date of cranes passing through our territory over the years 2010 to 2019 has not changed demonstrably. The average daily temperature had a marginally significant effect on the passage of individuals of common cranes through our territory. The number of individuals passing through our territory between the census dates in the Hortobágy national park was demonstrably influenced by the date (period) of the passage.
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Live food organisms for fish - an overview
MILLEROVÁ, Adéla
Feeding organisms are an important part of the fish's nutrition, they are used not only when foddering fish larvae, but also as a supplementary feed for adult fish. The addition of animal and vegetal ingredients in the feed of fish has a proven effect on their growth, reproduction, condition and the intensity of their coloration. To the group of feeding organisms used in fishkeeping belong protozoans, rotifers, crustaceans, nematodes, oligochaetes, molluscs and insects. A specific group of feeding organisms are algae and cyanobacteria, which are used not only as a supplementary feed for aquarium fish, but also as a food for some feeding organisms, for example rotifers, cladocera and copepods. The individual chapters of the thesis contain information about the usage of these specific organisms in fishkeeping, basic characteristics (size, occurrence, eventually also reproduction), breeding in home conditions (inclusive the list of needed things, advantages, disadvantages and the costs of breeding), also the method of obtaining and preservation of this specific type of nutriment.
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