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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
SELECTED ASPECTS OF NEST BIOLOGY OF PODICEPS CRISTATUS IN POND BIOTOPES OF TŘEBOŇ BASIN
 ŠKOLNÍKOVÁ, Hana
The aim of the submitted study was to evaluate the occurrence of great crested grebe (Podiceps cristatus) and its adaptability in the intensively used pond region depending on environmental conditions. The locality under consideration, Nadějská pond system, is situated near the village of Frahelž in Třeboň basin. The investigation was carried out in the years 2007 and 2008, and it was based on periodic counts of Podiceps cristatus on water surface and direct searching for their nests including monitoring of nest parameters. Then the measured parameters were statistically evaluated. In the years 2007 and 2008 the most nests were found on Víra pond or on adjacent ponds (Skutek, Láska). Podiceps cristatus preferred 11 to 20 hectare ponds. 55 % of nests were found in the favoured Typha angustifolia growth, 39 % of nests were found in Bolboschoenus maritimus growth and 5 % of nests in Echinochloa crus-galli growth. Within the years 2007 and 2008 94 nests and 283 eggs were found. The measured parameters of nests and eggs mostly corresponded to literature. In spite of abundance of food, represented mainly by weed species Pseudorasbora parva, and suitable littoral growth a very low success rate in nesting was found. In the year 2007 there was 1 young and in the year 2008 1,06 young for one nesting pair.
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Breedintg biology of great crested grebes (Podiceps cristatus) in different habitats in the Třeboň basin
 HÝLOVÁ, Alena
The aim of this study is to determine some breeding and ethology aspects of Great Crested grebes (Podiceps cristatus) in two different habitats in the Třeboň basin. The first locality is Nadějská rybniční soustava (NRS). It means 14 high eutrophic fish ponds near Třeboň. The second locality is in Hálámky and it is the gravel pits area. There are 4 ponds with low eutrophic water. This locality is similar to lakes - the origin biotope of Great Crested grebes (Podiceps cristatus). There are still active outputs of gravel in some of Halámky ponds. This study is based on breeding aspects, such as bird quantity, observing and measuring. Observations were carried out in 2004 - 2006. Whole day ethology monitoring was made in 2006. The data in Nadějská rybniční soustava are collected every 14 days from March to November. The data in Halámky are collected on the month base. The parameters of nests were measured during the breeding season. It was draught of nests, height above water level, height of water column, diameter of nests, ``kotlinka{\crqq} - a place for eggs in nest, ``korona{\crqq} - a special part of the nest. We focused on the parameters of eggs such as width, length and number of eggs in the nest as well.
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