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Analysis of selected aspects of the breeding biology of Great Crested Grebe (\kur{Podiceps cristatus})
MARKOVÁ, Kateřina
The aim of the thesis was monitoring abundance and distribution of nests of Great Crested Grebe (Podiceps cristatus) during the season on the Naděje fishpond system. Further observation included factors that could affect nesting success of the Great Crested Grebe. Attention was concentrated on Wild Duck (Anas platyrhynchos) which is bred by man on the fishpond system and might negatively affect nesting success of Great Crested Grebe. Part of this study was the detailed observation of selected pairs during the nesting season by using camera traps. Temperature measurement in the nests was done by temperature data logger. The investigation was realized on the Naděje fishpond system near the village Frahelž. The research took place from the 14th of April to the 28th of October in 2015. In 2015 were found and investigated 37 nests on the Naděje fishpond system. On the fishpond Skutek were monitored 34 nest, on the fishpond Láska 2 nests and on the fishpond Rod only 1 nest. Majority nests (30) were found on a free surface and 7 nests were situated in the bushy vegetation. Parameters of 111 eggs were obtained altogether. On the fishpond Skutek were found 100 eggs, on fishpond Láska 8 eggs and in the only nest on fishpond Rod 3 eggs. Using the camera traps during the observation proved negative effect of wild duck on Great Crested Grebe nesting. The nest was destroyed group of wild duck. The maximum temperature in the nest reached 33,8 °C.
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The selected aspects of nesting biology of Great Crested Grebe (Podiceps cristatus) in relation to environmental conditions
JEŽKOVÁ, Eva
The aim of the thesis was the appraisal of Great Crested Grebe (Podiceps cristatus) nesting biology aspects in relation to environmental conditions. The research took 6 months from the 2nd of April to the 2nd of October in 2013 and was realised in the Naděje fishpond system on the ponds Víra, Láska, Skutek, Dobrá Vůle, Rod and Naděje. This fishpond system is situated in CHKO Třeboňsko nearby villages Frahelž and Klec and it consists of total of 15 ponds which are used for intensive fish farming, partly for breeding of Wild Ducks for hunting purposes. The counting of birds, active searching of nests and measuring parameters of nests and eggs were carried out during the work. The nests were found on ponds Naděje, Skutek and Láska. In 2013 18 nests were measured altogether. On the fishpond Naděje 8 nests were situated, on the fishpond Láska 4 nests and on the fishpond Skutek 6 nests altogether. 13 nests of the total were found on a free water surface and 5 nests were situated in the vegetations of the Great Reedmace (Typha latifolia) at a maximum distance of 1 m from the free water surface. In 2013 64 eggs were measured altogether. On the fishpond Naděje parameters of 33 eggs were obtained, on the fishpond Láska 17 eggs and on the fishpond Skutek 14 eggs were found altogether.
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The characteristics of Great Crest Grebe (Podiceps cristatus) population in select pond system
JEŽKOVÁ, Eva
The aim of the thesis was the characterictic of breeding population of the Great Crested Grebe on a chosen fishpond system. The research was realised from the 28th of March to the 14th of October in 2011 on the Naděje fishpond systém, specifically on the ponds Víra, Skutek, Láska, Naděje, Dobrá Vůle and Rod. This fishpond system of 15 ponds is situated to the east of the village Frahelž and it´s a part of CHKO Třeboňsko. The data were obtained by regular counting and active searching of nests and measuring their parameters. In 2011 the Great Crested Grebe (Podiceps cristatus) preferred ponds Víra, Skutek and Láska. There were found 70 nests altogether. On the fishpond Víra were measured 36 nests altogether, on the fishpond Skutek 30 nests and on the fishpond Láska 4 nests. In 2011 57 % of nests were found in the vegetation of lesser reedmace (Typha angustifolia) on the fishponds Víra and Láska and 43% of nests in the vegetations of the great reedmace (Typha latifolia). On a free surface just 2 nests were found. In 2011 235 eggs were found altogether. On the fishpond Víra 112 eggs were found, on the fishpond Skutek 105 eggs and on the fishpond Láska 15 eggs. The parameters of size were measured on 182 eggs altogether.
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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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