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Calcium volume and ratio effect in food of freshwater pearl mussel (Margaritifera margaritifera) on its survival and growth rate
Macháček, Vojtěch ; Horáčková, Jitka (advisor) ; Tichá, Kamila (referee)
The freshwater pearl mussel (Margaritifera margaritifera) is a protected critically endangered species in the Czech Republic, whose juvenile stages are currently unable to survive and grow on many streams, partly due to the absence of quality food with sufficient calcium supply. Pearl mussels only live in oligotrophic rivers and streams, which are generally poor in calcium. However, they need enough calcium in their food, as they use it, among other things, to build a hard shell. It is not yet clear in what form pearl mussels take calcium in their diet, but it is clear that some of its forms are a key factor for the growth and survival of juveniles. We therefore focused on the study of various forms of organic calcium in their diet (fine particulate organic matter, further shortened as "detritus") and further feeding experiments to evaluate their suitability. Within this work, detritus was collected in thirty-five localities in the upper Vltava and Blanice river basins in three seasons in two years. Samples originated both from main river channels, their tributaries and springs. Afterwards, two organic forms of calcium in the samples - citrate and oxalate - were quantified. Then, twenty localities with different contents of both forms of calcium were selected from the tested samples, from which...
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Impact of habitat diversity and wood debris accumulation on macroinvertebrates
Nováková, Barbora ; Matoušková, Milada (advisor) ; Rödlová, Sylva (referee)
The revitalization of watercourses should be amended to restore the natural landscape water regime. Healthly waterflow should contain a morphologically rich bed with added dead wood and alternating pools and riffle. All these structures are colonized by varied fauna, that is distributed according to its dietary requirements. These problems are devoted to the research part of work. Another part is focused on the research of three tributaries in the upper basin of Blanice river near Prachatice. The location is thanks to the population of the freshwater pearl mussel (Margaritifera margaritifera), significant not only in Czech but also in european scale. Therefore, there is an important aspect of environmental protection. Given the importance of the site, there are experimental research carried out by Department of Physical Geography and Geoecology at the Faculty of Charles University in Prague. The practical part is based on the determination of macroinvertebrates revitalized Sviňovického brook and the subsequent evaluation of water quality. Samples of macroinvertebrate were collected using method PERLA and subsequently identified in families. For use BMWP score and ASPT index, the quality of water placed in the appropriate category of water quality.
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Impact of habitat diversity and wood debris accumulation on macroinvertebrates
Nováková, Barbora ; Matoušková, Milada (advisor) ; Rödlová, Sylva (referee)
The revitalization of watercourses should be amended to restore the natural landscape water regime. Healthly waterflow should contain a morphologically rich bed with added dead wood and alternating pools and riffle. All these structures are colonized by varied fauna, that is distributed according to its dietary requirements. These problems are devoted to the research part of work. Another part is focused on the research of three tributaries in the upper basin of Blanice river near Prachatice. The location is thanks to the population of the freshwater pearl mussel (Margaritifera margaritifera), significant not only in Czech but also in european scale. Therefore, there is an important aspect of environmental protection. Given the importance of the site, there are experimental research carried out by Department of Physical Geography and Geoecology at the Faculty of Charles University in Prague. The practical part is based on the determination of macroinvertebrates revitalized Sviňovického brook and the subsequent evaluation of water quality. Samples of macroinvertebrate were collected using method PERLA and subsequently identified in families. For use BMWP score and ASPT index, the quality of water placed in the appropriate category of water quality.
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Analysis of selected localities suitability for freshwater pearl mussel young stages in upper stretch of Vltava River
Myslivečková, Lenka ; Bílý, Michal (advisor) ; Alena, Alena (referee)
In the river basins of Teplá Vltava and Blanice in Šumava, samples of floating and deposited detritus were taken for the purpose of their physical and chemical analysis with the goal to identify suitable stations for the growth and development of juvenile specimen of freshwater pearl mussels. 6 locations in total were examined (5 in the river basin of Teplá Vltava, 1 in the river basin of Blanice) where bio-indicator tests were also conducted. In all these locations, samples were taken 3 times during the month of July and, in 1 location, once a month in the period from June to November. In the samples, the amount of Ca, P, K, Mg, Na, the proportion of organic component and the ratio C/N were determined. This analysis showed that short-term oscillations of the composition of detritus correlate, regarding their span, with seasonal changes. The dependence of such seasonal changes of detritus on the extent of the river flow rate was not proved. Differences in the amount of organic component, K, Mg, and the ratio C/N between floating and deposited detritus were found. In terms of qualitative composition, both types of detritus varied in the amounts of plant and inorganic particles. In comparison with available results from springs in the area of Blanice, the detritus from rivers differed significantly from the detritus originating in springs in the presence of faecal pellets, amorphous matter and plant particles.
The growth of freshwater pearl mussels was dependent on the water temperature in the river, a dependence on the tested parameters of detritus was not proved, varying trends, however, were discovered (e.g. higher content of P, better growth). Water temperature showed to be dependent on the horizontal profile: water temperature rises with the direction of the water flow and the content of organic component in the detritus decreases with the direction of the water flow. Other trends in the horizontal profile were discovered as well but they were not proved statistically. Based on biological indicators, the locality of Ovesná (the lowest point down the river Teplá Vltava) was assessed to be the most suitable station.
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