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Impact of river system structure on the genetic diversity of reed populations
Fuxová, Gabriela ; Fér, Tomáš (advisor) ; Kubátová, Barbora (referee)
Many plant species are closely related to river biotopes or to biotopes influenced by rivers. River systems create important linear corridors in ecosystems and directly or non-directly influence spatial spread of species in these environments. This offer many questions about species spread in this system. We can answer these questions by using molecular methods. Using 10 microsatellite (SSRs) primers, 202 individuals of Phragmites australis from 60 populations were analysed. Those analyses allowed reveal kinship of individuals, obtain information about spatial spread of populations and about spreading of common reed. Phragmites australis creates both - monoclonal and polyclonal - populations. Dependence of rate of clonality on environment was revealed. Populations from river banks are more monoclonal, populations from pond shores are more polyclonal. Populations are isolated. The highest percentage of variability was explained on among-population level. This is common for anemochoric species. Communication between populations is present, more on shorter distances. Evidence for vegetative spread was found on short distance. Generative spread is much more common. Long-distance spreading is mediated by generative diaspores - seeds. This spreading includes within-river spread, among-river spread and spreading...
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Long-distance plant dispersal in rivers
Krajníková, Anežka ; Fér, Tomáš (advisor) ; Hroudová, Zdenka (referee)
The aim of this bachelor thesis is to summarise present methods used in the research of dispersal river plants. Generally the dispersal of all kinds of plants which can be dispersed in water corridors, both dispersed in the water column and at the bottom of the channel. The bachelor thesis is a literatural rewiev. The main part of it is focused on direct methods of research of hydrochory and problems which could arise with individual methods. Each method is suitable for different set of circumstances and it is necessary to know in advance what kind of data we want to obtain. The direct methods includes: catching of the seeds directly from the stream - at one time, but repeatedly, or long term catching by using floating traps. Secondly we can use seed mimics or marked diasporas. The second part is focused on other factors which can influence long-distance plant dispersal in rivers. They include the degree to which are rivers regulated and the fluctuation off water level during years. The paper also includes a part which summarise the evidence on long distance dispersal of river plants. Powered by TCPDF (www.tcpdf.org)
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Dispersal of clonal aquatic plants
Rydlo, Jan ; Fér, Tomáš (advisor) ; Hroudová, Zdenka (referee)
The aim of this Bc. thesis is to summarize the knowledge on clonal dispersal of aquatic plants and to compare the possibilities and measure of clonal dispersal in selected most-studied species. In the first part of the study, ways of clonal propagation of water plants by various types of vegetative diaspores and various means of transport (by water, animals) are described. Ways and possibilities of dispersal of aquatic clonal plants in various water systems (river systems, stagnant waters) and to various distances are described as well. Finally, anthropogenic effects on clonal dispersal of water plants, which can also play an important role, are discussed. These effects could stay behind many invasive events on the Earth represented by rapid clonal reproduction and dispersal of some species of aquatic macrophytes in their non-native area. The next part of this thesis deals with methods to study the dispersal of aquatic clonal plants and assesses their relevance for various spatial scales. These methods and results of case studies are presented for the most often studied species of water macrophytes. Results of these studies are summarised to demonstrate the real efficiency and distances of clonal dispersal of aquatic plants. Powered by TCPDF (www.tcpdf.org)
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Impact of river system structure on the genetic diversity of reed populations
Fuxová, Gabriela ; Fér, Tomáš (advisor) ; Kubátová, Barbora (referee)
Many plant species are closely related to river biotopes or to biotopes influenced by rivers. River systems create important linear corridors in ecosystems and directly or non-directly influence spatial spread of species in these environments. This offer many questions about species spread in this system. We can answer these questions by using molecular methods. Using 10 microsatellite (SSRs) primers, 202 individuals of Phragmites australis from 60 populations were analysed. Those analyses allowed reveal kinship of individuals, obtain information about spatial spread of populations and about spreading of common reed. Phragmites australis creates both - monoclonal and polyclonal - populations. Dependence of rate of clonality on environment was revealed. Populations from river banks are more monoclonal, populations from pond shores are more polyclonal. Populations are isolated. The highest percentage of variability was explained on among-population level. This is common for anemochoric species. Communication between populations is present, more on shorter distances. Evidence for vegetative spread was found on short distance. Generative spread is much more common. Long-distance spreading is mediated by generative diaspores - seeds. This spreading includes within-river spread, among-river spread and spreading...
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