National Repository of Grey Literature 15 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Paleoecological study of the Cretaceous extremophilic flora with emphasis on xerophytes
Čepičková, Jana ; Kvaček, Jiří (advisor) ; Teodoridis, Vasilis (referee)
Thestudied materialcomesfromtheBohemianCretaceousBasin,Peruc-Korycany FormationCenomanianage,fromthelocalitiesPecínovandPraha-MaláChuchle. Recent plantswereusedforcomparisonwithfossilxeropyhteandmesophyteplants.Fossilandrecent materialwasmacromorphologicallydocumentedandanalyzedusingcuticularanalysis. Inthesystematic part, elevenfossiltaxafromdivisions Lyginopteridophyta, Cycadophyta,Ginkgophyta,Pinophytaand Magnoliophytaweredescribed.Fromthese,three newtaxawereestablished:bennetiteleafofZamitesmirovanaesp.nov.,angiospermleavesof Dicotylophyllumlabutae sp. nov.andD. pecinovense sp. nov. Based onthestudy of macro-and micro-morphology,it wasdistinguished whichpartofthestudied material belongstotheextremophytes.Observationsofmicromorphologyshowedthatplantsthatwere exposedto waterstress weretryingto overcome thisconstraint byadjustingtheir micromorphology. Analysingpreviouslypublishedandnewlyacquireddatahelpedtoseparatehalophytes fromotherstudiedfossiltaxa.Theseplantsfromtheenvironmentofsaltymarshesandtide- influencedswampsarecharacterisedbythickcuticle,stomataembeddedinstomatalchamber and/orsurroundedbyraisedrimsorpapillae.Theyshowvariousformsofwrinklesorpapillae ontheir externalsurface ofepidermisandarecomparativelyabundantin sediments ofthePeruc-KorycanyFormation.Theboundarybetween...
Sphenopterid type of true ferns from Carboniferous basins of Czech massive
Frojdová, Jana ; Pšenička, Josef (advisor) ; Kvaček, Jiří (referee) ; Rößler, Ronny (referee)
This thesis deals with the sphenopterid types of ferns from the Czech Carboniferous basins. Thesis is presented as a combination of two published papers in peer-reviewed journals, one manuscript in review and one manuscript ready for submission. The actual text of the thesis is a general introduction with introduction to the study subject of sphenopterid ferns, methodology, studied type collections, terminology and the result of my study. The introduction of the thesis provides a general overview of the ferns and history of their studies. All four papers presented here are focussed on modern redescription, redefinition, emendation and revision of genera Boweria Kidston, Dendraena Němejc, Sturia Němejc. Based on the revision of these genera, following two new genera were established: Kidstoniopteris gen.nov. and Paraszea gen.nov. A new species Boweria nowarudensis has been described during the course of this study. The "whole plant concept" was applied to all studied specimens, which allows to obtain as much information on the ferns morphology, anatomy, and reproductive organs as possible. This was combined with data on in situ spores as well as sedimentological and petrological analyses. The sporangial cells as annulus, stomium and apical cells and in situ spores were described for all genera and...
Early vascular plants in the Czech Republic
Uhlířová, Monika ; Kvaček, Jiří (advisor) ; Opluštil, Stanislav (referee)
Vascular plants are characterized as a group of plants, which are already fully adapted to live on the land. Their evolution is a result of a set of adaptations that have required the necessary changes at anatomical and morphological level. Some evidences about the rise of vascular plants appear in the fossil record from the Middle Ordovician in the form of spores and later also from the Early Silurian in the form of megafossils. The aim of the thesis is to briefly describe and discuss the most important published findings of fossils, especially megafossils, of the early vascular plants from the Silurian. Interest is especially focused on published material from the Czech Republic. The thesis also includes more detailed description of the genus Cooksonia, representing the first vascular plants, which are discovered in the megafossil record. Key words: vascular plants, spores, megafossils, Silurian
Overview of the fossil bryophytes of the Cretaceous and Tertiary of Bohemian Massif
Veselá, Veronika ; Kvaček, Zlatko (advisor) ; Kvaček, Jiří (referee)
The bachelor thesis summarizes the findings about previously described and published findings of bryophytes from the period of Cretaceous and Tertiary on the territory of the Bohemian Massif. It contains a chapter with current knowledge of taxonomy and life strategies of bryophytes, used to approach the studied groups. Part of the thesis is dedicate to the brief characteristics of the geological settings of locations with known findings of fossil bryophyte. Those locations are situated mainly in the České středohoří Mountains, the Bohemian Cretaceous Basin and the Českobudějovická Basin. For example and comparison are involved also two locations from Outer Western Carpathian. There are only two liverwort species (Notothylacites filiformis and Riccia cf. fluitans) and a few mosses (Hypnum heppii, Muscites sp.) described so far. Because of partial preservation of most of the findings any detailed systematical attribution remains ambiquous. The thesis has purely review character and is supposed to become a basis for further research and study. Key words: Bryophyta, Czech Cretaceous and Tertiary, review
Jurisdictional Immunity of States
Kvaček, Jiří ; Ondřej, Jan (advisor) ; Balaš, Vladimír (referee)
Title: Jurisdictional Immunity of States Abstract The major purpose of this diploma thesis is to clarify the situation of jurisdictional immunity and immunity from enforcement measures of states. This thesis is composed of two main parts. In the first part the institute of jurisdictional immunity of states is explained. The first part is divided into several chapters which are dedicated to the specific aspects of jurisdictional immunity. The first chapter deals with the theoretical terms which are closely related the topic such as sovereignty of state and jurisdiction. It was also necessary to explain the difference between the state acts iure imperii and iure gestionis. The following chapter is dedicated to the explanation of the historical evolution of this institute documented by the most significant decisions of national courts which have strongly influenced forming of the state immunities. The legal sources are described in the following chapter, a special attention is paid to the international treaties, national legal acts and also to the situation in the Czech Republic. The last chapter of the first part deals with the exceptions from jurisdictional immunity. The second part of the thesis is focused on the topic of state immunity from enforcement measures. This institute is a secondary immunity of...
Autecological study of selected Cretaceous plants using stable Carbon isotopes
Zahajská, Petra ; Kvaček, Jiří (advisor) ; Diefendorf, Aaron (referee)
1 Abstract This thesis presents an analysis of fossil plants from the Cenomanian Peruc-Korycany Formation of the Bohemian Cretaceous Basin and from the Bückeberg Formation of the Lower Saxony Basin in Germany. Based on earlier studies, both areas provide sediments that are considered to have developed in tidally influenced fluvial systems. Studied fossil plants are represented by ginkgoalean plant leaves (Ertemophyllum, Tritaenia), branches of conifers (Frenelopsis) and lauroid angiosperms (Eucalyptolaurus). Frenelopsis, Eretmophyllum and Tritaenia are considered to be halophytic plants, while Lauroid angiosperms were considered to grow in fresh water conditions. The fossil plants were studied using cuticle analysis and two methods of stable carbon isotope analysis: Bulk carbon isotope analysis and Compound Specific Isotope analysis. For cuticle analysis samples were observed and documented macroscopically and microscopically. To specify the environmental conditions, recent samples from three salt marshes in Great Britain were studied and analysed using the same methods as the fossil samples. The data from all observations and measurements were processed and their interpretation supported the modelled environment based on the sedimentological data. Frenelopsis were growing in a haline environment with low...
Plant - insect interactions in lower Miocene of Central Europe: palaeoclimatological and palaeoecological implications
Knor, Stanislav ; Prokop, Jakub (advisor) ; Kvaček, Jiří (referee) ; Mikuláš, Radek (referee)
The paleoecology of plant - arthropod herbivory associations constitute very important source of knowledge about the phylogeny and co-evolution of both groups. The traces of herbivory interactions between plants and arthropods on the fossil leaves are preserved as so called damaged types (DTs) clustered into distinct functional feeding groups (FFGs). The diversity and frequency of these damage traces also seem to have been strongly influenced by environmental and climatic conditions. This research has been focused on rich fossil plant assemblages from the area of the Most Basin in the north-western Bohemia. The undergoing work has comprised the diagnosis of the individual damages on the basis of their specific morphological traits as their number, size, shape and distributional pattern on the leaf surface. The next issue has involved the statistical analyses concerning the differences in the frequency and diversity of the types of damage and functional feeding groups between two separate fossiliferous layers, namely those of the stratigraphically older Bílina Delta and younger Břešťany Clay. Significant differences were confirmed in this regard, especially in connection with achieved frequency and proportional occurrences of distinct functional feeding groups in the Bílina Delta. The galls were the...
Mycorrhisa in fossil record
Kadlecová, Veronika ; Kvaček, Jiří (advisor) ; Gryndler, Milan (referee)
Mycorrhizal symbiosis is present in the vast majority of extant land plants. Mycorrhizae represent a significant source of nutrients for both partners of the symbiosis and can also provide them with protection or help them survive in less hospitable enviroment. Mycorrhizae is believed to have been just as important in the past and played a major role in evolution of plants, for example in the transition of plants onto land. Mycorrhizal symbiosis is an object of many research works today for its agricultural importance. There is an amount of publications on research of fossil mycorrhizae, but there is still little interest in this issue. Powered by TCPDF (

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3 Kvaček, Jan
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