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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Evolutionary forces of Central European taxa of the genus Dactylorhiza
 Bílá, Klára ; Urfus, Tomáš (advisor) ; Figura, Tomáš (referee)
Genus Dactylorhiza, comprising green terrestrial orchids, belongs to of the most taxonomically complex groups of Europeran flora. Basic species often hybridise between each other and there is a lot of taxonomically challenging hybrids and hybridogenous lineages. Essential parental species of majority of hybrids and hybridogenous lineages are D. incarnata, D. maculata and D. fuchsii. Sister genus of Dactylorhiza is Gymnadenia which shares some similar features with Dactylorhiza species. Dactylorhiza viridis, formerly classified into the genus Coeloglossum, is the earliest diverged species. Diversity centre probably takes place in the Mediterranean Basin from where Dactylorhiza species migrated back to the Central Europe in postglacial. Major force of the genus evolution is polyploidisation which together with hybridisation leads to establishment of allopolyploid lineages. Unique feature of many orchids (including genus Dactylorhiza) is partial endoreduplication, which somatic endopolyploidisation of certain part of genome takes place. Pollination type is also important for Dactylorhiza microevolution. Deceptive flowers of Dactylorhiza genus are mainly pollinated by naive bumlebees but even beetles or ants can be pollinators. Majority of Dactylorhiza species are threatened by habitat loss during last decades....
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Drug prevention at secondary school
 Bílá, Klára ; Váňová, Miroslava (advisor) ; Mazáčová, Nataša (referee)
The bachelor thesis deals with drugs, their types and drug prevention. It includes the research conducted at several high schools. The aim of the research was to map drug abuse and sound out pupils' opinion on prevention programmes, which are carried out in schools. The work also embraces the interview with methodologist of socially pathological behaviour, which enabled insight into the problem from the expert's point of view.
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See also: similar author names
7 BÍLÁ, Kateřina
1 Bílá, Karolína
7 Bílá, Kateřina
2 Bílá, Kristina
1 Bílá, Kristina Beatrix
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