National Repository of Grey Literature 6 records found  Search took 0.00 seconds. 
Microclimate as a driver of species distribution and community composition of bryophytes compared with lichens
Růžičková, Anna ; Man, Matěj (advisor) ; Starosta, Jakub (referee)
This bachelor thesis deals with the influence of microclimate on species distribution and composition of bryophyte and lichen communities. It defines the term microclimate, characterizes the specific properties of bryophytes responsible for their sensitivity to microclimatic conditions and includes a comparison of the role of individual microclimatic factors in controlling the distribution of bryophytes and lichens. The key microclimatic factors for bryophytes are humidity and air temperature, but the significance of each varies between functional groups of species and depending on the type of biome. With the available portable measuring devices with large battery capacity and memory storage, it is now possible to measure in-situ microclimate for the long-term and also with high spatial and temporal resolution. Despite that, there are currently only 12 bryological studies that provide continuously measured field microclimatic data on small spatial scales. The main part of the thesis summarizes these studies and compares the methodologies used. The paper can serve as a starting material for designing bryological microclimatic studies.
Genetic variability in the Physconia muscigena group (Physciaceae, Ascomycota) in the Northern Hemisphere
Starosta, Jakub ; Koukol, Ondřej (advisor) ; Steinová, Jana (referee)
The principal goal of our study was to test whether ecologically and chemically different populations of lichens in the Physconia muscigena (Ach.) Poelt group belong to multiple species or one. We used sequence data from three markers (ITS rDNA, mtSSU rDNA and TEF1-α) for the reconstruction of phylogenetic trees based on a sampling of mostly European and Canadian populations of P. muscigena (Ach.) Poelt, P. muscigena var. bayeri (Nádv.) Poelt, and P. isidiomuscigena Essl. Further, we sought any possible geographical or ecological trends among chemotypes and haplotypes. Results show that: 1) Sequence data of ITS rDNA and TEF1-α shows large genetic variation in the Physconia muscigena group. This genetic variability does not correlate with geographical distribution or thallus chemistry; 2) Physconia muscigena var. bayeri and P. isidiomuscigena appear undifferentiated in our phylogenetic trees with P. muscigena. These three species cannot be distinguished on the basis of ITS rDNA, mtSSU rDNA and TEF1-α sequences. 3) We synonymized Physconia muscigena var. bayeri with P. muscigena and we recombine P. isidiomuscigena as a variety of P. muscigena.
Microclimate as a driver of species distribution and community composition of bryophytes compared with lichens
Růžičková, Anna ; Man, Matěj (advisor) ; Starosta, Jakub (referee)
This bachelor thesis deals with the influence of microclimate on species distribution and composition of bryophyte and lichen communities. It defines the term microclimate, characterizes the specific properties of bryophytes responsible for their sensitivity to microclimatic conditions and includes a comparison of the role of individual microclimatic factors in controlling the distribution of bryophytes and lichens. The key microclimatic factors for bryophytes are humidity and air temperature, but the significance of each varies between functional groups of species and depending on the type of biome. With the available portable measuring devices with large battery capacity and memory storage, it is now possible to measure in-situ microclimate for the long-term and also with high spatial and temporal resolution. Despite that, there are currently only 12 bryological studies that provide continuously measured field microclimatic data on small spatial scales. The main part of the thesis summarizes these studies and compares the methodologies used. The paper can serve as a starting material for designing bryological microclimatic studies.
A taxonomic study of Physconia muscigena group
Starosta, Jakub ; Svoboda, David (advisor) ; Šoun, Jaroslav (referee)
The principal goal of my study was to find if ecologically and chemically different populations of lichens in the Physconia muscigena (Ach.) Poelt group belong to several species or a single one. This study focused on the molecular and chemical investigations of mostly European and Canadian populations. I use sequence data from three genes (ITS rDNA, mtSSU rDNA and TEF1) for the reconstruction of phylogenetic trees. I investigate phylogenetic relationships among the closely related species P. muscigena, P. bayeri, P. rossica, and P. isidiomuscigena. Also, I wanted to detect any possible geographical or ecological trends among chemotypes and haplotypes. As an additional goal I checked the recent localities of P. muscigena in the Czech Republic for valorising its conservation status. Results show that: (1) sequenced data of ITS rDNA and TEF1 show high intraspecific variability in P. muscigena samples. This genetic variability does not correlate neither with geographical distribution nor thallus chemistry; (2) P. bayeri is synonymous with P. muscigena; (3) some samples P. muscigena contain new undetermined secondary metabolite, (4) Physconia muscigena has only three recent localities in Czech Republic. Key words: Physconia muscigena, Physconia bayeri, infraspecific variability, taxonomy, TEF1, ITS...

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