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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Vegetation changes in Czech lowland forests over the past decades
 Kopecký, Martin ; Hédl, Radim (advisor) ; Chytrý, Milan (referee) ; Diekmann, Martin (referee)
Vegetation changes in Czech lowland forests over the past decades Martin Kopecký ABSTRACT To explore decadal changes in plant species diversity and composition of typical lowland forests in the Czech Republic, I compared vegetation on plots sampled decades ago with vegetation on the same plots sampled recently. First I evaluated the robustness of the approach used in my thesis. In Chapter 1, we provided the first direct test of the effect of uncertainty in original plot location on results from vegetation resurvey. We found that temporal trends in vegetation diversity and composition were comparable between exactly relocated permanent and only approximately relocated semi-permanent plots. Therefore, we conclude that the resurvey of semi-permanent plots is robust to the uncertainty in original plot location. Then, we showed that vegetation in lowland oak forest shifted from species-rich communities of thermophilous forest toward species poorer communities of mesic forest (Chapter 2). The species typical for thermophilous oak forests and nationally endangered species suffered the most significant decline. We identified as the main driver behind these changes shift from traditional coppicing toward high forest management after WWII. Further, we explored the processes behind temporal shifts in species diversity...
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Habitat association of moths (Lepidoptera: Macrolepidoptera) in a structurarly diverse nature reserve (Koda National Nature Reserve, Cesky Kras)
 ZÁVITKOVSKÁ, Lenka
Based on light trapping carried out in 2010, I studied moth communities of the Koda National nature reserve, part of Český kras landscape protected area, in order to compare moth communities inhabiting major biotope types within the reserve. The obtained material consisted of 295 species in 4455 individuals. Steppe enclaves hosted more species than overgrown coppices and beech-dominated high forests. Ordination analyses distinguished between steppe and forest biotopes. Steppe catches differed from forest catches in habitat associations of constituent species (more species of grassland habitats), whereas the two forest types did not differ in this. Identical patterns applied for all moths analysed together and for analyses restricted to Geometridae and Noctuidae moths. Steppic enclaves represent the most valuable sites within the Koda reserve.
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