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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Microclimatic conditions as determinant of Vaccinium myrtillus pollination
 Veljačiková, Hana ; Janovský, Zdeněk (advisor) ; Červenková, Zita (referee)
Climate change affects phenology and distribution of plants and animals and causes a mismatch in plant-pollinator interactions. These changes are clearly manifested in extreme environments such as mountains or the beginning of the growing season. Vaccinium myrtillus is an important temperate and boreal species, inhabiting and often dominating such environments where changes due to global warming are already appearing. Flowers start to appear in April and May at the very beginning of the growing season. Without pollination, flower will almost never form a fruit. When comparing fruit set, it is possible to observe whether the flower has been pollinated and thus the quality of pollination in given conditions. Using experiments on the mountain heath in the Brdy Protected Land Area, I found out how the quality of pollination differs in different microclimatic conditions. I compared fruit set of chosen flowers and seed set in their fruits. Flowers blooming at the end of the flowering season had the greatest success in fruit formation, when I recorded a greater number of pollinators in the experimental environment. V. myrtillus bloomed more intensively at the beginning of the flowering season. Even so, fewer fruits were produced from flowers at that time. Bumblebees abundance was correlated to fruit and...
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Pollination in forest ecosystems
 Veljačiková, Hana ; Janovský, Zdeněk (advisor) ; Hadrava, Jiří (referee)
Interactions between plants and their pollinators in temperate forest are different from open habitats. In forest, pollinators are less abundant and this results in frequent pollen limitation of forest understory herbs. Pollinators also need to be adapted for flying in complex stands and for living in unfavorable microclimatic conditions. Floral resources predominantly limit pollinator abundance because of their uneven distribution in space and time. In the present bachelor thesis, I summarize knowledge on pollinator conservation and phenology as well as food resources, microclimate, which together with sufficient nesting options seem to contribute the most to pollinator abundance. Type of forest management is also an important factor, which affects density and diversity of pollinators. Generally, thinning out of trees and removal of understory shrubs have positive effect on flower abundance and benefit pollinators. Factors that influence reproduction success of flowers and pollen transfer distances are further discussed.
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