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National Repository of Grey Literature 2 records found  Search took 0.02 seconds. 
Floral biology of temperate and tropical alpine plants
 Nekola, Matyáš ; Sklenář, Petr (advisor) ; Janovský, Zdeněk (referee)
From all alpine ecosystems are tropic ones the most distinct, mainly due to aseasonality of their climate. In temperate alpine ecosystems seasonality causes annual changes in temperature and creation of snow cover. On the other hand, in tropical alpine ecosystems annual mean temperatures stay approximately same, but thanks to the high radiation heat loss at night temperatures vary significantly throughout the day diurnal. These environments also differ in change of day length throughout the year, altitude and atmospheric pressure. Plants created diverse adaptations in response to these different conditions. In temperate alpine ecosystems most of plants preform their floral primordia at least one year in advance. Flowering is initiated by photoperiod, temperature and combination of two previous factors, or immediately after the end of dormancy. Early flowering species are limited by the transfer of pollen and are allogamous. Late flowering species are autogamous. Main pollinators are from order Diptera. In tropical alpine ecosystems initiation of flowering correlates with decrease of minimal night temperatures and change in water availability. Asynchronously flowering species tend to be allogamous and autogamy prevails at synchronously flowering species. The most important pollinators are from genus...
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Anatomy and functional ecology of tropical alpine plants in South America
 Gorčicová, Barbora ; Sklenář, Petr (advisor) ; Stančík, Daniel (referee)
The bachelor thesis discusses the plants in the páramo. The first part describes unique environment located at high altitudes of the tropical South America, the páramo. The uniqueness of the environment is caused by several basic conditions. The most important ones are significant daily temperature fluctuations, tropical climate stability during the whole year and high altitude. Anatomy of adapted plants, discussed in the second part of this work, conform to the extreme conditions. There are specific páramo life forms thanks to the uniqueness of the environment. The leaf structure and the vascular system of the plants are significantly modified in terms of anatomy. Although there are quite specific (and therefore interesting) life forms in the páramo, the current knowledge of the plant anatomy is minimal. The last part of the thesis suggests the questions for my future master thesis, which will contribute to better understanding of this underexplored topic.
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