|
|
Modern technologies in population biology of a highly mobile mammal
Tkáčová, Nikola ; Hulva, Pavel (advisor) ; Apfelová, Mária (referee)
This bachelor thesis is dedicated to investigate the methods applicable to research of population biology of highly mobile mammals on the example of Eurasian lynx. Eurasian lynx (Lynx lynx) is one of the most widespread felid species. This species is considered to be a suitable model organism due to its large range which includes various ecologic, climatic and demographic conditions. Eurasian lynx fundamentally participates in shaping the entire ecosystem as an apex predator. Its return to the areas of the past occurrence has an effect on species composition there. For the effective protection of this species, it is crucial to use appropriate monitoring methods to obtain information on the distribution area, abundance and population trends. Monitoring of this animal is quite difficult due to its low population density, mainly dusk and night activity and large home-range size. On account of this knowledge hi-tech methods (e.g. GPS telemetry, camera-traps, genetic monitoring) are used. Various methods of monitoring are utilized for various study goals. Telemetry is one of the most commonly used and probably the most effective method for obtaining detailed information about biology and ecology of the species. On the other side this method is invasive and it is possible to track only limited count of...
|
|
|
A conservation perspective on the mechanisms that influence plant-pollinator interactions
BIELLA, Paolo
Several aspects of plant-pollinator interactions are presented in the thesis. It contains a review on the open questions of plant-pollinator interactions from single species to complex networks. The following sections document novel results. Firstly, the conservation of complex pollination networks is addressed through the hierarchy of species' importance. In addition, the habitat requirements and interactions of a threatened rare pollinator species are explored. In the following chapters, the results from manipulative approaches applied in the field to plant-pollinator interactions are presented. The effect of pollinator's population decline on pollinators' foraging for pollen is investigated. Moreover, the way plant species loss impact several aspects of pollinator visitation is presented. Lastly, the impact of species removal on plant-pollinator network topology and on species ability of establishing new interactions is investigated.
|
|
|
Habitat requirements and predictive distribution modelling of Huperzia selago
Trachtová, Pavla ; Wild, Jan (advisor) ; Douda, Jan (referee)
Studies of the occurrence of montane and boreomontane species in ravines of the sandstone landscape are scarce and the occurrence of these species are explained by the presence of temperature inversion. The question is, which factors limit the occurrence ofthese species in ravines with temperature inversion. The aim of this diploma thesis is to reveal factors that influence the occurrence of Huperzia selago in inverse ravines of sandstone landscape. This work uses a habitat variables recorded directly for populations of H. selago and variables derived from a digital elevation model. These derived variables are also used for creation of two predictive models of geographic distribution of H. selago in the National Park Bohemian Switzerland. When we summarize the most informative variables of predictive models and habitat conditions significantly different from control sites, we get the typical habitat of H. selago. Such sites will likely be found on the rock at the bottom of the valley. Factors that influence the suitability of habitat are: moisture, vegetation type, slope, and distance to the bottom of the valley.
|
guest ::
