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Historical occurrence of bark beetle (Coleoptera: Scolytinae) in the Bohemian Forest, Czech Republic, and possibility of its study in lake sediments
Vytisková, Markéta ; Hořická, Zuzana (advisor) ; Hruška, Jakub (referee)
The bachelor's project is closely related to the problem of bark beetle calamities in the Bohemian Forest National Park in the Czech Republic, and to a possible use of paleolimnological methods for their historical reconstruction. The importance of subfossil beetles as a proxy in assessing past changes in the nature is growing, and the occurrence of remains of Scolytinae in lake sediments has been confirmed - also in the Bohemian Forest paleolake Stará jímka. The thesis is a literature review of (1) the relationship between spruce forests and bark beetle gradations in the area, and (2) chitinous remains of bark beetle and other Scolytinae preserved in lake sediments, and their paleoecological implications. Key words Bohemian Forest (Czech Republic), spruce forests, bark beetle, paleolimnology, subfossil Coleoptera, paleolake Stará jímka
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Bark beetles in forest ecosystems with disparate disturbance regimes
Zemanová, Jana ; Horák, Jakub (advisor) ; Jiří, Jiří (referee)
This thesis evaluated the influence of the forest environment with various rate of disturbance. Studied sites were left to spontaneous succession. The method of trunk window traps was used. These traps were divided into pairs at monitored sites. Each pair comprised active (with yellow label attached) and passive trap. The influence on the bark beetles was evaluated by statistical analysis. In total, 346 individuals were captured and 12 species of bark beetles were identified. The influences of the environment (circumference of tree trunk, canopy openness, dead wood, altitude and type of trap) were significant for the number of individuals, the total body length, the width of shield and the length of elytron. Wing length was only affected by circumference of tree trunk, canopy openness and dead wood. Number of species was only influenced by altitude.
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