The focus of this thesis was on the dynamics of diurnal activity of the Alpine longicorn (Rosalia alpina) and its predator, the click beetle Stenagostus rhombeus, how is diurnal activity related to environmental conditions (temperature and light intensity), what is the active range of pheromone tarps and what is the dynamic of pheromone release by males. Field work was carried out in July 2019 in the Boč area, Slovenia. The laboratory work was conducted at the National Institute of Biology. The methods used for collecting the Alpine longicorn were pheromone baited traps and visual survey of beech logs. For collecting S. rhombeus, we used pheromone baited traps. Volatiles were collected from males using solid phase microextraction method. Collected samples were analyzed with gas chromatography mass spectroscopy method. We found out that the Alpine longicorn is a diurnal species, while click beetle S. rhombeus is both diurnal and nocturnal species, so the dynamics of these two species just partially match. We showed that the Alpine longicorn is more active at higher temperatures and higher light intensity, while S. rhombeus is more active at lower temperatures and lower light intensity. The active range of pheromone baited traps was estimated as at least 50 meters. We showed that the pheromone we used is aggregation pheromone as it attracts both males and females of the Alpine longicorn. On the assumption that the sex ratio in nature is 1:1, we can conclude that the pheromone attracts both sexes in the same ratio.
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