MADÁČOVÁ Zuzana: Response of hazel dormouse to natural disturbances [Bachelor-thesis] – Technical University in Zvolen, Faculty of Forestry, Department of Applied Zoology and Wildlife Management. Supervisor of bachelorthesis: doc. Ing. Peter Lešo, PhD. Zvolen, 2020. p 50.In this work, we focus on the ecology and biology of the hazel dormouse (Muscardinus avellanarius), (Linaeus, 1758). Monitoring takes place in three selected research areas in the Tatra National Park in the High Tatras. The areas are forest ecosystems affected by a wind disaster in November 2004 and subsequently by a fire in July 2005. The research is carried out in cooperation with the Research Station and the TANAP Museum, as a workplace for research and documentation of the natural environment of the Tatra National Park.To catch the hazel dormouse, we used nesting tubes, which we installed on different types of trees at different heights. We monitored its population dynamics. In the first year of our cooperation, we managed to install 108 nesting tubes on three surfaces and we per-formed a total of 17 inspections. We observed 13 individuals, which we did not mark in any way. We chipped two hazel dormouses. We recorded 26 nests.Most individuals (9) and nests (13) were recorded in the first research area, where the vegetation was restored naturally after the wind disaster and after the fire, and after 14 years it represented a varied woody and herbal composition, similar to the vegetation before the disasters. The second area was artificially restored after the windstorm, but the new vegetation was not so diverse. We recorded 4 individuals and 10 nests on it. In the third area, which was neither artificially nor naturally restored after the wind calamity, we recorded only 3 nests, without finding an individual stump.Preliminary results show that most nests were built by males, most often on Picea abies and Larix decidua. Females also preferred more Larix deciuda, but they also occupied tubes on deciduous trees. The leaves of Calamagrostis villosa were mainly used for the construction of nests. The density per 1 ha for two individuals observed during one control is 3.6 ind./ha. According to the evaluation, the hazel dormouse (Muscardinus avellanarius) chose the most common nesting tubes with an entrance oriented to the southeast.