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DVOŘAK JAN: Diet preference of Eurasian Beaver (Castor Fiber L., 1758) in the environment of Oderske vrchy and its infl uence on the tree species composition of river bank stands. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2013, LXI, No. 6, pp. 1637–1643 This paper deals with the dietary behaviour and the tree species preference in the river bank stands in the diet of established population Eurasian Beaver (Castor fi ber L., 1758) in the environment of Oderske vrchy; the objective is to assess the suitability of this environment for future development of the Eurasian Beaver and to asses the infl uence of the beaver’s dietary behaviour on the river bank stands. In the monitored area, the total of 5 tree species with the following preference were recorded: willow (Salix) 42.2%, aspen (Populus) 28%, dogwood (Comus) 15.5%, birch (Betula) 7.4% and alder (Alnus) 6.9%. The most damaged diameter interval recorded within the all damaged tree species ranges from 2.6 to 6 cm, followed by the interval 6.1–12 cm. Over 61% of the trees felled by the beaver had a bigger diameter. The most sensitive reaction to beaver’s dietary behaviour was shown by aspen (reduction of numbers by 27.6%) and by willow (reduction of numbers by 16.6%) on the monitored area. Eurasian Beaver Castor fi ber, dietary behaviour, tree species preference In the Czech Republic, the Eurasian Beaver (Castor fi ber L., 1758) is an endemic species that was extinct due to commercial exploitation and signifi cant damage infl icted to the forest stands in the 18th and 19th century (Andreska and Andreskova, 1993). In the 20th century, due to reintroduction programmes in certain Central European countries and due to natural migration, beavers began to appear permanently in the Czech Republic; in 1967, in the Elbe River, since 1979 in the Moravia River, since 1988 beavers are permanent in the Kyjovka River in Hodonin region and in the Dyje River near Lednice na Moravě (Zajicek, 1992), since 1993 in the South and West Bohemia and since 1996 in the Jihlava River near Pohořelice (Vorel, 2005; Anděra and Horacek, 1982). In the Litovelske Pomoravi Protected Area, beavers are present since the reintroduction in 1991 (Kostkan, 2000). The original strong increase of numbers of sites with beaver’s presence shows a steadying tendency and instead of the beavers spreading around their presence changes from temporary to permanent (Anděra and Cervený, 2004). Eurasian Beaver is a strongly territorial species (Wilsson, 1971; Broschart, 1989), closely fi xated to water, mainly to sites with slow currents or still waters with stagnant water level as much as possible and with the depth minimum of 1–1.5 m (Vorel, 2005). Beavers can live in a wide range of habitats, starting from big rives to small currents in the foothills; their presence is also signifi cant and interesting in agricultural and ameliorated areas (Heidecke, 1989). The territory size or the length of the inhabited river banks depends on the water system (Novak, 1987) and the habitat (Kostkan, 2000). The presence of continuous alluvial so wood

acta universitatis agriculturae et silviculturae mendelianae brunensis

Diet preference of Eurasian Beaver (Castor Fiber L., 1758) in the environment of Oderské vrchy and its influence on the tree species composition of river bank stands