20.500.12556/DKUM-81887 Selektivnost evropskega bobra (Castor fiber) pri podiranju dreves v zimskem obdobju na Dravograjskem jezeru magistrsko delo Selective tree-felling by the European beaver (Castor fiber) during winter on Dravograd lake Evropski bober je zaradi spreminjanja habitatov eden ekološko najpomembnejših glodavcev na svetu. Leta 2007, po nekaterih virih pa že 2006, smo sledove njegove prisotnosti začeli opažati ob Dravograjskem jezeru na Koroškem. Najbolj očitne sledi so podrta in poškodovana drevesa ter grmi, kar je posledica prehranjevanja z lubjem, poganjki in listi. Ker se na tem območju o bobru ne ve veliko, sem se odločila raziskati njegovo prehransko izbiro v zimskem obdobju. Cilj je bil ugotoviti, ali bober drevesa podira naključno. To pomeni, da delež podrtih dreves ne odstopa značilno od vrstne sestave v bobrovem habitatu. Ugotavljala sem razpoložljivost drevesnih vrst v bobrovem habitatu na podlagi 1244 popisanih dreves. Izkazalo se je, da je bober selektiven pri izbiri lesnih vrst. Izbiral je le štiri vrste, od tega najraje vrbo, jelšo in dren. Izbira je korelirala z razpoložljivostjo. Preferenca glede premera debla je bila odvisna od drevesne vrste. Večina (96 %) dreves je imela premer do 10 cm. Pri jelšah in drenih je izbiral tanjša debla, pri vrbah pa ni delal razlike med debelinskimi razredi. Beaver (Castor fiber) has an ability to create habitats which makes this animal one of the most ecologically important rodents on Earth. In 2007, according to some sources already in 2006, its presence was noticed by Dravograd lake in Koroška. Beaver cuts down woody plants to feed on their bark, shoots and leaves. Beavers by Dravograd lake are poorly investigated therefore I decided to assess their tree preference during winter. The main task was to determine whether beaver is selective at tree-felling. If so, the proportion of cut trees would differ significantly from a tree species composition in beaver's habitat. I assessed the availability of tree's species on a sample of 1244 individual trees. The results showed that beavers choose more frequently than expected from random willows (Salix sp.), alder (Alnus sp.) and dogwood (Cornus sp.). Prefered were stems less than 10 cm in diameter (96 %), but this depended also on tree species. Thinner stems were selected at alder and dogwood but no preference was noticed for willows. Castor fiber Dravograjsko jezero prehranjevanje izbira dreves Salix sp. Castor fiber Dravograd lake feeding tree selection Salix sp. true true false [T. Flis] Slovenski jezik Angleški jezik Dravograd (Slovenija ; občina); Magistrsko delo/naloga 2022-06-14 12:41:45 2022-07-27 13:27:09 2022-08-10 00:57:52 0000-00-00 00:00:00 2022 0 Maribor 0 Maribor X, 46 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 636.932.2(497.4)(043.2) 116542979 MAG_Flis_Tina_2022.pdf MAG_Flis_Tina_2022.pdf 1 4C590FEF3C6BEFB9FA694B71303D7AFB 86aab6f7587edaca3eb6a6e7000ddbd07babaadb5fdbf31082d9fbf6d0148f53 6322d244-f2db-11ec-aabb-00155d000105 20.500.12556/dkum/7d53eb01-d04b-4e72-b2dd-289251a827f6 https://dk.um.si/Dokument.php?lang=slv&id=158855 Fakulteta za naravoslovje in matematiko 0 0 0