Uherkovich Ákos: A Villányi-hegység botanikai és zoológiai alapfelmérése (Dunántúli Dolgozatok Természettudományi Sorozat 10., 2000)

Horváth Győző: A gyöngybagoly (Tyto alba) köpeteiből kimutatott kisemlős-összetétel tájökológiai szempontú értékelése a Villányi-hegység mentén. - Landscape ecological assessment of the small mammal fauna of the Villány Hills, South Hungary, as inferred from barn owl (Tyto alba) pellets

416 DUNÁNTÚLI DOLGOZATOK (A) TERMÉSZETTUDOMÁNYI SOROZAT 10. (2000) 2. táblázat: Az 5 település légifotók alapján elemzett foltjainak mérete és %-os aránya Tab. 2. Size and relative proportion of pathes in the 5 villages analysed based on arial photographs Mintahely • Csarnóta Kistótfalu Nagytótfalu Palkonya Túrony Sampling area Folttípus T[ha] % T[ha] % T[ha] % T[ha] % T[ha] % Patch type • szántó 145.22 55.96 123.72 47.24 111.76 42.44 81.6 30.65 106.41 40.48 erdőfolt 53.51 20.62 12.84 4.9 1.66 0.63 66.85 25.11 72.52 27.59 legelő 12.14 4.68 0 0 0 0 0 0 0 0 mocsaras gyep 10.25 3.95 40.38 15.42 0 0 8.1 3.04 0 0 belterület 5.86 2.26 13.43 5.13 13.76 5.22 8.91 3.34 7.89 3.00 kert 16.53 6.37 49.47 18.89 41.71 15.84 33.89 12.73 30.36 11.55 zárt kert 14.03 5.4 0 0 0 0 9.41 3.53 27.91 10.62 száraz gyep 0.88 0.34 12.29 4.69 8.34 3.16 35.06 13.17 15.93 6.06 út 1.07 0.41 2.47 0.94 3.64 1.38 2.51 0.94 1.79 0.68 tó 0 0 7.27 2.77 0 0 19.88 7.46 0 0 szőlő 0 0 0 0 82.45 31.31 0 0 0 0 Osszes/Total: 259.51 100 261.91 100 263.35 100 266.23 100 262.87 100 Landscape ecological assessment of the small mammal fauna of the Villány Hills, South Hungary, as inferred from barn owl (Tyto alba) pellets Győző HORVÁTH The habitat patch patterns of 5 areas measuring 1600x1600 m each, in the neighbourhood of 5 selected villages along the Villány Hills were analysed based on aerial photographs. During 1985-1999 a total of 56 pellet samples were collected in these 5 villages, yielding 1722 pellets and pellet debris that allowed the identification of all in all 4271 small mammal specimens. The samples contained 787 specimens belonging to the order Insectivora and 3484 specimens of the order Rodentia. From prey lists compiled on the basis of barn owl pellets, niche breadth and niche overlap between nesting site pairs were calculated for each sampling site. For the comparison of patch patterns we calculated percentage patch overlap, the highest and lowest values of which were 80.59% and 51.47%, respectively. The analysis of niche overlap as a function of patch overlap revealed positive linear corelation between these variables. Due to the low number of sampling sites these correlations were not significant, yet they indicate that the similarity of landscape patterns is related with the composition of small mammals acting as pos-sible prey items for the barn owl. The 5 sampling sites were compared using cluster analysis based on both prey list and patch pattern. In both cases the two generated den-drograms contained two groups but only two of the villages fell within the same cluster in both classifications. Niche breadth was evaluated in relation to patch diversity on the on hand and to relative patch richness on the other. Negative linear trend was revealed in both cases, which indicates that the majority of the patches is unsuitable for hunting by the barn owl. In other words the most patch-diverse areas do not necessarily yield greater niche breadth values. Authos's address: Dr. Győző HORVÁTH Zootaxonomical and Synecological Department, Faculty of Natural Sciences Uviversity of Pécs, H-7601 Pécs, Ifjúság útja 6.