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

Sólymos Péter: Comparative malacological survey of the Szársomlyó and the Fekete Hill (Villány Hills, S Hungary). - Összehasonlító malakológiai vizsgálatok a Szársomlyón és a Fekete-hegyen (Villányi-hegység)

114 DUNÁNTÚLI DOLGOZATOK (A) TERMÉSZETTUDOMÁNYI SOROZAT 10. (2000) -0.17 -0.11 -0.04 0.02 0.08 0.15 1st axis Fig. 2. Ordination of the studied mollusc assemblages by nonmetric multidimensional scaling (NMDS). The Bray-Curtis dissimilarity index was applied. Normal faced numbers (1-18) represent the numbers of the sampling sites according to Table 2, The spaces of the four soil samples belonging to the same sampling site are outlined with thin line polygons. Thick line polygons and boldfaced numbers represent the main cluster hierarchy of Fig. 4. The values of the Shannon diversity confirm the separation of the diverse and moderately diverse sub-groups too (Table 3). The mean number of individuals and mean number of species of the four sub-groups are significantly different. Group 1.1. (closedmoderate) has one magnitude more abundant mollusc assemblages (466 individuals and 17 species in average) than group 1.2. (closed-extreme, 51 individuals and 6 species in average). The mean numbers of individuals are higher in the open cluster group than in the closed one. The assemblages in group 2.2. (open-moderate) are more abundant (1987 individuals and 12 species in average) than that of in group 2.1. (open-extreme, 1417 individuals and 10 species). Concerning mean abundances the two main cluster group show similar tendencies on their lower hierarchy levels: assemblages of the extreme groups are less abundant. Areas with closed vegetation (group 1.1. and 1.2.) have three general character species: Euomphalia strigella (Draparnaud, 1801), Aegopinella minor (Stabile, 1864) and Helix pomatia Linnaeus, 1758. While Acanthinula aculeata (O. F. Müller, 1774), Punctum pygmaeum (Draparnaud, 1801) and Truncatellina claustralis (Gredler, 1856) are the character species of the closed-moderate cluster group (1.1.). The closed-extreme group (1.2.) has got no proper character species but the general species of the higher cluster level are abundant here as well (Fig. 4 and Table 2).