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)

SÓLYMOS, P.: COMPARATIVE MALACOLOGlCAL SURVEYS IN THE VILLÁNY HILLS NuCoSA 1.05 -0.

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2? 1st axis Fig. 3. Ordination of the sampling sites (1-18) by Nonmetric Multidimensional Scaling (NMDS). The Bray-Curtis dissimilarity index was applied. Boldfaced numbers outlying the polygons represent the main cluster hierarchy of Fig. 4. The soil of the oak-hornbeam forest of the N slopes (site 5, 11 and 16) belonging to the closed-extreme (1.2.) group contains a minimal ammount of CaC0

3 in the upper layer (0.53% at site 5, LEHMANN 1975) and this may results in the poor mollusc fauna (Table 3). On other areas of the Szársomlyó the soil contains more carbonate (12-20%) in the upper layer (LEHMANN 1975). Vitrina pellucida (O. F. Müller, 1774) is symmetrical indicator of the shrub forest of the Szársomlyó on the N slope (site 1 and 2). Cochlodina laminata (Montagu, 1803) is asymmetrical indicator of the same area as the latter species. The presence of these relatively hygrophilous species can be explained by the relatively high air humidity caused by the northern exposure (HORVÁT & PAPP 1965). Chondrula tridens (O. F. Müller, 1774) is characteristic to the oak forest of the Fekete Hill on the S slope (site 15) but those shells are damaged and look very old (subfossil) so the pre-forest origination of them is likely from the time when the area of the hill was intensively grazed (DÉNES 1998). Limacidae species are character species of the Csillag Valley but this fact must be criticised on the basis öf the taphonomical problem and the low conservation probability of the rudimental shells. Ena obscura (O. F. Müller, 1774), Vitrea contracta (Westerlund, 1871) and Daudebardia ruf a (Draparnaud, 1805) are asymmetrical indicators of the oak forests of the Fkete Hill (Table 2), their presence cannot be predicted in all samples of one habitat but contributes to the habitat specificity (indicator