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 MALACOLOGICAL SURVEYS IN THE VILLÁNY HILLS Granaria frumentum (Draparnaud, 1801), Zebrina detrita (O. F. Müller, 1774), Helicella obvia (Menke, 1828), Truncatellina cylindrica (Férussac, 1807) and Oxychilus inopinatus (Ulicny, 1887) are the general species characteristic to the areas with open vegetation (group 2.1. and 2.2.). On the lower cluster level, the open-extreme group (2.1.) has got no special character species and this is similar to that of the closed-extreme group. Truncatellina callicratis (Scacchi, 1833) is the most remarkable character species of the open-moderate cluster group (2.2.) (Fig. 4 and Table 2). Laciniaria plicata (Draparnaud, 1801) is the character species of the tessellated shrub forest of the Szársomlyó (site 6 and 7), while soil-dwelling Cecilioides acicula (O. F. Müller, 1774) is characteristic to the rocky grassland above the Monument Park of Nagyharsány (site 8) which has deep and humic soil. Vallonia pulchella (O. F. Müller, 1774) is also abundant but not characteristic here in site 8. Pupilla triplicata (Studer, 1820) is the character species of the tessellated shrub forest located on the rocky ridge region of the Szársomlyó (site 9). Site 9 has some asymmetrical indicators as well: Euconulus fulvus (O. F. Müller, 1774) and Chondrina clienta (Westerlund, 1883). The exclusively rock-dwelling C. clienta is here and there abundant on the Szársomlyó (e.g. in site 4). Vallonia costata (O. F. Müller, 1774) is asymmetrical indicator of the grasslands of site 9 and 10. V. costata segregates of V. pulchella and looks more tolerant to drier conditions. Cochlicopa lubricella (Porro, 1838) is asymmetric indicator species of the W part of the Szársomlyó (site 8, 9 and 10) (Table 2). The transitional shrubs of the Szársomlyó (site 6, 7 and 9) belong to the openmoderate group (2.2.). These areas are mosaic-like so the variety of the microhabitats can present good conditions for several species (Table 3). Furthermore the Szársomlyó is built of Cretaceous limestone on the W part and Jurassic limestone on the E part. Their chemical features are quite the same but their physical features are very different and this causes differences in the soil types and the vegetation of the two parts of the hill (LEHMANN 1975). The different base rocks may indirectly cause the segregation of the moderate (site 6-10) and extreme (site 3 and 4) grasslands of the Szársomlyó (Fig. 4). Different vegetation structure causes different microclimatic conditions. The microclimatic fluctuation (considering air temperature and air humidity) is higher in the steppe grassland but the rocky grassland is drier than the steppe one and the microclimatic fluctuation in the shrub is minimal (SÓLYMOS & NAGY 1997). Closed and transitional vegetation can keep a lot of humidity and the temperature is permanently lower than in open areas because the active radiation zone is at upper hights (HORVÁT & PAPP 1965, SÓLYMOS & NAGY 1997). These effects are well detectable in the spatial pattern and the composition of the mollusc assemblages. Acknowledgements Above all, I would like to thank Z. Varga and P. Sümegi for their helpful comments and for giving valuable advices during my work, A. Dénes for the field trips, Á. Uherkovich for some bibliography, T. Magura and B. Tóthmérész for their help in the statistical procedures, A. Nagy and B. Tóth for their help in sampling, the Bachmanns for the hospitality, and the Duna-Dráva National Park for the permissions. The research was partly supported by the "Students for Science" section of the Pro Renovanda Cultura Hungáriáé Foundation.