Dr. Fűköh Levente szerk.: Malakológiai Tájékoztató 16. (Eger, 1997.)

SÓLYMOS,P.-NAGY, A.: The recent mollusc fauna of the szársomlyó (S Hungary): spatial pattern and microclimate

Fig. 6. Schematic drawing of the structure of the biotope on the different sampling areas(l-9) which are shown in Fig. I. Legend: forest with (a) Carpinus betulus, TIlia argentea and (b) Ruscus aculeatus, scrub with (c) Quercus pubescens and Fraxinus ornus, (d) grassland, (e) rocks, (f) horizontal cave. See Table I for more. It can be well detected that plant cover correlates with mollusc pattern. The biotopes of the closed subtypes are very different except for the exposure (see the distance on Fig. 7). The N scrub has superabundant bottom-level, contrary to this, the closed forest does not. The soil of the forest contains a minimal ammount of CaC0

3 (0.53%) in the upper level. This results in a poor mollusc fauna in Area 4. In other areas the soil contains more carbonate (1220%) (Lehmann, A. 1975). The biotopes of the open subtypes differ primarily in rock types, secondarily in the vegetation. The vegetation of the W part is very scattered with not too much humidity (see RSL in Chapter 3.1). On the contrary, the E part has opulent grasslevel with as much humidity as Fig. 7. Ordination of the sampling areas with Principal Coordinates Analysis (PCoA) using binary distances (Jaccard). Information content in 2D: 68.88%. The base matrix contains all the data of Table 2.