Ábrahám Levente: Válogatott tanulmányok II. - Natura Somogyiensis 9. (Kaposvár, 2006)

Ábrahám Levente: Pit building ant-lion larvae effect to the distribution of the substrate particles in their microhabitats - Tölcsérépítő hangyaleső lárvák hatása a szubsztrát szemcsék eloszlására élőhelyeiken

170 NATURA SOMOGYIENSIS where ri = percentage frequency of the given fraction of substrate type in reference point (rp) ni = percentage frequency of the given fraction of substrate type in pit side (ps) The index varies from -1.0 to +1.0, with values between 0 and +1 indicating preference and values between 0 and -1 indicating avoidance. The comparison of the different specific weight of the substrate at the reference points was carried out with the Spearman rank correlation. The substrates of same quality but of different types of habitats (TO-TP and BO-BP) were compared by paired samples ttest. The normality examination was carried out by Kolmogorov-Smirnov test. STATISTIC A 5.0 and S SP S 11.5 for Windows were used for the statistical analysis. Results In order to examine the size of the substrate particle preference of the ant-lion larvae samples in two different types of habitats were taken. In open habitats, the samples were collected at four sampling sites on sandy bedrock. In protected habitat two of the samples were from sandy bedrock, three from clay bedrock and one from loess bedrock. In open habitats on sandy bedrock the larvae of Myrmeleon bore (Bélavár: Kerek hill (BO); Tótújfalu: Csárda (TO)) were examined. The larvae from protected habitats occur in hilly and mountainous areas as well, where loose and dry scarps, drop-offs, artificial building sides and cliff ledges offer shelter suitable for their development. In these kinds of habitats the larvae of Euroleon nostras on sandy bedrock (Tótújfalu: Csárda (TP); Bélavár: Kerek hill (BP)), on clay bedrock (Zselickisfalud (ZP) and on loess bedrock Figure 2: The percentage of the particle size distribution by sampling site (The first letter is the initial of the settlement, sand: T-Tótújfalu, B-Bélavár, L-Látrány, N-Nagybajom; loess: N- Nagyharsány, Z-Zselickisfalud; clay: K-Kaposvár, R-Ropolypuszta, the seco ;d litter refers to the type of the habitat P-protected O-open)