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

ÁBRAHÁM L.: PIT BUILDING ANT-LION LARVAE 171 (Nagyharsány: Szársomlyó (NP) were examined. The pits oîMyrmeleonformicarius larvae were studied on clay bedrock (Kaposvár: Gyertyános (KP); Ropoly (RP)). The samples taken 10 cm from the edge of the pit (reference point) show the percentage of the general particle size distribution (Figure 2). The particles of loess or clay are finer than the particles of sand (>0.2 mm) but both kinds of substrate tend to granulate (become cemented) therefore their particle size is a characteristic of a certain sampling site. From figure 2, it is clear that clay proved to have bigger particle size even ifit is a finer substrate than sand (Figure 2: ZP, KP, and RP). In loess and clay samples, finer particles were found in bigger portion than in sand. In the sand samples of recent running water (Drava) at Tótújfalu, the proportion of the rounded so-called coarse sand of bigger particle size (>0.8 mm) (Figure 2: TP, TO) can be as much as 50%. In Inner Somogy, on the other hand, the surface is covered with angular fine sand (Figure 2: BO, BP, NO) which originates from the ancient Danube and the wind redeposited it in dunes over and over. Fine particle sand covers the sandy stretches of Látrány (Figure 2: LO) where the proportion of 0.5-0.8 mm particles is maximum 30%. The above statements are clearly demonstrated in the dendogram of figure 3, which also reflects on the fact that the shortest distance (Euclidean distance) is between samples coming from the protected (BP - Bélavár protected; TP Tótújfalu protected) and the open (BO-Bélavár open; TO-Tótújfalu open) habitats of the same sampling sites. The result shown by the dendrogram was given more details after a statistical analysis. According to the Spearmann rank correlation evaluation (Table 1), the difference between the sand samples from the same sampling site but from different types of habitat (TO-TP and BO-BP) and the difference between the samples collected from clay sampling sites (ZP, KP, RP) is not significant. Complete Linkage Euclidean distances Figure 3: The distance of substrate samples in different habitats The first letter refers to the sampling site the second letter to the type of the habitat (P-protected, O-open)