S. Mahunka szerk.: Folia Entomologica Hungarica 51. (Budapest, 1990)
The values of the !beetles of the ' stet.j-o he between the beetles of tl . nsen inde •: indicate high similarity between the ..at' and 'open habitat', and low similarities 'forest hat Liât ' and the two other phases (Table 2). Table 1, The slopes tegression lines fitted to the double logarithmi< .rves of the species-abundance distributions, [pr : significance of explained variance, slope: slop- 1 the fitted Lines, se: standard error of the slot ° : significance of regression lines] p(F) slope se P Sessile-turkey oak forest 0 0000 -1.388 0 1067 0 0000 Dolomitic steppe meadow 0 0000 -1.286 0 1269 0 0000 Open dolomitic grassland 0 0000 -1.245 0 199 9 0 0000 Between the 'forest habitat' and the 'steppe habitat' the mean diversity values for the fourteen samples are similar (two tailed t-test, DF=26 ; t=1.39, n. s.), but the value of the 'open habitat' is much smaller than both the values of the 'forest habitat' and 'steppe habitat' (t=3.08, p 0.01; t=4.13, p 0.001, respectively )(Table 3). Equitability shows an opposite similarity due to the small diversity values. There is a significant difference in only one case, namely, between the species of the 'steppe habitat' and 'open habitat' (t= 2.53, p 0.05)(Table 3) . Table 2. Values of similarity between the three stages of the successional sere, based on the Sorensen index Sessile-turkey oak forest Dolomitic steppe meadow 0 37589 Sessile-turkey oak forest Open dolomitic grassland 0 34450 Dolomitic steppe meadow Open dolomitic grassland 0 47568 The mean number of species are similar between the 'forest habitat' and the 'steppe habitat' (t=1.35, n. s.), just like, the abundance (t=1.80, n. s.). The beetle community living in the 'open habitat' highly differs from that of the 'forest habitat' in the case of species richness (t=4.99, p 0.001) and abundance (t=3.84, p 0.001)(Table 3). The relationships are similar between the beetles of 'open habitat' and 'steppe habitat' too (species richness: t=4.61, p 0.001; abundance: t=2.70, p 0.05). Table 3. Structure parameters of beetle communities associated with the three vegetation stages. (N=14, standard deviation in brackets) Open dolomitic grassland Dolomitic steppe meadow Sessile-turkey oak forest Species richness 8.71 (7.36) 26.6 (12.5) 34.5 (17.9) Abundance 1.543 ( 1.23 ) 5.007 (4.64) 9.192 (7.35) Diversity 0.98 (0.85) 2.00 (0.36) 1.78 (0.47) Equitability 0.41 (0.33) 0.65 (0.13) 0.54 (0.18)
