Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 83. (Budapest 1991)

Báldi, A. ; Ádám, L.: Habitat selection of ground-dwelling beetles during dolomitic succession

248 A. Báldi & L. Adám Table 2. Values of mean habitat fidelity and habitat selection indices of the four beetle species groups, separated by cluster analysis. See text and Fig. 1 for explanation of symbols I, II, III and IV Oak Dolomitic Open Closed Habitat Forest steppe dolomitic dolomitic selection meadow grassland grassland index I(n=9) + 0.74 -0.59 -0.79 -0.89 3.02 II (n=6) -0.49 +0.75 -0.84 -0.94 3.02 III (n=l) -1.00 0.00 0.61 -0.99 2.63 IV (n=6) -0.92 -0.44 -0.94 0.79 3.09 According to the mean values of habitat fidelity and habitat selection indices, the forest and the dolomitic steppe meadow habitats seemed to be similar, but these indices showed higher values in the case of the closed dolomitic grassland (Table 2). It means that the closed dolomitic grassland is less similar to the other habitats. Where the habitats were bordering, the error of the habitat selection caused by random movement of individuals increased, like in the case of the forest and the dolomitic steppe meadow habitats. Only one species was found in the open dolomitic grassland {Pedinus femoralis), therefore we did not use this habitat for comparison. There was not any significant difference between the mean habitat selection index of generalists (scavengers, dung feeders and detritus feeders) and that of specialists (herbivores and predators) (two-tailed t-test; d.f. = 20, t = 1.39, n.s.). Fig. 2. Changes of habitat selection indices of the six most abundant beetle species, from April to October. The X refer to trap recordings, where less than ten individuals were caught (see text), (hsi = habitat selection index). - A = Carabus convems, B = Nicrophorus vespilloides, C = Nicrophorus vespillo, D = Pedinus femoralis, E = Sisyphus schaefferi, F = Geotrupes vernalis