Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 88. (Budapest 1996)
Madari, B., Kiss, I. ; Korsós, Z.: Community-structure parameters of millipedes (Diplopoda) in five different habitats
To estimate the dominance of the species, percentages were calculated from the BERGER-PARKER dominance index: D% = d x 100. The BERGER-PARKER index is d = N MAX /NT, where N MAX stands for the abundance of the species, and NT is the total number of species (SOUTHWOOD 1984). Species composition of each sampling area and the relative frequency of their occurrence have been represented on separate dendograms and have been evaluated together. The dendrogram was made with the BIODIV 4.1 ecological statistical program (Exeter Software). Within the program we used the CZEKANOWSKI similarity index: Jcz = 2a/((a+b)+(a+c)), where a is the number of common species in two samples, b and c stand for the number of species in the two samples, respectively. RESULTS AND DISCUSSION In the pitfall traps, in the Tullgren-samples and in the hand-collected samples seven species have been found belonging to three orders of the class Diplopoda: Polyxenida: Polyxenus lagurus (LINNAEUS, 1758) (only in the Tullgren-sample) Glomerida: Glomeris hexasticha BRANDT, 1833 Julida: Cylindroiulus boleti (C. L. KOCH, 1847), Megaphyllum projectum (VERHOEFF, 1894), Megaphyllum unilineatum (C. L. KOCH, 1838), Ommatoiulus sabulosus (LINNAEUS, 1758), and U neiger foetidus (C. L. KOCH, 1838) All these species are common members of the diplopod fauna of Hungary and their general ecological tolerance is wide (KORSÓS 1994). Based on the species saturation curve (Fig. 1) it can be assumed that we managed to find all the species living in these biolopes. However, although one species, Polydesmus complanatus LINNAEUS, 1761 is a common and characteristic member of the Hungarian fauna, and has already been reported from the surroundings of Gödöllő (KORSÓS 1990), in this survey we could not find any specimen of it. Relative abundance of the Diplopoda species (Table 1) In the five sampling areas altogether 2143 millipede specimens have been found in 1992 and 1993. Most millipedes were found in the robur dominated area each year. This is a stand in balance that is still not in the stage of senescence. ILOSVAY (1983), in his work on the beech ecosystem of Farkasgyepü has also experienced that such areas are optimal for decomposers. The younger the vegetation was, the fewer the number of millipede specimens were found in the given area. The smallest number of millipedes were found in the area surrounded by arable land. Since in arable land frequently bothered by cultivation millipedes cannot find sufficient conditions, in these areas few or none of them can be found (see e. g. BAILEY & DE
