S. Mahunka szerk.: Folia Entomologica Hungarica 59. (Budapest, 1998)

Zoogeographical analysis of the Orthoptera fauna... Orthoptera Ensifera Caelifera Fig. 1. Faunal elements of Orthoptera species of the Bükk Mts (N Hungary) Siberian type in the Caelifera group may be explained by similar ideas. Most of these species are mainly attached to the open plant associations (forest steppe, steppe), and expansive representetives of them ("Angara fauna") reached the Carpathian Basin through faunistic migrations of East-West direction. In the further analysis, vertical zonality of the major plant associations and estimated spreading frequency of the Orthoptera species were also taken into consideration. Accordingly, three major vegetation zones were indicated (not sticking to real height sea level because of the importance of exposure): I. forested steppe zone; II. sub-mountainous zone; III. mountainous zone. Species were divided into four categories: rare (1), sporadic (2), frequent (3) and common (4). Estimated frequency of the individual categories are given for the mountains as a whole and the four individual zones, too (Table 1). In the evaluation, the categories 1 and 2 as well as 3 and 4 were contracted, respectively. The total numbers of species are 59 and 16 in the categories 1-2 and 3-4, respectively. These values are as follows in the individual zones: I - 55:13, II -45:12, III - 31:9. The advance of the number of species of the two groups seems to be characteristic, and this experience becomes unambiguous for the distribution of the faunistic elements (Fig. 2). Fig. 2. Distribution of faunal elements of Ortopthera species of the Bükk Mts (N Hungary)