Janus Pannonius Múzeum Évkönyve 43 (1998)( Pécs, 1999)

Természettudományok - Nagy, Antal: Data on the Orthoptera fauna of the Villány Hills, South Hungary

44 A JANUS PANNONIUS MÚZEUM ÉVKÖNYVE 43 (1998) Table 2a: Number of individuals per samples in 1997. Szársomlyó Hill Fekete НШ Csukma Tenkes Hill area 1 2 4 5 6 8 10 12 date of sampling Jul. Aug. Jul. Aug. Jul. Aug. Jul. Aug. Jul. Aug. Jul. Aug. Jul. Aug. Jul. Aug. Phaneroptera nana 1 Leptophyes albovittata 1 4 3 2 1 Tettigonia viridissima 1 1 Platycleis grisea 1 4 1 5 3 111 3 3 4 8 4 3 Bicolorana bicolor 5 2 13 1 Pholidoptera griseoaptera 1 Pachytrachys gracilis 2 Rhacocleis germanica 2 2 3 2 26 4 6 2 2 8 2 4 1 Saga pedo 1 2 Oecanthus pellucens 5 4 - 1 1 2 Pezotettix giornae 17 4 Calliptamus italicus 8 1 2 33 12 7 4 1 4 1 Oedipoda coerulescens 1 9 1 6 3 3 Stenobothrus lineatus 11 1 - 54 18 1 12 11 2 2 35 1 5 Omocestus haemorrhoidalis 8 1 Glyptobothrus biguttulus 7 12 2 4 5 18 1 2 Glyptobothrus brunneus 3 2 1 2 3 Chorthippus paralellus 2 1 Euchorthippus declivus 6 - 16 28 9 3 6 sum. 19 32 15 7 110 44 38 43 64 15 36 32 61 21 29 13 completed with picking up single individuals as well. Most of the collected orthopteras were identified in the field accordig to HARZ (1969, 1975) and NAGY, В. (1969). After the identification the animals were let loose. Quantitative samples were taken only in 1997, when 8 areas were investigated (Table 2a). In 1998 the number of sampling areas were 13 (Table 2b), but the quantitative sampling was not possible because of the adverse weather during the period of the larval developement. The biogeographical range, faunal type, life forms, relative abundaces in Hungarian Orthoptera fauna and categories of abundance of species were determined according to RÁcz (1998a) (Table 1). Distribution of these categories and Ensifera ratio were given in percentage of relative frequency (quantitative samples in 1997) or percentage of presence (qualitative samples in 1998). The percentage of presence means the presence of a given species or group of species (eg. Ensifera, chothobiont life form, etc.) devided by all presences of the total species set, and this number is multiplied by 100. The distribution of the faunal types is represented with the percentage deviation from the avarage. The deviation means the difference between the value of a given area and the overall avarage of the Hills (Fig. 2) (VARGA & GYULAI 1978). The temporal constances of the species were calculated from those data of areas where all the 5 samplings were made during the 2 years. Results and discussion 29 species of two Orthoptera orders (Ensifera: 13, Caelifera: 16) have been found during the 2-year investigation. The former studies mentioned only 19 species all together. 5 of these 19 species have already dissappeared because their biotops have been decreased (Table 1). Most of the Orthoptera species can be devided into two major faunistic types: the Siberian and the Mediterranean spreading circles. South-western boundaries of the area of Siberian elements tend to the southern boundary of the steppe zone, and these are the northern boundaries of the Mediterranean elements and the mediterranean climatic zone (Adamovic line) (RÁcz 1998b). This idea substantially corresponds to the concept of UVAROV (1929) concerning the origin of Orthoptera fauna of the Palearctic and Europe. These boundaries cross through Hungary, therefore elements of both major faunistic types can be found. The ratio of the mediterranean elements is the higest in S Hungary, because of the