S. Mahunka szerk.: Folia Entomologica Hungarica 43/1. (Budapest, 1982)

FOLIA ENTOMOLOGICA HUNGARICA ROVARTANI KÖZLEMÉNYEK XLIII. 1. 1982 p. 43-54 Auchenorrhyncha of a sandy soil mosaic-grassland: Quantitative relations, bionomic and ecological valence data By Gy. GYÖRFFY (Received December 15, 1981) Abstract: In 1977-1980, from among the 94 leafhopper species collected, in a mosaiccomplex sandy soil grassland, 66 species were found on the sand hills and 71 in the wind furrows. 4 species were important in both biotopes, besides them 6 species in the wind furrows and 8 on the sand hills were dominant. Kelisia perrieri Rib, is a new datum in Hungary. The leafhopper community is divided according to wintering, voltinism and ecological valence. The qualitative and quantitative changes of the leafhopper groups of different ecological valence follow the successive changes of plant communities. Introduction Complex ecological investigations have been organized by the Department of Zoology of the József Attila University in a sandy soil grassland in the area of Bugac-puszta, in the Kiskunság National Park since 1976 (MÓCZÁR et al., 1980). It was discovered from the results, similar to investigations of other authors ( WEIGERT and EVANS 1967; ANDRZEJEWSKA, 1971, 1974; HEWITT and BURLESON, 1975, 1976; HAAS, 1976; HOKKANEN and RAATIKAINEN, 1977; and others), that Auchenorrhyncha is the first group among the primary consumer populations in different grass types as regards its abundance, and the second important phytophagous group after Orthoptera as regards its biomass (GALLÉ et al., 1981). From the two terrains well separated, the leafhoppers of the sand hills (upper terrain) were investigated according to species composition, species dominance, bionomics and ecological valence on the basis of the material of two years in previous paper (GYÓRFFY, 1980 A). In the present paper my aims are to make similar elaboration of the leafhopper community of the deeper terrain (wind furrows), and to complete the results of the previous paper with the data of 19791980. Further aim is to investigate the successional changes of leafhopper populations with different ecological valence according to the changes caused by succession taking place in the plant community during the 4 years. Investigated area and methods The area is a mosaic-complex grassland, divided into wind furrows and sand hills. The height, microclimatic conditions and plant communities of the two terrains are highly different (KÖRMÖC ZI et al., 1981). The plant associations of the higher sand hills are Festucetum vaginatae danubiale normale, degraded Potentillo-Festucetum pseudovinae danubiale euphorbietosum sequerianae facies and Bromus tectorum facies. The 1.5-2 m deep wind furrows are partly covered with Festuca pseudovina facies of Lolio-Potentilletum anserinae, and in the deepest parts the plant cover is