S. Mahunka szerk.: Folia Entomologica Hungarica 55. (Budapest, 1994)

FOLIA ENTOMOLOGICA HUNGARICA ROVARTANI KÖZLEMÉNYEK LV 1994 p. 65-91 Hymenoptera species in Lipara galls (Diptera, Chloropidae) in Hungary* Á. Dely-Draskovits, J. Papp, Cs. Thuróczy and T. Vásárhelyi Hymenoptera species in Lipara galls (Diptera, Chloropidae) in Hungary. - Aiming to assess the species population of Hymenoptera and Diptera developing in Lipara galls in Hungary, 3893 galls were collected from 26 localities; 412 galls produced Hymenoptera. Twenty species belonging to 10 families were identified, where parasitoids developing in Lipara pupae were found most common, yielding 90% of the total frequency of occurrence. The relevant literature written in Hungary or abroad is fully presented. Results on associational relations and extent of specialization among Hymenoptera living in galls are provided, with comments on reed management and their role in reed degradational processes, considering environmental aspects. The host of Baryproctus baripus (Marshall 1885) is ascertained. INTRODUCTION In the last decades all over Europe attention was called to reed and reed stands. This attention is due to the fact that they are environmentally endangered, an important target of environmental protection, and to a less extent that reed is used in industry. Research concerns reed belts as a type of reed vegetation, food of numerous phytophagous animals, as well as habitat and food resources of others. Galls of Lipara species, beyond influencing the vegetative development of reed, play an important role in biocoenosis. Some of the insects developing in the reed stem find their food here, and for several others reed provides a special microhabitat. During our investigations, since 1985, special attention was paid to flies making the dipteran galls, to the inquiline organisms living together with the gall-inducing species and to their parasitoids. The main objectives of our research were to know more about the Hungarian species population of Hymenoptera living in the Lipara galls and to analyze their distribution and frequency. We intended to inspect the sphere of host species for parasitoid and hyperparasitoid species, and the extent of their specialisation. We were interested in the density of parasitoid and Lipara species to get indirect information on how it influences the degradation of the reed vegetation. Special importance should be attached to our results due to the fact that in Hungary such investigations have been carried out only in limited number. Furthermore, new results might change our view on the role of the reed stands in maintaining biodiversity. * This publication was supported by OTKA (Hungarian Research Fund) No. 3160. Thanks are due to G. Hegyessy for identifying the representatives of Platygastridae.