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Research on wild bees (Apiformes) was conducted in the Lower Oder Valley (NW Poland) at Natura 2000 sites near the border between Poland and Germany. The analysis involved 3 landscape types with xerothermic and sandy grasslands, differing in the proportion of woody vegetation. In total, we collected there 4158 specimens of Apiformes, representing 180 species. We have proved that mid-forest grasslands with a high proportion of thermophilous broad-leaved forests and xerothermic shrub communities are equally attractive to wild bees as open habitats (sandy grasslands, xerothermic grasslands/heaths). We observed varied responses of wild bee species with specific functional characteristics to increasing proportion of woody vegetation. The grasslands surrounded by forests were characterized by the highest number of cleptoparasitic species. In contrast, solitary and social bee species preferred forest-steppe habitats. However, in open habitats, solitary bees were the most abundant. Moreover, open habitats were distinguished by the highest number and abundance of rare species. Active protection of thermophilous grasslands is crucial for biodiversity conservation, also with respect to the natural resources of Apiformes. Preservation of biodiversity in threatened xerothermic and sandy grasslands should be one of the key objectives of nature conservation in European countries. Currently, more and more actions are undertaken to improve their condition and to restore those particularly valuable and threatened habitat types.

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: Thysanoptera) on xerothermic grasslands on South-East Poland. 19th International Congress of Entomology, Beijing, China, 1992). CFS 178, 3-7. Study on the thrips fauna (Insecta: Thysanoptera) on xerothermic grasslands on South

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The authors give a report on the results of the regular mite collectings made between 1990 and 2003 on ornamental trees and shrubs, on streets, in parks, in green spaces of housing estates, in botanical gardens and private gardens, in various localities of Hungary. This survey also covers material collected in soft fruit orchards and vineyard, on a winter barley and winter wheat field by Malaise-trap, a nature conservation area (xerothermic grassland) by D-Vac (vacuum insect sampler) and in stored plants. Representatives of 31 families were identified. Out of 113 mite species 52 species (e.g. Neoseiulus setulus (Fox, 1947), Typhlodromus cryptus Athias-Henriot, 1960, Typhlodromus georgicus Wainstein, 1958, Typhlodromus kazachstanicus Wainstein, 1958, Lorryia atyeoi Baker, 1968, Tydeus praeditus Livshitz et Zapletina, 1972, Neophyllobius bialagorensis Bolland, 1991, Rhyncaphytoptus platani Keifer, 1939, Tarsonemus piliger von Schlechtendal, 1898) are new for the Hungarian fauna.

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349 357 Kucharczyk, H. and Zawirska, I. (1994): Study on the thrips fauna ( Insecta: Thysanoptera ) on xerothermic grasslands on South-East Poland. 19th International Congress

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(Insecta: Thysanoptera) on xerothermic grasslands of South-East Poland. Sonderdruck aus CFS Courier 178, 3–7. Zawirska I. Study on the thrips fauna (Insecta: Thysanoptera) on xerothermic

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69 77 Czarnecka, J. 2004. Microspatial structure of the seed bank of xerothermic grassland — intracommunity differentiation. Acta Soc. Bot. Pol. 73: 155

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