A Duna-Tisza közi homoki sztyepprétek vadméh-közösségének hosszú távú változásai

Abstract

Between 2006 and 2008, 972 Apoidea specimens have been collected that belonged to 93 species. Within the wild bee community the ratio of the Halictus and Lasioglossum species (19,45%), and the Megachile species (23,36%) are significant and also the density of the bumble bees (Bombus species) with 19,65%. During the collection in the years of 1977-78-79, 102 taxa were found in the Kis-Bugac barren. In the samples of six years, 141 species and one variation were shown. Having compared to the samples of 1977-78- 79, the results of the collection conducted 29 years later proved 53 species to be coommon. Faunal similarity of the two periods according to the Jaccard-index is 0,373. The most important community components found were the holomediterranean (24 species) and palearctic (21 species) in the years of 2006-2008. In the years of 1977-1979 the palearctic (33 species) and european (17 species) taxa were the most important fauna elements. According to the climate-tolerance assessment - during both collecting periods - the ratio of the Thermophile species was the most significant. According to the frequency index in the second collecting period, the ratio of the rare and very rare species have increased. In both collecting periods, the most important community component was the medium flying period Apoidea species.