Authors:F. Kozár, F. Samu, É. Szita, Z. Konczné Benedicty, B. Kiss, E. Botos, K. Fetykó, D. Neidert, and A. Horváth
Sixty three scale insect species are reported from the Mezőföld area (Hungary), a mosaic area of predominantly intensive agricultural land and scattered grassland and forested areas. In comparison, from the Kőrös-Maros National Park, dominated by natural grassland areas, only 31 species were reported. From the Mezőföld data 4 species were new for the Hungarian fauna and almost all species from Mezőföld were new for the given locality. The Mezőföld fauna could be characterised by more rare species and a lower Global Frequency Value (=higher level of species rarity), suggesting a higher overall conservation value. Scale insect species numbers show a strong negative correlation with the ratio of woody plantations. There was an overwhelming presence of a steppic scale insect species in grassland assemblages, and impoverished woody fauna of the studied wooded areas. However, there was no correlation with plant species number, with the area of natural vegetation, or with the area of loess steppe patches, which shows that the original loess step fauna is impoverished, heavily disturbed. In summary we can say, that the Mezőföld loess scale insect fauna is relatively poor, could be characterised by widely distributed, mezophilous, common species. However, it also has several important steppic elements, and therefore deserves protection.
Authors:F. Samu, F. Kádár, G. Ónodi, M. Kertész, A. Szirányi, É. Szita, K. Fetykó, D. Neidert, E. Botos, and V. Altbäcker
Recent environmental and land use changes have made wildfires more frequent in natural habitats of the Kiskunság Sand Ridge on the Hungarian Plain. In a study initiated 2.5 years after an extensive fire that destroyed half of the area of a sand grassland — juniper, poplar forest steppe habitat, we assessed the effects of fire on two generalist arthropod groups: spiders and carabid beetles, as well as on the vegetation. Utilizing the natural experiment situation, samples were taken by pitfalls and suction sampling during a 1.5 years period in four 1 ha blocks, two of which were on the burnt part of the habitat, and two in the unburnt control. At the time of the investigation, in the burnt area the vegetation in the grass layer showed a quick but not complete recovery, while the canopy layer of the juniper bushes burnt down with no sign of regeneration. Carabid beetles and spiders showed differences in recovery after fire. In the carabid assemblages of the burnt parts — compared to the unburnt control — there were over three times more beetles, out of which significantly more represented the macropterous life form and granivorous feeding strategy. There was a higher ratio of pioneer species and a simplified assemblage structure in the burnt area, which meant that the conservation value of the carabid assemblage became lower there. In contrast, for the spider assemblage quantitative changes in abundance and species numbers were not significant, and the differences in species composition did not lead to a decrease in conservation value. Spider species in the burnt plots could not be described as pioneer species, rather they had ecological characteristics that suited the changed vegetation structure. Comparing the two groups, to repopulate the burnt areas, dispersal abilities proved to be more limiting for carabids. However, in both groups a strong assemblage level adaptation could be observed to the postfire conditions. In spiders, species with a stratum preference for the grass layer prevailed, while in carabids individuals with granivore strategy gained dominance. Thus, despite the differences in their speed, basically both assemblages tracked vegetation changes. The effect of future fires will depend on their scale, as well as land-use practices, such as grazing, that interact with fire frequency and recovery. If extensive fires in the future permanently change the vegetation, then it would also lead to a fundamental change in the arthropod fauna.