Disturbance history determines current beetle diversity • Deadwood amount and canopy openness play key roles • Diversity measures respond to different disturbance characteristics • Disturbance effects are diverse across temporal scales
Global or regional environmental changes in climate or land use have been increasingly implied in shifts in boundaries (ecotones) between adjacent ecosystems such as beech or oak-dominated forests and forest-steppe ecotones that frequently co-occur near the southern range limits of deciduous forest biome in Europe. Yet, our ability to detect changes in biological communities across these ecosystems, or to understand their environmental drivers, can be hampered when different sampling methods are required to characterize biological communities of the adjacent but ecologically different ecosystems. Ants (Hymenoptera: Formicidae) have been shown to be particularly sensitive to changes in temperature and vegetation and they require different sampling methods in closed vs. open habitats. We compared ant assemblages of closed-forests (beech- or oak-dominated) and open forest-steppe habitats in southwestern Carpathians using methods for closed-forest (litter sifting) and open habitats (pitfall trapping), and developed an integrated sampling approach to characterize changes in ant assemblages across these adjacent ecosystems. Using both methods, we collected 5,328 individual ant workers from 28 species. Neither method represented ant communities completely, but pitfall trapping accounted for more species (24) than litter sifting (16). Although pitfall trapping characterized differences in species richness and composition among the ecosystems better, with beech forest being most species poor and ecotone most species rich, litter sifting was more successful in identifying characteristic litter-dwelling species in oak-dominated forest. The integrated sampling approach using both methods yielded more accurate characterization of species richness and composition, and particularly so in species-rich forest-steppe habitat where the combined sample identified significantly higher number of species compared to either of the two methods on their own. Thus, an integrated sampling approach should be used to fully characterize changes in ant assemblages across ecosystem boundaries, or with vegetation change over time, and particularly so in species-rich habitats such as forest-steppe ecotones.
Understanding changes in global biodiversity patterns requires large-scale, long-term monitoring. However, there might be significant constraints in the analysis of long-term and spatially large data, especially when the methodology used differs (Gotelli & Colwell, 2001, 2011. The ability to make meaningful comparisons of the results of studies is severely hampered by great variation in the design of the sampling equipment and how it is used (Brown &
Wood pastures represent specific ecosystems across Europe with diverse ecological, agricultural, and socioeconomic roles. Land-use changes and the cessation of traditional management in conjunction with socioeconomic changes led to shifts in their spatiotemporal distribution. Despite a recent increase in scientific interest, data on historical patterns of wood pastures in many European locations remain insufficient. This study presents wood-pasture habitat continuity and analyzes changes in their distribution over space and time in selected parts of Slovakia. Simultaneously, we analyzed the relation of wood pastures to selected environmental and landscape features. To achieve this, we examined the historical distribution of wood pastures using aerial imagery from the 1950s. We thoroughly examined an area of 16,209 km2 to identify preserved wood pastures. To identify the present conditions and the spatial distribution of wood-pasture habitats, we compared the historical data with recent ortophotomaps. Based on landscape–ecological analyses of historical distribution, we determined prevailing environmental conditions of wood-pasture locations. The findings reveal that over 90% of wood pastures from the first half of the 20th century have now been lost or encroached and preserved in the form of a closed-canopy forest. In most of the encroached sites, we identified the presence of vital core veteran trees. For the identification of wood pastures and further analyses of the environmental variables, the ArcGIS 10.3 program was used; the R software was used for all statistical evaluations. The results show that the studied wood pastures were not established randomly, but were rather set within a certain landscape context, characterized by elevation, soil quality, and distance from settlements.
Wood pastures with pollard trees have been a common land-use type across Europe. The trees, besides having positive environmental effects on livestock, served as important source of fodder and wood. Pollarded wood pastures were hence a multifunctional, state of the art, highly productive farming ecosystems. Despite relatively drastic treatment, the trees regenerated quite well, and grew to relatively high-age. When pollarding lapses for longer period the wood pasture may confusingly resemble an ancient forest. Using aerial photographs of Slovakia from 1949-1950 we have identified 950 individual wood pasture localities with total area of 265.5 km 2 within the Self-Governing Region of Banská Bystrica. Majority of identified wood pasture habitats were actively managed in the first half of the 20th century. Nowadays, less than 2.5% has preserved its original structure, the rest has been abandoned (92.8%) or actively transformed into different land-use form. We conducted a field survey in order to identify historical pollarding within the Gavurky protected area, one of the last and best preserved wood pastures in Slovakia. By evaluating habitual features, we were able to confirm historical pollarding for more than 80% of present veteran trees. We provide framework for identification of pollarding in historical wood pasture localities, applicable in the conditions of long-term management cessation.
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