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Transportation infrastructure may be the most important driver of social and economic development, but it is a major cause of environmental change in landscapes. The main objective of this paper is to report road edge effects on isopods of Hungarian highway verges. We examined the isopod diversity along five highways (M0, M1, M3, M5, M7) while accounting for road edge proximity and the adjacent areas. Double-glass pitfall traps were set in a total of 15 sites and at three distances from the edge of the roads next to different types of adjacent areas. We found differences between ecological parameters of isopod communities in relation to adjacent areas as well as to road edge proximity. The highest diversity was observed near urban areas, while the lowest was near the arable fields. Isopod diversity increased with decreasing distance from a road. Species diversity of different types of verges based on adjacent areas varied strongly in relation to road edge proximity. A medium distance (40 m) from roads had a positive effect on species richness, while verges next to arable fields were the most species-rich habitats. The general conclusion of this study is that highway verges provided suitable environment conditions for generalist isopod species but may be a limiting factor for specialist isopods. Moreover, highway verges function as corridors for isopods. The proximity of roads and urban areas positively affected isopods, and verges close to roads and urban areas are considered as an attractive environment for isopods in heterogeneous roadside verges.

Effects of roads and adjacent areas on diversity of terrestrial isopods of Hungarian highway verges