Understanding the impact of the changing proportion of land-use patterns on species diversity is a critical issue in conservation biology, and odonates are good bioindicators of these environmental changes. Some freshwater ecosystems that have been modified due to human activities can serve as important secondary habitats for odonate assemblages; however, the majority of studies addressing the value of secondary habitats in industrial and urban areas for adult dragonfly diversity have been limited to the local scale, and the value of such habitats for gamma diversity is still unclear. The aim of this study was to determine the relationship between human transformations of land use/land cover and dragonfly diversity. We interpolated the information based on dragonfly occurrence per grid cell and land cover data, indicating naturalness and degradation in 677 grid cells in the Czech Republic. Species richness did not correspond to habitat naturalness, but the occurrence of endangered species was significantly positively correlated with increasing naturalness; thus, habitat degradation and/or the level of naturalness significantly affected species composition, while species richness remained unchanged. Threatened species that occur predominantly in natural areas and threatened species with a dominant occurrence in degraded squares were also separated, which indicated that the conservation of the latter should be prioritised.

Department of Biology and Ecology Faculty of Science University of Ostrava Chittussiho 10 CZ 710 00 Ostrava Czech Republic

Department of Ecology Faculty of Environmental Sciences Czech University of Life Sciences Prague Kamýcká 129 CZ 165 00 Praha Suchdol Czech Republic

Institute for Research and Applications of Fuzzy Modeling University of Ostrava 30 dubna 22 CZ 701 03 Ostrava Czech Republic

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