Freshwater ecosystems represent an unparalleled diversity of habitats and species, but the actual distribution of many species remains obscured or incomplete. The aim of the survey was to contribute to the knowledge on the fauna of lesser-known areas and fill the gaps in the distribution maps of the species. The dataset is based on a one-year-long study surveying 60 locations from different drying river networks that represent different ecoregions in Central Europe: Balcanic (Croatia, 15 sites), Continental (Czechia, 20 sites) and Pannonian (Hungary, 25 sites). Multihabitat sampling approach was applied for collecting stream-dwelling macroinvertebrates. Individuals were identified to the lowest possible taxonomic level, typically to species level. The dataset includes 1827 geo-referenced occurrence records based on presence-absence data of 164 taxa across Gastropoda, Hirudinea and various groups of Insecta (Coleoptera, Hemiptera, Megaloptera, Odonata, Trichoptera) along with geographical information on the sampling sites, and details of the taxonomy of the species. The data can support future studies in ecology, biogeography and nature conservation.

Department of Biology Faculty of Science University of Zagreb Horvatovac 102a Zagreb Croatia

Department of Botany and Zoology Faculty of Science Masaryk University Kotlarska 2 Brno 611 37 Czech Republic

Department of Environmental and Landscape Geography Eötvös Loránd University Pázmány Péter sétány 1 C Budapest H1117 Hungary

Department of Hydrobiology University of Pécs Ifjúság útja 6 Pécs H7624 Hungary

HUN REN Balaton Limnological Research Institute Klebelsberg Kuno 3 Tihany H8237 Hungary

Institute of Aquatic Ecology HUN REN Centre for Ecological Research Bem square 18 C Debrecen H4032 Hungary

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