2.1 | Distribution data
Information on water body location and type (i.e. lentic or lotic) and the composition of local assemblages of odonates across Europe were compiled from data obtained in an extensive literature survey (Appendix 1). Only records of breeding species were included, to obtain species sets associated with the considered water bodies. Breeding records covered tandem pairs, ovipositing females, larvae, exuviae and recently emerged adults (Bried, Dillon, Hager, Patten, & Luttbeg, 2015), resulting in 5,703 records of 99 species of odonates and 524 local assemblages across 28 European countries. After assemblages with less than three species were excluded (to obtain reliable estimates of assemblage means), the final dataset comprised of 518 local assemblages of dragon- and damselflies (Fig. 1; 337 lentic, 181 lotic).