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).