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Mean delta 15N and 13C signatures (±1SD) for the carabids and wolf spiders collected in the Rotmoos glacier foreland in early (a) and late (b) pioneer stages. Species names: N. ger = Nebria germari, N. joc = Nebria jockischii, N. ruf = Nebria rufescens, O.cas = Oreonebria castanea, and Par. sp = Pardosa spp.
