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The degree of trophic plasticity in soil animals is intensely debated. We used stable isotope ratios ( 15 N/ 14 N, 13 C/ 12 C) of oribatid mite species from six oak (Quercus robur) forests to investigate (1) if trophic niches vary between forests and (2) the range of trophic levels spanned by oribatid mites. Using litter as baseline stable isotope signatures of most...