Fig. 4.

δ¹³C and δ¹⁵N values (mean ± s.e.) of plants and ectomycorrhizal (ECM) fungi grouped in different species and/or nutritional modes at site A (A, B) and site B (C, D). Different letters denote significant differences between species and functional groups according to Bonferroni corrected pairwise t-tests (P < 0·01). Cymbidium goeringii and C. lancifolium are chlorophyllous; C. macrorhizon and C. aberrans are achlorophyllous. Mycoheterotrophic (MH) orchids include Cyrtosia septentrionalis and Lecanorchis nigricans; and MH non-orchids are represented by Monotropa uniflora. For details on autotrophic (AT) non-orchids, AT orchids and ECM fungi, see Tables 1, S1 and S2.