highly significantP < 0.001
IRMS of pseudobulbs and leaves 15 N enrichment of ant‐inhabited pseudobulbs after labelling was highly significant compared with the control (atom% 15 N pseudobulbs: GLM estimate 11.04, t ‐value 0.22, df = 48, P < 0.001) at each time point (atom% 15 N pseudobulbs day 1, 2, 4, 8: GLM estimate 2.91, t ‐value 5.69, df = 48, P < 0.001).