Fig. 3
From: Stoichiometry of carbon, nitrogen and phosphorus is closely linked to trophic modes in orchids
Concentration of phosphorus (P) in groups of species representing different biogeography, phylogenetic groups, and trophic modes. median (circle), average (horizontal bar), quartiles (box) and value range (whiskers); autotrophy (AT), mixotrophy (MX) and mycoheterotrophy (MH) and respective reference autotrophic non-orchid species (REF). Orchids include AT, MX and MH species; Ericaceae include MX and MH species, and B&G (Burmaniaceae and Gentianaceae) includes MH species only in our species set. The letters above the bottom line show the significant differences at p < 0.05 based on the post-hoc Games-Howell test after Welch ANOVA showed significant differences between groups (F = 178,9; df = 123,7; p < 0.001)