Fig. 1.
(A) Percentage cover, (B) new growth, (C) sclerophylly index (SI; dry matter per surface area), (D) maximum quantum yield of PSII (Fv/Fm), (E) maximal non-photochemical quenching (NPQmax) and (F) methanol-extractable UV-absorbing compounds (MEUVACs) of the three bryophytes (the mosses Hylocomium splendens and Polytrichum commune, and the foliose liverwort Barbilophozia lycopodioides), studied in plots exposed to two radiation regimes (control or enhanced UV-B, as indicated) under two different water regimes (M, mesic plots; D, drier plots). Means ± s.e. are shown (n = 4). The main factor effects (two-way ANOVA) of water regime (WR) and UV-B radiation (UV), and the interactions between both (WR×UV), are indicated for each species when significant (***P < 0·001; **P < 0·01; *P < 0·05). Differences between control and +UV-B plots for each species and water regime separately are shown over the corresponding bars (Student́s t-test adjusted with Bonferroni; °P <0·025; °°P < 0·005).