Fig. 4: Maintenance of photosynthetically active tissue in the seven most abundant species over the season.
From: Growth of alpine grassland will start and stop earlier under climate warming
Species-specific photosynthetic vigour index (mean ± SE) was calculated from number, size, green area, and chlorophyll content of leaves, in monoliths (+2 m, +4 m) and field plots. Data are scaled to percent of the maximum per species and group. Values were assessed for the same 1–3 individuals per experimental unit (8 monoliths for +4 m, +2 m, and 5 field plots) across the season. Arrows on the right side highlight the difference between the maximum and the last value of the season within the corresponding group. Asterisks indicate P < 0.05 (two-sided t tests, detailed statistics in Supplementary Table 2). Full species names are in Table 2. Illustrations provided by Oliver Tackenberg.
