Figure 2. Frequency distribution of the photosynthetic response of Colobanthus quitensis individuals from three different origins (South America 53.5°S, Shetland Islands 62.1°S and Antarctic Peninsula 67.5°S).

Estimations were performed under both the current thermal conditions of each site (t₀), and during three consecutive simulated growing seasons (t₁:t₃), where all individuals experienced their respective projected temperatures. The extent of the mean temporal response for each population is expressed as the mean delta value (±SD) between the photosynthetic responses at the last simulated warming season (t₃) and their values under the current thermal conditions (t₀). Different letters between these values refer to significant differences (Tukey HSD tests, α = 0.05) between populations. Bonferroni correction was applied due to multiple comparisons.