Figure 2
Gross- (Pgross), net photosynthesis (Pnet), and respiration (R) of Xenia umbellata under experimental conditions: only temperature increase without PO4 addition (control), 1 µM PO4 + temperature increased from week 3 onwards (1 µM PO4), 2 µM PO4 + temperature increased (2 µM PO4), and 8 µM PO4 + temperature increased (8 µM PO4). Letters indicate significant differences for Pgross and R between weeks and asterisks indicate significant differences between treatments per time (p < 0.05, pairwise comparison t-test, Bonferroni adjustment). Error bars represent standard deviations. Dots represent the individually measured data points. The vertical line indicates the start of the temperature treatment and the average temperature for all tanks for the different time points is given on top of the graph.
