Figure 4
Carbon (a), and Nitrogen (b) stable isotope ratio, percent carbon (c), percent nitrogen (d), and carbon to nitrogen ratio (e) of Xenia umbellata colonies under experimental phosphate 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 between weeks (p < 0.05, pairwise comparison t-test, Bonferroni adjustment). Error bars represent standard errors. 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.
