Figure 2.

Biomass as carbon (C; mg L⁻¹) as a function of log nitrogen (N); (A) and phosphorus (P); (B) concentrations (µg L⁻¹). Regressions performed using all data and color coded by P concentration (20 µg L⁻¹ P, orange circle; 40 µg L⁻¹ P, green triangle; 80 µg L⁻¹ P, blue square; 175 µg L⁻¹ P, cyan diamond; 350 µg L⁻¹ P, black triangle; and 700 µg L⁻¹ P, grey hexagon).