Figure 5. NIFT responses of Lobophora variegata collected from the reef.

Examples of the NIFT response to (A) NO₃ ⁻ addition of a L. variegata leaf collected at Playa Kalki, (B) NH₄ ⁺ addition of a L. variegata leaf collected at Buoy 0, and (C) PO₄ ³⁻ addition of a L. variegata leaf collected at Buoy 0. The graphs show the time courses of steady-state fluorescence, F_t (+); maximum fluorescence, F′_m (×); the quantum yield of photosystem II, Φ_PSII (∗); and non-photochemical quenching, NPQ (○). Vertical dashed lines indicate the timing of the control addition (0 µM) and different nutrient additions (all at 100 µM).