FIGURE 1.

Overview of the experimental design. Corals sampled at shallow and mesophotic depths were distributed across three conditions (Control, incubated in ¹⁵N for 5 h, and maintained at 30°C for 1 week × incubated in ¹⁵N for 5 h). The seawater used for the incubations was enriched with 3 μM of either ¹⁵NH₄⁺, ¹⁵NO₃^–, or ¹⁵N-DFAA. The first three species [Galaxea fascicularis (Gal), Seriatopora hystrix (Ser), Stylophora pistillata (Sty)] are hard corals and the last three [Litophyton arboreum (Lit), Rhytisma fulvum fulvum (Rhy), Sarcophyton sp. (Sar)] are soft corals. Colors of the batches match with those displayed on the figures. DFAA = dissolved free amino acids.