ALT F I G U R E 4. Summary of oyster-seagrass interactions that modulate species response to environment in co-culture, demonstrating how sign and magnitude of interactions shift from one environmental context to another (ambient, 17.8°C and 7.91 pH; warm, 19.1°C and 7.91 pH; low pH, 17.8°C and 7.53 pH; and when low pH and warming are combined, 19.1°C and 7.53 pH). Arrows denote significant species interaction effects within each environmental context, showing both positive (solid black arrows) and negative (dashed red arrows) species interactions. Arrow thickness indicates the relative magnitude of the species interaction effect, with thicker arrows indicating a stronger effect. The specific traits impacted by species interactions are listed adjacent to arrows (seagrass traits: Belowground biomass, leaf growth rate, and clonal shoot reproduction; oyster traits: Condition index).