The Great Barrier Reef (GBR) is threatened by climate change and local pressures, including contaminants in nearshore habitats. This study investigated the combined effects of a GBR-relevant contaminant, the herbicide diuron, under current and two future climate scenarios on the coral Acropora millepora. All physiological responses tested (effective quantum yield (ΔF/Fm'), photosynthesis, calcification rate) were negatively affected with increasing concentrations of diuron. Interactive effects between diuron and climate were observed for all responses; however, climate had no significant effect on ΔF/Fm' or calcification rates. Photosynthesis was negatively affected as the climate scenarios were adjusted from ambient (28.1 °C, pCO = 397 ppm) to RCP8.5 2050 (29.1 °C, pCO = 680 ppm) and 2100 (30.2 °C, pCO = 858 ppm) with EC50 values declining from 19.4 to 10.6 and 2.6 μg L diuron in turn. These results highlight the likelihood that water quality guideline values may need to be adjusted as the climate changes.
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