Fig. 4. Cover, relative abundances and richness of fleshy macroalgae (MA), hard corals (HC), octocorals (OC) and fish from reefs in the two study regions, plotted against water quality (WQI). Black and grey points indicate WT and PC reefs, respectively. High WQI values represent high nutrient concentrations and low values represent relatively clean water. Solid lines are linear regression fits. The value in each panel indicates the probability for a gradient effect