Figure 3. Microtopography of the contact border between the massive coral Porites spp. and turf algae.

Note the little depression at the contact border, the healthy looking coral surface is slightly elevated above the neighboring algae. The bubbles lining up at the contact border are indicative of a combined effect of reduced diffusive transport due to increased DBL thickness and oxygen supersaturation. The picture was taken at ∼4 m depth.