My apologies, I should have inferred from the question, that you also wanted an answer, not just the confirmation that I was capable of providing it. To answer your question, grazing halos are barren areas of sand that surround coral patch reefs in otherwise continuous seagrass plains. They form due to predator avoidance by herbivorous fish and echinoderms that preferentially graze seagrasses close to the safety of the reef structure. Grazing halos are readily visible from satellite and aerial imagery and halo size may be indicative of local predator abundance.
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