Leigh and Clare surveying a reef in Belize, May 2009. Leigh is measuring coral disease prevalence (the proportion of coral colonies infected with various diseases. Clare is shooting video of the seafloor. She will then analyze the video to determine the portion occupied by corals, macroalgae, sponges, etc. Note how much of the bottom is covered by fleshy macroalgae. A sign of the poor health of this reef.
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