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Survey Quadrat on Coral Reef

A white square survey quadrat frame rests on a branching coral reef underwater, with sunlight filtering through the surface and a sandy seafloor visible in the background.

A coral survey grid on a reef at midday, a square quadrat frame laid over branching coral with a line running off across the sand, sunlight breaking into shafts from the surface, blue water and a far drop-off, 24mm underwater housing See more

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