Thirty years ago, Peter Edmunds began doing annual surveys of underwater life off St. John, one of the U.S. Virgin Islands. The marine biologist from California State University, Northridge, marked out a 20-meter transect along an underwater reef. Each summer he has photographed what grew there, including an expanded transect of 40 meters.
https://www.science.org/content/article/how-does-caribbean-fire-coral-thrive-others-vanish
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