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Comparison of algal zone (A) and sea urchin zone (B). Edmunds and Carpenter (4) document the transition from the former to the latter at five sites along the north coast of Jamaica. Note abundance of the seaweed Sargassum in (A), and the presence of the sea urchin Diadema and coral recruits in (B). Photograph credits: (A) Robert C. Carpenter; (B) Peter J. Edmunds.
