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Science 16 November 1973:
Vol. 182. no. 4113, pp. 715 - 717
DOI: 10.1126/science.182.4113.715
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Articles

Grazing by the Echinoid Diadema antillarum Philippi: Formation of Halos around West Indian Patch Reefs

John C. Ogden 1, Richard A. Brown 1, and Norman Salesky 1

1 West Indies Laboratory, Fairleigh Dickinson University, Box 4010, Christiansted, St. Croix, U.S. Virgin Islands 00820

Between patch reefs and marine grass communities there is normally a zone or "halo" of heavily grazed grass 2 to 10 meters wide. Grazing by the echinoid Diadema antillarum Philippi during nocturnal migrations off the reefs is found to be the major factor in the formation of halos.


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