In the bottom figure on p. 1725, Caribbean sites are purple (not green as described in the legend), and some data points are not seen because of superimposed dots. Otherwise, the labels point to the dots in order. For example, the Bahamas and eastern Panamá are represented by the purple dot partly showing above the red dot for the Main Hawaiian islands and Florida Keys. The lettering for the Outer Great Barrier Reef (Outer GBR) should be black.

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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.