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Settlement of Diadema antillarum (Philippi, 1845) was studied at monthly intervals with artificial turf plates at six reefs along an inshore-offshore gradient in La Parguera, Puerto Rico, from February to April 2008, and from July to September 2008. Plates were placed at various
depths on individual mooring lines. From a total of 220 D. antillarum settlers, 217 were collected from the shelf-edge reefs (Old Buoy and El Hoyo). The remaining three settlers were collected at Media Luna, a mid-shelf reef. The optimal depth for D. antillarum settlement at
the shelf-edge was on the 9 m plates, with lowest settlement found on the shallower plates. Fouling of settlement substrate was shown not to be a major factor influencing settlement of D. antillarum on plates at inshore and mid-shelf reefs. Inner and mid-shelf reefs had higher abundances
of microinvertebrates, particularly lobsters. The inverse relationship between settlement by D. antillarum and other microinvertebrates warrants further analysis. Post-settlement mortality may be regulating populations of D. antillarum at the shelf-edge, while settler mortality
and/or low larval supply are two factors that may limit rapid recovery of D. antillarum populations at the inshore and mid-shelf reefs.
The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.