Journal
JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM
Volume 95, Issue 5, Pages 1017-1024Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S002531541400188X
Keywords
Caribbean; coral reefs; Diadema antillarum; population recovery; Puerto Rico
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Funding
- Center for Applied Tropical Ecology and Conservation (NSF grant HRD) at University of Puerto Rico, Rio Piedras Campus [0734826]
- Direct For Education and Human Resources
- Division Of Human Resource Development [0734826] Funding Source: National Science Foundation
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The mass mortality suffered by the sea urchin Diadema antillarum between 1983 - 1984 is considered one of the major causes of coral reef degradation in the Caribbean. Its near disappearance resulted in a disproportionate growth of macroalgae that has led to a 'phase shift' from coral-to-algal dominated reefs. The close relationship between this echinoid and the functioning of coral reef ecosystems makes it imperative to better understand the potential for recovery of its populations. From 2009 to 2011, we assessed the density and size structure of D. antillarum in various reefs where previous population data were available. Results indicate a modest increase in density in all localities with respect to the last time they were surveyed in 2003/2004. Nevertheless, density values are still lower than values reported for the island prior to the die-off. Overall density did not surpass 1.49 ind. per m(-2), and did not change considerably during the studied period. Lack of population growth coincided with a lack of juveniles; suggesting that population growth at the studied sites may be limited by the number of individuals recruiting into the juvenile stage.
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