Abstract

Numerous species interactions abound within coral reefs, resulting in either positive, negative, or neutral outcomes. During an exploratory dive on the northwest coast of Puerto Rico, divers observed a colonial field of the yellow pencil coral, Madracis auretenra, engulfing a number of giant barrel sponges, Xestospongia muta. This took place on a reef with strong hydrodynamic forces. The nature of this interaction is complex, and may be an adaptive behavior for the coral, since the sponge offers shelter, additional substrate, and exposure to inhalant currents that may carry food and nutrients. This comes at an expense for the sponge, since it has to modify its typical morphology to accommodate the coral’s growth.

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