Substrate destruction and sediment production by the boring sponge Cliona caribbaea on Grand Cayman Island

The boring sponge Cliona caribbaea is ubiquitous on the shallow terraces around Grand Cayman Island, British West Indies, occurring as brown sheets covering and growing over both live corals and hard substrate. Throughout the zone of the radial grooves, on the southwest corner of Grand Cayman, C. caribbaea covered 5% of the total bottom area between -1 and -10 m. Values up to 10% occurred commonly. Lateral extension rates were 4 cm/yr. The …