Abstract
Sponges mediate consolidation of Porites furcata rubble on shallow Caribbean reefs by quickly adhering to rubble and stabilizing it until carbonate secreting organisms can grow and consolidate it to the reef. Experimental investigations demonstrate that the entire cycle from (1) temporary binding of rubble by sponges, through (2) rubble consolidation by encrusting coralline algae, to (3) colonization of consolidated rubble by corals, can be completed within 10 months. Bound rubble both adds to vertical reef growth and also provides stable substrata for colonization by corals. Corals that colonize stabilized rubble are damaged less and survive better than on unstable rubble. Rubble that is not temporarily stabilized by sponges does not become bound to the reef, because continuous movement disturbs the consolidation process, and does not provide suitable substrata for settlement and growth of corals. Sponge-mediated consolidation of rubble may increase rates of reef growth and enhance reef recovery after damage. This new role for sponges in reef growth is not obvious from examination of the internal fabric of a reef frame. Spongemediated consolidation may help to explain geographic and temporal differences in growth and morphology among shallow reefs of ramose corals.
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Wulff, J.L. Sponge-mediated coral reef growth and rejuvenation. Coral Reefs 3, 157–163 (1984). https://doi.org/10.1007/BF00301960
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DOI: https://doi.org/10.1007/BF00301960