The sponge Xestospongia muta offers shelter to the stony coral Madracis auretenra (Northwest Puerto Rico)


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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  1. Bak RPM, Criens SR (1981) Survival after fragmentation of colonies of Madracis mirabilis, Acropora palmata and A. cervicornis (Scleractinia) and the subsequent impact of a coral disease. Proc 4th Int Coral Reef Symp 2:221–227

  2. Elliott J, Patterson M, Vitry E, Summer N, Miternique C (2016) Morphological plasticity allows coral to actively overgrow the aggressive sponge Terpios hoshinota (Mauritius, southwestern). Mar Biodivers 46:489–493. doi:10.1007/s12526-015-0370-4

    Article  Google Scholar 

  3. Gilliam DS, Walker BK, Saelens SJ, Fahy DP, Kosmynin VN (2008) Recovery of injured giant barrel sponges, Xestospongia muta, offshore southeast Florida. Proc 11th Int Coral Reef Symp 2:1272–1275

  4. García-Hernández JE, van Moorsel GWNM, Hoeksema BW (2016) Lettuce corals overgrowing tube sponges at St. Eustatius, Dutch Caribbean. Mar Biodivers. doi:10.1007/s12526-016-0467-4

    Google Scholar 

  5. Hoeksema BW, Dekker F, de Voogd NJ (2014) Free-living mushroom corals strike back by overtopping a coral-killing sponge. Mar Biodivers 44:3–4. doi:10.1007/s12526-013-0188-x

    Article  Google Scholar 

  6. Lewis TB, Finelli CM (2014) Epizoic zoanthids reduce pumping in two Caribbean vase sponges. Coral Reefs 34:291–300. doi:10.1007/s00338-014-1226-2

    Article  Google Scholar 

  7. Loh TL, Pawlik JR (2014) Chemical defenses and resource trade-offs structure sponge communities on Caribbean coral reefs. Proc Natl Acad Sci U S A 111:4151–4156. doi:10.1073/pnas.1321626111

    CAS  Article  PubMed  PubMed Central  Google Scholar 

  8. McMurray SE, Blum JE, Pawlik JR (2008) Redwood of the reef: growth and age of the giant barrel sponge Xestospongia muta in the Florida Keys. Mar Biol 155:159–171. doi:10.1007/s00227-008-1014-z

    Article  Google Scholar 

  9. Stachowicz JJ (2001) Mutualism, facilitation, and the structure of ecological communities. Bioscience 51:235–246. doi:10.1641/0006-3568(2001)051[0235:MFATSO]2.0.CO;2

    Article  Google Scholar 

  10. Wulff JL (1985) Clonal organisms and the evolution of mutualism. In: Jackson JBC, Buss LW, Cook RE (eds) Population biology and evolution of clonal organisms. Yale University Press, New Haven, pp 437–466

    Google Scholar 

  11. Wulff JL (2006) Ecological interactions of marine sponges. Can J Zool 84:146–166. doi:10.1139/Z06-019

    Article  Google Scholar 

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We would like to thank Godfried WNM van Moorsel, Ernesto Weil, and Nikolaos Schizas for their guidance and suggestions during the early and late stages of this manuscript. We would also like to thank the two anonymous reviewers for their constructive and insightful comments. Lastly, we would like to thank Samson for getting us to this remote dive site.

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Correspondence to J. E. García-Hernández.

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Communicated by B. W. Hoeksema

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Hammerman, N.M., García-Hernández, J.E. The sponge Xestospongia muta offers shelter to the stony coral Madracis auretenra (Northwest Puerto Rico). Mar Biodiv 47, 57–58 (2017).

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  • Barrel sponge
  • Yellow pencil coral
  • Caribbean
  • Coral reefs
  • Symbiotic interaction