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Oecologia

, Volume 159, Issue 2, pp 325–336 | Cite as

Survival and settlement success of coral planulae: independent and synergistic effects of macroalgae and microbes

  • M. J. A. Vermeij
  • J. E. Smith
  • C. M. Smith
  • R. Vega Thurber
  • S. A. Sandin
Plant-Animal Interactions - Original Paper

Abstract

Restoration of degraded coral reef communities is dependent on successful recruitment and survival of new coral planulae. Degraded reefs are often characterized by high cover of fleshy algae and high microbial densities, complemented by low abundance of coral and coral recruits. Here, we investigated how the presence and abundance of macroalgae and microbes affected recruitment success of a common Hawaiian coral. We found that the presence of algae reduced survivorship and settlement success of planulae. With the addition of the broad-spectrum antibiotic, ampicillin, these negative effects were reversed, suggesting that algae indirectly cause planular mortality by enhancing microbial concentrations or by weakening the coral’s resistance to microbial infections. Algae further reduced recruitment success of corals as planulae preferentially settled on algal surfaces, but later suffered 100% mortality. In contrast to survival, settlement was unsuccessful in treatments containing antibiotics, suggesting that benthic microbes may be necessary to induce settlement. These experiments highlight potential complex interactions that govern the relationships between microbes, algae and corals and emphasize the importance of microbial dynamics in coral reef ecology and restoration.

Keywords

Recruitment Coral–algal interactions Microbes Allelopathy DOC Post-settlement survival Hawai’i Montipora Reef degradation 

Notes

Acknowledgments

We thank Heather Spalding, Meghan Dailer and Christine Huffard for help with the collections of gametes during the coral spawning. Dave Gulko and the Hawai’i Department of Aquatic Resources (DAR) assisted with permitting procedures. We thank F.L. Rohwer for intellectual support and comments. This research was supported by a grant to CMS, no. NA03NOS4780020, from the Center for Sponsored Coastal Ocean Research, National Ocean Service, NOAA. This ECOHAB publication #294.

Supplementary material

442_2008_1223_MOESM1_ESM.doc (150 kb)
Statistical appendix for: Microbial impacts on survival and settlement of coral planulae. (DOC 150 kb)

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • M. J. A. Vermeij
    • 1
    • 5
  • J. E. Smith
    • 2
  • C. M. Smith
    • 1
  • R. Vega Thurber
    • 3
  • S. A. Sandin
    • 4
  1. 1.Department of BotanyUniversity of Hawai’i at ManoaHonoluluUSA
  2. 2.National Center for Ecological Analysis and SynthesisUniversity of CaliforniaSanta BarbaraUSA
  3. 3.Biology DepartmentSan Diego State UniversitySan DiegoUSA
  4. 4.Center for Marine Biodiversity and ConservationScripps Institution of OceanographyLa JollaUSA
  5. 5.CarmabiCuraçaoNetherlands Antilles

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