Down to the bone: the role of overlooked endolithic microbiomes in reef coral health.

Mathieu Pernice, Jean-Baptiste Raina, Nils Rädecker, Anny Cardenas, Claudia Pogoreutz, Christian R. Voolstra

Research output: Contribution to journalArticlepeer-review

90 Scopus citations


Reef-building corals harbour an astonishing diversity of microorganisms, including endosymbiotic microalgae, bacteria, archaea, and fungi. The metabolic interactions within this symbiotic consortium are fundamental to the ecological success of corals and the unique productivity of coral reef ecosystems. Over the last two decades, scientific efforts have been primarily channelled into dissecting the symbioses occurring in coral tissues. Although easily accessible, this compartment is only 2-3 mm thick, whereas the underlying calcium carbonate skeleton occupies the vast internal volume of corals. Far from being devoid of life, the skeleton harbours a wide array of algae, endolithic fungi, heterotrophic bacteria, and other boring eukaryotes, often forming distinct bands visible to the bare eye. Some of the critical functions of these endolithic microorganisms in coral health, such as nutrient cycling and metabolite transfer, which could enable the survival of corals during thermal stress, have long been demonstrated. In addition, some of these microorganisms can dissolve calcium carbonate, weakening the coral skeleton and therefore may play a major role in reef erosion. Yet, experimental data are wanting due to methodological limitations. Recent technological and conceptual advances now allow us to tease apart the complex physical, ecological, and chemical interactions at the heart of coral endolithic microbial communities. These new capabilities have resulted in an excellent body of research and provide an exciting outlook to further address the functional microbial ecology of the
Original languageEnglish (US)
Pages (from-to)325-334
Number of pages10
JournalThe ISME Journal
Issue number2
StatePublished - Nov 7 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors would like to thank Philippe Plateaux and Xavier Pita for their work on the figures, and Emmanuelle Botté for her assistance. Figure 1 was designed by JB Raina and produced by Philippe Plateaux. Figure 2 was designed by C Pogoreutzand produced by Xavier Pita, scientific illustrator at King Abdullah University of Science and Technology (KAUST). CRV and NR acknowledge funding from the KAUST CPF funding. This publication was supported by a KAUST Competitive Research Grants (CRG) toCRV, MP, and J-BR. J-BR was supported by an Australian ResearchCouncil fellowship (DE160100636).


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