Greater functional diversity and redundancy of coral endolithic microbiomes align with lower coral bleaching susceptibility

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2022
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Raina, Jean-Baptiste
Bougoure, Jeremy
Guagliardo, Paul
Pernice, Mathieu
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The skeleton of reef-building coral harbors diverse microbial communities that could compensate for metabolic deficiencies caused by the loss of algal endosymbionts, i.e., coral bleaching. However, it is unknown to what extent endolith taxonomic diversity and functional potential might contribute to thermal resilience. Here we exposed Goniastrea edwardsi and Porites lutea, two common reef-building corals from the central Red Sea to a 17-day long heat stress. Using hyperspectral imaging, marker gene/metagenomic sequencing, and NanoSIMS, we characterized their endolithic microbiomes together with 15N and 13C assimilation of two skeletal compartments: the endolithic band directly below the coral tissue and the deep skeleton. The bleaching-resistant G. edwardsi was associated with endolithic microbiomes of greater functional diversity and redundancy that exhibited lower N and C assimilation than endoliths in the bleaching-sensitive P. lutea. We propose that the lower endolithic primary productivity in G. edwardsi can be attributed to the dominance of chemolithotrophs. Lower primary production within the skeleton may prevent unbalanced nutrient fluxes to coral tissues under heat stress, thereby preserving nutrient-limiting conditions characteristic of a stable coral-algal symbiosis. Our findings link coral endolithic microbiome structure and function to bleaching susceptibility, providing new avenues for understanding and eventually mitigating reef loss.

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ISO 690CÁRDENAS, Anny, Jean-Baptiste RAINA, Claudia POGOREUTZ, Nils RÄDECKER, Jeremy BOUGOURE, Paul GUAGLIARDO, Mathieu PERNICE, Christian R. VOOLSTRA, 2022. Greater functional diversity and redundancy of coral endolithic microbiomes align with lower coral bleaching susceptibility. In: The ISME journal. Nature Publishing Group. 2022, 16(10), pp. 2406-2420. ISSN 1751-7362. eISSN 1751-7370. Available under: doi: 10.1038/s41396-022-01283-y
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@article{Cardenas2022-10Great-58064,
  year={2022},
  doi={10.1038/s41396-022-01283-y},
  title={Greater functional diversity and redundancy of coral endolithic microbiomes align with lower coral bleaching susceptibility},
  number={10},
  volume={16},
  issn={1751-7362},
  journal={The ISME journal},
  pages={2406--2420},
  author={Cárdenas, Anny and Raina, Jean-Baptiste and Pogoreutz, Claudia and Rädecker, Nils and Bougoure, Jeremy and Guagliardo, Paul and Pernice, Mathieu and Voolstra, Christian R.}
}
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