Corals exhibit distinct patterns of microbial reorganisation to thrive in an extreme inshore environment

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2020
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Camp, Emma F.
Suggett, David J.
Nitschke, Matthew R.
Houlbreque, Fanny
Gardner, Stephanie G.
Zampighi, Marco
Rodolfo-Metalpa, Riccardo
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Coral Reefs. Springer. 2020, 39(3), pp. 701-716. ISSN 0722-4028. eISSN 1432-0975. Available under: doi: 10.1007/s00338-019-01889-3
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Climate change threatens the survival of scleractinian coral from exposure to concurrent ocean warming, acidification and deoxygenation; how corals can potentially adapt to this trio of stressors is currently unknown. This study investigates three coral species (Acropora muricata, Acropora pulchra and Porites lutea) dominant in an extreme mangrove lagoon (Bouraké, New Caledonia) where abiotic conditions exceed those predicted for many reef sites over the next 100 years under climate change and compared them to conspecifics from an environmentally more benign reef habitat. We studied holobiont physiology as well as plasticity in coral-associated microorganisms (Symbiodiniaceae and bacteria) through ITS2 and 16S rRNA sequencing, respectively. We hypothesised that differences in coral-associated microorganisms (Symbiodiniaceae and bacteria) between the lagoonal and adjacent reef habitats may support coral host productivity and ultimately the ability of corals to live in extreme environments. In the lagoon, all coral species exhibited a metabolic adjustment of reduced photosynthesis-to-respiration ratios (P/R), but this was accompanied by highly divergent coral host-specific microbial associations. This was substantiated by the absence of shared ITS2-type profiles (proxies for Symbiodiniaceae genotypes). We observed that ITS2 profiles originating from Durusdinium taxa made up < 3% and a novel Symbiodinium ITS2 profile A1-A1v associated with A. pulchra. Bacterial community profiles were also highly divergent in corals from the lagoonal environment, whereas corals from the reef site were consistently dominated by Hahellaceae, Endozoicomonas. As such, differences in host–microorganism associations aligned with different physiologies and habitats. Our results argue that a multitude of host–microorganism associations are required to fulfill the changing nutritional demands of corals persisting into environments that parallel climate change scenarios.

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ISO 690CAMP, Emma F., David J. SUGGETT, Claudia POGOREUTZ, Matthew R. NITSCHKE, Fanny HOULBREQUE, Benjamin C. C. HUME, Stephanie G. GARDNER, Marco ZAMPIGHI, Riccardo RODOLFO-METALPA, Christian R. VOOLSTRA, 2020. Corals exhibit distinct patterns of microbial reorganisation to thrive in an extreme inshore environment. In: Coral Reefs. Springer. 2020, 39(3), pp. 701-716. ISSN 0722-4028. eISSN 1432-0975. Available under: doi: 10.1007/s00338-019-01889-3
BibTex
@article{Camp2020-06Coral-48559,
  year={2020},
  doi={10.1007/s00338-019-01889-3},
  title={Corals exhibit distinct patterns of microbial reorganisation to thrive in an extreme inshore environment},
  number={3},
  volume={39},
  issn={0722-4028},
  journal={Coral Reefs},
  pages={701--716},
  author={Camp, Emma F. and Suggett, David J. and Pogoreutz, Claudia and Nitschke, Matthew R. and Houlbreque, Fanny and Hume, Benjamin C. C. and Gardner, Stephanie G. and Zampighi, Marco and Rodolfo-Metalpa, Riccardo and Voolstra, Christian R.}
}
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