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Sedimentation rapidly induces an immune response and depletes energy stores in a hard coral

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Abstract

High sedimentation rates have been linked to reduced coral health within multiple systems; however, whether this is a direct result of compromised coral immunity has not been previously investigated. The potential effects of sedimentation on immunity of the hard coral Montipora patula were examined by comparing physiological responses of coral fragments inoculated with sterilized marine sediments and those under control conditions. Sediments were collected from terrestrial runoff-affected reefs in SW Madagascar and applied cyclically for a total of 24 h at a rate observed during precipitation-induced sedimentation events. Coral health was determined 24 h after the onset of the sedimentation stress through measuring metabolic proxies of O2 budget and lipid ratios. Immune response of the melanin synthesis pathway was measured by quantifying phenoloxidase activity and melanin deposits. Sedimentation induced both immune and metabolic responses in M. patula. Both phenoloxidase activity and melanin deposition were significantly higher in the sediment treatment compared to controls, indicating an induced immune response. Sediment-treated corals also showed a tendency towards increased respiration (during the night) and decreased photosynthesis (during the day) and a significant depletion of energy reserves as compared to controls. These data highlight that short-term (24 h) sedimentation, free of live microorganisms, compromises the health of M. patula. The energetically costly immune response, potentially elicited by residual endotoxins and other inflammatory particles associated with the sterile sediments, likely contributes to the energy depletion. Overall, exposure to sedimentation adversely affects coral health and continued exposure may lead to resource depletion and an increased susceptibility to disease.

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Acknowledgments

Funding for this project was obtained from the National Fund for Scientific Research (FNRS F3/5/5-A2/5-MCF/DM-A115), Leopold III Funds, and the Agence Francophone pour l’Education (AEF). We would like to thank Antoigne Patiny for his help with the design and preparation of the inoculation experiment, Maryse Vanderplank and Georges Lognay for their help with lipid extraction procedures, and JM Baele for his help with sediment analyses. This study is a contribution of the Centre Interuniversitaire de Biologie Marine and the Polyaquaculture Research Unit. We would also like to thank the editors and two anonymous reviewers for their useful comments.

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Correspondence to C. Sheridan.

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Sheridan, C., Grosjean, P., Leblud, J. et al. Sedimentation rapidly induces an immune response and depletes energy stores in a hard coral. Coral Reefs 33, 1067–1076 (2014). https://doi.org/10.1007/s00338-014-1202-x

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