Abstract
Both juvenile and adult life stages of the temperate scleractinian coral Oculina arbuscula are resilient to the effects of moderate ocean acidification (OA) in contrast to many tropical corals in which growth and calcification rates are suppressed. Here, potential mechanisms of resilience to OA related to photosynthetic physiology and inorganic carbon processing were studied in adult O. arbuscula colonies. After exposing colonies to ambient and elevated carbon dioxide (CO2) treatments for 7 weeks, photosynthetic performance was characterized using photosynthesis versus irradiance experiments, chlorophyll fluorescence kinetics, and algal pigment content. Inorganic carbon-processing capabilities were assessed by measurement of internal and external carbonic anhydrase activity of the coral host, internal carbonic anhydrase activity of symbiotic algae, and the reliance of photosynthesis on external carbonic anhydrase. Photosynthetic physiology was unaffected by OA ruling out the possibility that resilience was mediated by increased photosynthetic energy supply. Carbonic anhydrase activities were maintained at elevated CO2 suggesting no major rearrangements of the inorganic carbon-processing machinery, but this could be a sign of resilience since tropical corals often down-regulate carbonic anhydrases at high CO2. The general lack of effect of ocean acidification on these physiological traits suggests other characteristics, such as maintenance of calcifying fluid pH and ability to acquire energy from heterotrophy, may be more important for the resilience of O. arbuscula to OA.
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Acknowledgements
This work was supported by an Institutional Grant (NA18OAR4170084) to the Georgia Sea Grant College Program from the National Sea Grant Office, National Oceanic and Atmospheric Administration, US Department of Commerce. We are grateful to M. Head, T. Recicar, and K. Roberson at Gray’s Reef National Marine Sanctuary for providing logistical support for specimen collection. Oculina arbuscula were collected under the auspices of a letter of acknowledgement from the National Marine Fisheries Service, Southeast Regional Office, St. Petersburg, FL.
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Wang, C., Arneson, E.M., Gleason, D.F. et al. Resilience of the temperate coral Oculina arbuscula to ocean acidification extends to the physiological level. Coral Reefs 40, 201–214 (2021). https://doi.org/10.1007/s00338-020-02029-y
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DOI: https://doi.org/10.1007/s00338-020-02029-y