Abstract
Cold-water corals (CWCs) are thought to be particularly vulnerable to ocean acidification (OA) due to increased atmospheric pCO2, because they inhabit deep and cold waters where the aragonite saturation state is naturally low. Several recent studies have evaluated the impact of OA on organism-level physiological processes such as calcification and respiration. However, no studies to date have looked at the impact at the molecular level of gene expression. Here, we report results of a long-term, 8-month experiment to compare the physiological responses of the CWC Desmophyllum dianthus to OA at both the organismal and gene expression levels under two pCO2/pH treatments: ambient pCO2 (460 μatm, pHT = 8.01) and elevated pCO2 (997 μatm, pHT = 7.70). At the organismal level, no significant differences were detected in the calcification and respiration rates of D. dianthus. Conversely, significant differences were recorded in gene expression profiles, which showed an up-regulation of genes involved in cellular stress (HSP70) and immune defence (mannose-binding c-type lectin). Expression of alpha-carbonic anhydrase, a key enzyme involved in the synthesis of coral skeleton, was also significantly up-regulated in corals under elevated pCO2, indicating that D. dianthus was under physiological reconditioning to calcify under these conditions. Thus, gene expression profiles revealed physiological impacts that were not evident at the organismal level. Consequently, understanding the molecular mechanisms behind the physiological processes involved in a coral’s response to elevated pCO2 is critical to assess the ability of CWCs to acclimate or adapt to future OA conditions.
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Acknowledgments
We thank Emmanuelle Maitre, Andreia Braga-Henriques, and Luis Pires for assistance in aquaria maintenance. IMAR-DOP/UAz is a Research and Development Unit no. 531 and LARSyS-Associated Laboratory no.9 funded by the Portuguese Foundation for Science and Technology (FCT) through FCT project Pest/OE/EEI/LA0009/2011-2014 & COMPETE/QREN and by the Azores Fund for Science and Technology (FRCT). This study was supported by the European Community’s Seventh Framework Programme (FP7/2007–2013) through a Marie-Curie IRG Fellowship to MC-S (CoralChange, project no. 231109) and project HERMIONE (grant agreement no. 226354). Coral specimens used in this study were obtained by the observer onboard programme financed by CoralFISH project (grant agreement no. 213144). MC-S was supported by an FCT post-doctoral grant (SFRH/BPD/34634/2007). TC was supported by the doctoral grant from the Regional Directorate for Science, Technology and Communications (DRCTC), Regional Government of the Azores (M3.1.2/F/052/2011). RB was supported by FCT′s “Ciência 2007” (OE/COMPETE) recruitment programme.
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Carreiro-Silva, M., Cerqueira, T., Godinho, A. et al. Molecular mechanisms underlying the physiological responses of the cold-water coral Desmophyllum dianthus to ocean acidification. Coral Reefs 33, 465–476 (2014). https://doi.org/10.1007/s00338-014-1129-2
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DOI: https://doi.org/10.1007/s00338-014-1129-2