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Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification.
Sci Rep. 2017 08 08; 7(1):7573.SR

Abstract

Evaluating the factors responsible for differing species-specific sensitivities to declining seawater pH is central to understanding the mechanisms via which ocean acidification (OA) affects coral calcification. We report here the results of an experiment comparing the responses of the coral Acropora yongei and Pocillopora damicornis to differing pH levels (8.09, 7.81, and 7.63) over an 8-week period. Calcification of A. youngei was reduced by 35% at pH 7.63, while calcification of P. damicornis was unaffected. The pH in the calcifying fluid (pHcf) was determined using δ11B systematics, and for both species pHcf declined slightly with seawater pH, with the decrease being more pronounced in P. damicornis. The dissolved inorganic carbon concentration at the site of calcification (DICcf) was estimated using geochemical proxies (B/Ca and δ11B) and found to be double that of seawater DIC, and increased in both species as seawater pH decreased. As a consequence, the decline of the saturation state at the site of calcification (Ωcf) with OA was partially moderated by the DICcf increase. These results highlight that while pHcf, DICcf and Ωcf are important in the mineralization process, some corals are able to maintain their calcification rates despite shifts in their calcifying fluid carbonate chemistry.

Authors+Show Affiliations

The University of Western Australia, School of Earth Sciences and Oceans Institute, Crawley, Western Australia, 6009, Australia. steeve.comeau@uwa.edu.au. ARC Centre of Excellence for Coral Reef Studies, Crawley, Western Australia, 6009, Australia. steeve.comeau@uwa.edu.au.The University of Western Australia, School of Earth Sciences and Oceans Institute, Crawley, Western Australia, 6009, Australia. ARC Centre of Excellence for Coral Reef Studies, Crawley, Western Australia, 6009, Australia.The University of Western Australia, School of Earth Sciences and Oceans Institute, Crawley, Western Australia, 6009, Australia. ARC Centre of Excellence for Coral Reef Studies, Crawley, Western Australia, 6009, Australia.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

28790423

Citation

Comeau, S, et al. "Decoupling Between the Response of Coral Calcifying Fluid pH and Calcification to Ocean Acidification." Scientific Reports, vol. 7, no. 1, 2017, p. 7573.
Comeau S, Cornwall CE, McCulloch MT. Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification. Sci Rep. 2017;7(1):7573.
Comeau, S., Cornwall, C. E., & McCulloch, M. T. (2017). Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification. Scientific Reports, 7(1), 7573. https://doi.org/10.1038/s41598-017-08003-z
Comeau S, Cornwall CE, McCulloch MT. Decoupling Between the Response of Coral Calcifying Fluid pH and Calcification to Ocean Acidification. Sci Rep. 2017 08 8;7(1):7573. PubMed PMID: 28790423.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification. AU - Comeau,S, AU - Cornwall,C E, AU - McCulloch,M T, Y1 - 2017/08/08/ PY - 2016/12/15/received PY - 2017/07/07/accepted PY - 2017/8/10/entrez PY - 2017/8/10/pubmed PY - 2019/3/12/medline SP - 7573 EP - 7573 JF - Scientific reports JO - Sci Rep VL - 7 IS - 1 N2 - Evaluating the factors responsible for differing species-specific sensitivities to declining seawater pH is central to understanding the mechanisms via which ocean acidification (OA) affects coral calcification. We report here the results of an experiment comparing the responses of the coral Acropora yongei and Pocillopora damicornis to differing pH levels (8.09, 7.81, and 7.63) over an 8-week period. Calcification of A. youngei was reduced by 35% at pH 7.63, while calcification of P. damicornis was unaffected. The pH in the calcifying fluid (pHcf) was determined using δ11B systematics, and for both species pHcf declined slightly with seawater pH, with the decrease being more pronounced in P. damicornis. The dissolved inorganic carbon concentration at the site of calcification (DICcf) was estimated using geochemical proxies (B/Ca and δ11B) and found to be double that of seawater DIC, and increased in both species as seawater pH decreased. As a consequence, the decline of the saturation state at the site of calcification (Ωcf) with OA was partially moderated by the DICcf increase. These results highlight that while pHcf, DICcf and Ωcf are important in the mineralization process, some corals are able to maintain their calcification rates despite shifts in their calcifying fluid carbonate chemistry. SN - 2045-2322 UR - https://www.unboundmedicine.com/medline/citation/28790423/Decoupling_between_the_response_of_coral_calcifying_fluid_pH_and_calcification_to_ocean_acidification_ L2 - http://dx.doi.org/10.1038/s41598-017-08003-z DB - PRIME DP - Unbound Medicine ER -