The influence of seawater calcium ions on coral calcification mechanisms: Constraints from boron and carbon isotopes and B/Ca ratios in Pocillopora damicornis
Earth and Planetary Science Letters, ISSN: 0012-821X, Vol: 519, Page: 130-140
2019
- 9Citations
- 34Captures
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Article Description
In order to better understand the response of coral calcification to changes in seawater chemistry, fragments of the coral Pocillopora damicornis were grown in seawater with varying [Ca 2+ ]. Using a combined trace element (B/Ca) and stable isotope ( δ11 B, δ13 C) approach, this paper explores the effect of seawater calcium concentrations ([Ca 2+ ] SW ) on coral calcification mechanisms and describes the manipulation of the extracellular calcifying fluid (ECF) pH (pH ECF ), saturation state ( Ω ECF ) and dissolved inorganic carbon (DIC) speciation of the ECF. In these experiments, increases in [Ca 2+ ] SW did not significantly influence calcification rates but caused the skeletal B/Ca ratio to significantly increase. To explain these results we propose a mechanism by which [CO 32− ] ECF is influenced by [Ca 2+ ] SW. This mechanism suggests that the pH ECF will be lowest in our highest [Ca 2+ ] treatment and using this relationship we can place constraints on the pH ECF. The difference in pH ECF in our treatments is supported in part by a slight, but insignificant decrease in skeletal δ11 B and δ13 C values. We propose a novel dual-proxy approach to estimate pH ECF, where calcification occurs at a pH ECF > 9. This work emphasizes the importance of multi-element proxy approaches in understanding pH up-regulation and CO 32− concentrations during calcification of corals.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0012821X19302699; http://dx.doi.org/10.1016/j.epsl.2019.05.008; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85065926772&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0012821X19302699; https://dx.doi.org/10.1016/j.epsl.2019.05.008
Elsevier BV
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