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Quantifying the pH 'vital effect' in the temperate zooxanthellate coral Cladocora caespitosa: Validation of the boron seawater pH proxy

Trotter, Julie; Montagna, Paolo; McCulloch, Malcolm Thomas; Silenzi , Sergio; Reynaud, Stephanie; Mortimer, Graham; Martin, Sophie; Ferrier-Pagès, Christine; Gattuso, Jean-Pierre; Rodolfo-Metalpa, Riccardo

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Boron isotopic and elemental systematics are used to define the vital effects for the temperate shallow water Mediterranean coral Cladocora caespitosa. The corals are from a range of seawater pH conditions (pHT ~7.6 to ~8.1) and environmental settings: (1) naturally living colonies harvested from normal pH waters offshore Levanto, (2) colonies transplanted nearby a subsea volcanic vent system, and (3) corals cultured in aquaria exposed to high (700μatm) and near present day (400μatm) pCO2...[Show more]

dc.contributor.authorTrotter, Julie
dc.contributor.authorMontagna, Paolo
dc.contributor.authorMcCulloch, Malcolm Thomas
dc.contributor.authorSilenzi , Sergio
dc.contributor.authorReynaud, Stephanie
dc.contributor.authorMortimer, Graham
dc.contributor.authorMartin, Sophie
dc.contributor.authorFerrier-Pagès, Christine
dc.contributor.authorGattuso, Jean-Pierre
dc.contributor.authorRodolfo-Metalpa, Riccardo
dc.date.accessioned2015-12-10T23:23:23Z
dc.identifier.issn0012-821X
dc.identifier.urihttp://hdl.handle.net/1885/66937
dc.description.abstractBoron isotopic and elemental systematics are used to define the vital effects for the temperate shallow water Mediterranean coral Cladocora caespitosa. The corals are from a range of seawater pH conditions (pHT ~7.6 to ~8.1) and environmental settings: (1) naturally living colonies harvested from normal pH waters offshore Levanto, (2) colonies transplanted nearby a subsea volcanic vent system, and (3) corals cultured in aquaria exposed to high (700μatm) and near present day (400μatm) pCO2 levels. B/Ca compositions measured using laser ablation inductively coupled mass spectrometry (LA-ICPMS) show that boron uptake by C. caespitosa cultured at different pCO2 levels is independent of ambient seawater pH being mainly controlled by temperature-dependent calcification. In contrast, the boron isotope compositions (δ11Bcarb) of the full suite of corals determined by positive thermal ionisation mass spectrometry (PTIMS) shows a clear trend of decreasing δ11Bcarb (from 26.7 to 22.2‰) with decreasing seawater pH, reflecting the strong pH dependence of the boron isotope system. The δ11Bcarb compositions together with measurements of ambient seawater parameters enable calibration of the boron pH proxy for C. caespitosa, by using a new approach that defines the relationship between ambient seawater pH (pHsw) and the internally controlled pH at the site of calcification (pHbiol). C. caespitosa exhibits a linear relationship between pHsw and the shift in pH due to physiological processes (δpH=pHbiol-pHsw) giving the regression δpHClad=4.80-0.52×pHsw for this species. We further apply this method ("δpH-pHsw") to calibrate tropical species of Porites, Acropora, and Stylophora reported in the literature. The temperate and tropical species calibrations are all linearly correlated (r2>0.9) and the biological fractionation component (δpH) between species varies within ~0.2 pH units. Our "δpH-pHsw" approach provides a robust and accurate tool to reconstruct palaeoseawater pHsw for both temperate and tropical corals, further validating the boron fractionation factor (αB3-B4=1.0272) determined experimentally by Klochko et al. (2006) and the boron isotope pH proxy, both of which have been the foci of considerable debate.
dc.publisherElsevier
dc.sourceEarth and Planetary Science Letters
dc.subjectKeywords: Acropora; Biological fractionation; Boron isotopes; Cladocora caespitosa; Fractionation factors; Laser ablation inductively coupled mass spectrometries; Linear relationships; Mediterranean; New approaches; Ocean acidification; PCO2; pH condition; PH depen Boron; Cladocora caespitosa; Mediterranean; Ocean acidification; PCO2; Seawater pH
dc.titleQuantifying the pH 'vital effect' in the temperate zooxanthellate coral Cladocora caespitosa: Validation of the boron seawater pH proxy
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume303
dc.date.issued2011
local.identifier.absfor040104 - Climate Change Processes
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.ariespublicationf2965xPUB1371
local.type.statusPublished Version
local.contributor.affiliationTrotter, Julie, University of Western Australia
local.contributor.affiliationMontagna, Paolo, Columbia University
local.contributor.affiliationMcCulloch, Malcolm Thomas, University of Western Australia
local.contributor.affiliationSilenzi , Sergio, Institute for Environmental Protection and Research
local.contributor.affiliationReynaud, Stephanie, Centre Scientifique de Monaco
local.contributor.affiliationMortimer, Graham, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationMartin, Sophie, INSU-CNRS, Laboratoire d'Océanographie de Villefranche
local.contributor.affiliationFerrier-Pagès, Christine, Centre Scientifique de Monaco
local.contributor.affiliationGattuso, Jean-Pierre, INSU-CNRS, Laboratoire d'Océanographie de Villefranche
local.contributor.affiliationRodolfo-Metalpa, Riccardo, University of Plymouth
local.description.embargo2037-12-31
local.bibliographicCitation.issue3-4
local.bibliographicCitation.startpage163
local.bibliographicCitation.lastpage173
local.identifier.doi10.1016/j.epsl.2011.01.030
local.identifier.absseo960304 - Climate Variability (excl. Social Impacts)
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2016-02-24T08:13:11Z
local.identifier.scopusID2-s2.0-79952107830
local.identifier.thomsonID000288881900001
CollectionsANU Research Publications

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