The influence of seawater pH on U / Ca ratios in the scleractinian cold-water coral &amp;lt;i&amp;gt;Lophelia pertusa&amp;lt;/i&amp;gt;

Raddatz, Jacek; Rüggeberg, Andres; Flögel, Sascha; Hathorne, Ed C; Liebetrau, Volker; Eisenhauer, Anton; Dullo, Wolf‐Christian

doi:10.5194/bg-11-1863-2014

Cited by 37 publications

(27 citation statements)

References 65 publications

(114 reference statements)

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“…This is not entirely unexpected as U/Ca in zooxanthellate and azooxanthellate corals have been shown to be influenced by pH (Inoue et al, 2011;Raddatz et al, 2014). Our results partially support this conclusion that the larger change in pCO 2 decrease (increasing OA, decreasing pH) and associated [CO 2− 3 ] induces the only significant impact on U/Ca ratio [ANOVA, F (1, 68) = 8.730, p = 0.005; Table 6].…”

Section: Relationship Of Primary Polyp a Millepora Skeletal B/ca Andsupporting

confidence: 79%

Primary Life Stage Boron Isotope and Trace Elements Incorporation in Aposymbiotic Acropora millepora Coral under Ocean Acidification and Warming

Dissard

Cornec

et al. 2017

Front. Mar. Sci.

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Early-life stages of reef-building corals are vital to coral existence and reef maintenance. It is therefore crucial to study juvenile coral response to future climate change pressures. Moreover, corals are known to be reliable recorders of environmental conditions in their skeletal materials. Aposymbiotic Acropora millepora larvae were cultured in different seawater temperature (27 and 29 • C) and pCO 2 (390 and 750 µatm) conditions to understand the impacts of "end of century" ocean acidification (OA) and ocean warming (OW) conditions on skeletal morphology and geochemistry. The experimental conditions impacted primary polyp juvenile coral skeletal morphology and growth resulting in asymmetric translucent appearances with brittle skeleton features. The impact of OA resulted in microstructure differences with decreased precipitation or lengthening of fasciculi and disorganized aragonite crystals that led to more concentrations of centers of calcifications. The coral skeletal δ 11 B composition measured by laser ablation MC-ICP-MS was significantly affected by pCO 2 (p = 0.0024) and water temperature (p = 1.46 × 10 −5 ). Reconstructed pH of the primary polyp skeleton using the δ 11 B proxy suggests a difference in coral calcification site and seawater pH consistent with previously observed coral pH up-regulation. Similarly, trace element results measured by laser ablation ICP-MS indicate the impact of pCO 2 . Primary polyp juvenile Sr/Ca ratio indicates a bias in reconstructed sea surface temperature (SST) under higher pCO 2 conditions. Coral microstructure content changes (center of calcification and fasciculi) due to OA possibly contributed to the variability in B/Ca ratios. Our results imply that increasing OA and OW may lead to coral acclimation issues and species-specific inaccuracies of the commonly used Sr/Ca-SST proxy.

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Section: Relationship Of Primary Polyp a Millepora Skeletal B/ca Andsupporting

confidence: 79%

Primary Life Stage Boron Isotope and Trace Elements Incorporation in Aposymbiotic Acropora millepora Coral under Ocean Acidification and Warming

Dissard

Cornec

et al. 2017

Front. Mar. Sci.

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“…For temperature and pH, different geochemical proxies can be used to calculate these parameters in the geological past. Sr/Ca and Li/Mg ratios serve as temperature proxies (Cohen et al, 2006;Gagnon et al, 2007;Mitsuguchi et al, 1996;Montagna et al, 2014;Raddatz et al, 2013Raddatz et al, , 2014bRollion-Bard and Blamart, 2015;Shirai et al, 2005), U/Ca and boron isotopes serve as proxies of the carbonate system (Anagnostou et al, 2011(Anagnostou et al, , 2012Blamart et al, 2007;McCulloch et al, 2012;Raddatz et al, 2014aRaddatz et al, , 2016Rollion-Bard et al, 2011). However, independent geochemical methods to reconstruct past salinities are absent but urgently needed to reconstruct spatial distribution patterns in the past and quantify the effects of ocean acidification on CWCs by researching its effects in the past.…”

Section: Introductionmentioning

confidence: 99%

Environmental and biological controls on Na∕Ca ratios in scleractinian cold-water corals

et al. 2019

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Abstract. Here we present a comprehensive attempt to correlate aragonitic Na∕Ca ratios from Desmophyllum pertusum (formerly known as Lophelia pertusa), Madrepora oculata and a caryophylliid cold-water coral (CWC) species with different seawater parameters such as temperature, salinity and pH. Living CWC specimens were collected from 16 different locations and analyzed for their Na∕Ca ratios using solution-based inductively coupled plasma-optical emission spectrometry (ICP-OES) measurements. The results reveal no apparent correlation with salinity (30.1–40.57 g kg−1) but a significant inverse correlation with temperature (-0.31±0.04 mmolmol-1∘C-1). Other marine aragonitic organisms such as Mytilus edulis (inner aragonitic shell portion) and Porites sp. exhibit similar results highlighting the consistency of the calculated CWC regressions. Corresponding Na∕Mg ratios show a similar temperature sensitivity to Na∕Ca ratios, but the combination of two ratios appears to reduce the impact of vital effects and domain-dependent geochemical variation. The high degree of scatter and elemental heterogeneities between the different skeletal features in both Na∕Ca and Na∕Mg, however, limit the use of these ratios as a proxy and/or make a high number of samples necessary. Additionally, we explore two models to explain the observed temperature sensitivity of Na∕Ca ratios for an open and semi-enclosed calcifying space based on temperature-sensitive Na- and Ca-pumping enzymes and transport proteins that change the composition of the calcifying fluid and consequently the skeletal Na∕Ca ratio.

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“…Response: This is true. U/Ca measurements on the other hand indicate an elevation at the COC (Raddatz et al, 2014;Sinclair et al, 2006). We added a clarification (L314) that the pH-elevation at COC is not finally resolved and also pH decreases are possible.…”

Section: Interactive Commentmentioning

confidence: 99%

Answer to Review 1

Schleinkofer¹

2019

Preprint

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Thank you for pointing that out. In deed it does not add much valuable information. We deleted this part except for the section about density control on the spatial distribution because it is closely related to salinities. Reviewer 1: L142: Specify here that the study of Branson et al (2015) is on foraminifera Response: L139: We added a clarification Reviewer 1: L151: How this "0.18 mmol/mol" is calculated? Or is it measured? Response: L147 Thank you for that comment, we agree a clarification was needed. This is calculated by using the profiled samples were the COC is recognizable. This value is just the difference between the means of the samples including COC measurements and the means of the samples not including the COC measurements. Reviewer 1: L172: Why the measured Sr/Ca ratio is clearly higher than the admitted ratio? Response: There could be many explanations for this error. One could be heterogeneities in the JcP-1 standard powder (Runnalls and Coleman, 2003). However, these deviations are accounted for and corrected during processing of the data. Reviewer 1: L174: Why do you mean by "accuracy amounts"? How was it calculated? Response: It is the deviation between the measured JCp-1 values and the true values in percent. We thought it is a convenient way to show the quality of measurements. We removed it nonetheless to avoid confusion. Reviewer 1: L189: Please define 'COC-like' Response: L185: We added a definition in the manuscript "In the COC and COC-like structures (structures that geochemically correspond to COC but morphologically to fibrous deposits)" Reviewer 1: L190: Is there any relation between the increase and the species? C2 BGD Interactive comment Printer-friendly version Discussion paper Response: We thank the reviewer for this very interesting comment, which should be targeted in future studies. However, here we cannot comment on this because the profiled samples all derive from Lophelia pertusa. However, it seems unlikely that great differences between different species exist given that the main controlling factor appears to be the increased growth rate in the COC's which most likely similar in different species. The main reason for the different increase in this study is probably sample mixing between COC material and fibrous material with different percentages.

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The influence of seawater pH on U / Ca ratios in the scleractinian cold-water coral <i>Lophelia pertusa</i>

Cited by 37 publications

References 65 publications

Primary Life Stage Boron Isotope and Trace Elements Incorporation in Aposymbiotic Acropora millepora Coral under Ocean Acidification and Warming

Primary Life Stage Boron Isotope and Trace Elements Incorporation in Aposymbiotic Acropora millepora Coral under Ocean Acidification and Warming

Environmental and biological controls on Na∕Ca ratios in scleractinian cold-water corals

Answer to Review 1

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