Ba/Ca of stylasterid coral skeletons records dissolved seawater barium concentrations

Kershaw, James; Stewart, Joseph; Strawson, Ivo; Ferreira, Maria Luiza de Carvalho; Robinson, Laura F.; Hendry, Katharine R; Samperiz, Ana; Burke, Andrea; Rae, J. W. B.; Day, Rusty D.; Etnoyer, Peter J.; Williams, B.; Häussermann, Vreni

doi:10.1016/j.chemgeo.2023.121355

Cited by 7 publications

(6 citation statements)

References 80 publications

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“…The mean (± 1 SD) elemental and isotopic compositions of the area of D. dianthus DY081-914DD imaged are as follows: Li/Ca = 10.68 ± 2.70 µmol/mol, B/Ca = 706.28 ± 79.74 µmol/mol, Mg/Ca = 2.40 ± 0.49 mmol/mol, Sr/Ca = 10.27 ± 0.40 mmol/mol, Ba/Ca = 9.05 ± 0.68 µmol/mol, U/Ca = 1715.63 ± 497.63 nmol/mol, Li/Mg = 4.40 ± 0.47 mmol/mol, δ 11 B = 25.80 ± 1.71 ‰ (Supplementary Table S3 ). These values are consistent with bulk samples of skeleton from the same coral analysed by solution ICP-MS both here and elsewhere 41 , 42 (Supplementary Table S2 , Supplementary Fig. S1 ); mean LA values are within 11% of bulk samples for all geochemical parameters.…”

Section: Resultssupporting

confidence: 86%

“…We compare our high spatial resolution dataset to geochemical analyses of the bulk DY081-914DD carbonate skeleton. Many of these results have been published previously including Li/Ca, Mg/Ca, Ba/Ca, and Sr/Ca ratios 41 , 42 . Additional bulk Fe/Ca and Mn/Ca values recorded in this specimen suggest that the cut samples were are largely free from Fe-Mn coating contamination (both < 0.15 µmol/mol 42 ).…”

Section: Methodsmentioning

confidence: 73%

“…Many of these results have been published previously including Li/Ca, Mg/Ca, Ba/Ca, and Sr/Ca ratios 41 , 42 . Additional bulk Fe/Ca and Mn/Ca values recorded in this specimen suggest that the cut samples were are largely free from Fe-Mn coating contamination (both < 0.15 µmol/mol 42 ). To supplement this, we present measurements of bulk B/Ca, U/Ca, and δ 11 B performed on the same sample replicates (oxidatively cleaned) used in Stewart et al 41 .…”

Section: Methodsmentioning

confidence: 73%

“…

Figure 1 D. dianthus DY081-914DD: ( a ) removal of septa from specimen for both bulk solution geochemistry (Stewart et al . 41 ; Kershaw et al 42 ; this study) and CMI; ( b ) optical image of the surface area of DY081-914DD where CMI was performed (approximated by dashed box). The primary COC is visible running vertically down the centre of the optical image as a white band, surrounded by dark fibrous aragonite on each side.…”

Section: Introductionmentioning

confidence: 94%

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Correlative geochemical imaging of Desmophyllum dianthus reveals biomineralisation strategy as a key coral vital effect

Standish,

Trend,

Kleboe

et al. 2024

Sci Rep

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The chemical and isotopic composition of stony coral skeletons form an important archive of past climate. However, these reconstructions are largely based on empirical relationships often complicated by “vital effects” arising from uncertain physiological processes of the coral holobiont. The skeletons of deep-sea corals, such as Desmophyllum dianthus, are characterised by micron-scale or larger geochemical heterogeneity associated with: (1) centres of calcification (COCs) where nucleation of new skeleton begins, and (2) fibres that thicken the skeleton. These features are difficult to sample cleanly using traditional techniques, resulting in uncertainty surrounding both the causes of geochemical differences and their influence on environmental signals. Here we combine optical, and in-situ chemical and isotopic, imaging tools across a range of spatial resolutions (~ 100 nm to 10 s of μm) in a correlative multimodal imaging (CMI) approach to isolate the microstructural geochemistry of each component. This reveals COCs are characterised by higher organic content, Mg, Li and Sr and lower U, B and δ11B compared to fibres, reflecting the contrasting biomineralisation mechanisms employed to construct each feature. CMI is rarely applied in Environmental/Earth Sciences, but here we illustrate the power of this approach to unpick the “vital effects” in D. dianthus, and by extension, other scleractinian corals.

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Section: Resultssupporting

confidence: 86%

Section: Methodsmentioning

confidence: 73%

Section: Methodsmentioning

confidence: 73%

“…

Section: Introductionmentioning

confidence: 94%

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Correlative geochemical imaging of Desmophyllum dianthus reveals biomineralisation strategy as a key coral vital effect

Standish,

Trend,

Kleboe

et al. 2024

Sci Rep

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“…The Ba/Ca ratio in corals grown in a reef unaffected by large rivers has been used to identify indications of upwelling, which transports both dissolved seawater and marine biological barium (Alibert and Kinsley, 2008;Spreter et al, 2022). Recently, it has been used to predict the concentrations of dissolved barium in seawater (Kershaw et al, 2023) and the growth rate of aragonite (Mavromatis et al, 2018). Furthermore, there is a report Indicating that light conditions affect the Ba/Ca in coral skeletons (Yamazaki et al, 2021).…”

Section: Ba/ca Variationmentioning

confidence: 99%

Assessment of chemical compositions in coral skeletons (Acropora digitifera and Porites australiensis) as temperature proxies

Sakata,

Inoue,

Tanaka

et al. 2024

Front. Mar. Sci.

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Although biogenic carbonates, such as foraminifera and coccolithophorids, are valuable tools for reconstructing past environments, scleractinian corals also offer environmental data from tropical to subtropical regions with a higher time resolution. For example, oxygen isotopes (δ18O) and strontium-calcium (Sr/Ca) ratios have been utilized to reconstruct sea surface temperatures and salinity, primarily through the use of massive-type Porites sp. from the Pacific, as well as corals like Diploria and Montastrea from the Atlantic. While a few types of corals other than Porites have been utilized in paleoclimate studies, comprehensive evaluations of their geochemical tracers as temperature proxies have not been thoroughly conducted. Therefore, in this study, we focused on branching-type Acropora, which are found worldwide and are often present in fossil corals. We conducted a comparison of the chemical compositions (δ18O, δ13C, Sr/Ca, U/Ca, Mg/Ca, and Ba/Ca) of Acropora digitifera and Porites australiensis through temperature-controlled culture experiments. The validity of using the chemical components of A. digitifera as temperature proxies was then evaluated. Three colonies of A. digitifera and P. australiensis were collected for culture experiments on Sesoko Island, Okinawa, Japan. We reared coral samples in seawater with five different temperature settings (18, 21, 24, 27, 30°). The calcification rate and photosynthesis efficiency (Fv/Fm) of each nubbin were measured during the experimental period. After the culture experiment for 77 days, chemical components in skeletal parts grown during the experiment were then measured. Consequently, the mean growth rates and Fv/Fm throughout the experiment were higher for A. digitifera (0.22%/d and 0.63 for growth rate and Fv/Fm) compared to those for P. australiensis (0.11%/d and 0.38 for growth rate and Fv/Fm). This suggests that the higher efficiency of photosynthesis in A. digitifera would promote greater calcification compared to P. australiensis. Regarding the potential use as temperature proxies, A. digitifera exhibited a strong negative correlation, on average, between δ18O and the water temperature (r = 0.95, p< 0.001). The temperature dependency was found to be comparable to that reported in Porites corals (-0.11 and -0.17 ‰/°C for P. australiensis and A. digitifera, respectively). Thus, the δ18O of A. digitifera appeared to be a useful temperature proxy, although it was also slightly influenced by skeletal growth rate at the same temperature. A strong negative correlation was also observed between the mean Sr/Ca ratio and temperature in A. digitifera (r = 0.61, p< 0.001) as well as P. australiensis (r = 0.56, p< 0.001), without a clear influence from the skeletal growth rate. Therefore, the skeletal Sr/Ca ratio in corals may have been primarily influenced by water temperature, although large deviations in Sr/Ca were observed in A. digitifera, even at the same temperature settings. This deviation can be reduced by subsampling an apical part of a polyp including the axis of skeletal growth. The U/Ca ratio of A. digitifera appeared to be affected by internal pH variation within the corals, especially at 30°C. Similar to U/Ca ratios, metabolic and kinetic effects on corals were observed in δ13C of A. digitifera at 18 and 30°C. In addition, considering the variation pattern of both U/Ca and δ13C of A. digitifera at 30°C, it has been suggested that respirations may overwhelm photosynthesis for coral samples at 30°C. Therefore, the U/Ca and δ13C of A. digitifera could potentially be used as proxies of biomineralization processes, whereas the δ18O and Sr/Ca displayed a high possibility of acting as temperature proxies.

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Tools to trace past productivity and ocean nutrients

Farmer,

Fehrenbacher,

Horner

et al. 2025

Treatise on Geochemistry

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Ba/Ca of stylasterid coral skeletons records dissolved seawater barium concentrations

Cited by 7 publications

References 80 publications

Correlative geochemical imaging of Desmophyllum dianthus reveals biomineralisation strategy as a key coral vital effect

Correlative geochemical imaging of Desmophyllum dianthus reveals biomineralisation strategy as a key coral vital effect

Assessment of chemical compositions in coral skeletons (Acropora digitifera and Porites australiensis) as temperature proxies

Tools to trace past productivity and ocean nutrients

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