Incorporation of Na and S in bamboo coral skeletons

Flöter, Sebastian; Fietzke, Jan; Gutjahr, Marcus; Nehrke, Gernot; Eisenhauer, Anton

doi:10.1016/j.chemgeo.2022.120795

Cited by 8 publications

(3 citation statements)

References 81 publications

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“…For alkaline and alkaline earth elements (Na, Mg, Sr), the values are strongly increased in external locations. For Na, it is totally different from the situation observed by Floeter et al [45]. For Fe and Zn, the discrepancies are variable.…”

Section: Resultscontrasting

confidence: 83%

“…Hill et al [44] claimed that Sr/Ca ratio in bamboo corals preserves the original ratio of those cation molecules in the water column. An interesting study on the role of Na and S can be found in Floeter [45]. Nevertheless, the detailed studies are ambiguous-some data testify to the fact that the rings have an annual nature, while longer-term scrutiny contradicts this conclusion [46,47].…”

Section: Introductionmentioning

confidence: 99%

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Studies on Chemical Composition, Structure and Potential Applications of Keratoisis Corals

Gorzelak

Nowak²,

Kuczumow³

et al. 2023

IJMS

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The chemical composition and structure of bamboo octocoral Keratoisis spp. skeletons were investigated by using: Scanning Electron Microscopy SEM, Raman Microscopy, X-ray Diffraction XRD, Laser Ablation–Inductively Coupled Plasma LA-ICP, and amino acid analyzers. Elements discovered in the nodes (mainly organic parts of the skeleton) of bamboo corals showed a very interesting arrangement in the growth ring areas, most probably enabling the application of bamboo corals as palaeochronometers and palaeothermometers. LA-ICP results showed that these gorgonian corals had an unusually large content of bromine, larger than any other organism yet studied. The local concentration of bromine in the organic part of the growth rings of one of the studied corals grew up to 29,000 ppm of bromine. That is over 440 times more than is contained in marine water and 35 times more than Murex contains, the species which was used to make Tyrian purple in ancient times. The organic matter of corals is called gorgonin, the specific substance that both from the XRD and Raman studies seem to be very similar to the reptile and bird keratins and less similar to the mammalian keratins. The missing cross-linking by S-S bridges, absence of aromatic rings, and significant participation of β-turn organization of peptides differs gorgonin from keratins. Perhaps, the gorgonin belongs to the affined but still different substances concerning reptile and bird keratin and in relation to the more advanced version—the mammalian one. Chemical components of bamboo corals seem to have great medical potential, with the internodes as material substituting the hard tissues and the nodes as the components of medicines.

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Section: Resultscontrasting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Studies on Chemical Composition, Structure and Potential Applications of Keratoisis Corals

Gorzelak

Nowak²,

Kuczumow³

et al. 2023

IJMS

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“…This leads to a higher carbonate saturation, which favors aragonite precipitation. By contrast, bamboo corals experience a more complex anion exchange (bicarbonate), which includes a combination of Ca/ proton pumping and bicarbonate active transport, the latter of which has been proposed for sulfate incorporation (Flöter et al, 2022). Bicarbonate active transport delivers bicarbonate to the calcifying fluid to keep the calcite saturation at a high level and increases carbonate ion concentration by shifting the calcifying fluid pH.…”

Section: Iodine Concentration In Aragonite Versus Calcitementioning

confidence: 99%

Iodine-to-calcium ratios in deep-sea scleractinian and bamboo corals

Sun,

Robinson,

Parkinson

et al. 2023

Front. Mar. Sci.

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The distribution of dissolved iodine in seawater is sensitive to multiple biogeochemical cycles, including those of nitrogen and oxygen. The iodine-to-calcium ratio (I/Ca) of marine carbonates, such as bulk carbonate or foraminifera, has emerged as a potential proxy for changes in past seawater oxygenation. However, the utility of the I/Ca proxy in deep-sea corals, natural archives of seawater chemistry with wide spatial coverage and radiometric dating potential, remains unexplored. Here, we present the first I/Ca data obtained from modern deep-sea corals, specifically scleractinian and bamboo corals, collected from the Atlantic, Eastern Pacific, and Southern Oceans, encompassing a wide range of seawater oxygen concentrations (10–280 μmol/kg). In contrast to thermodynamic predictions, we observe higher I/Ca ratios in aragonitic corals (scleractinian) compared to calcitic corals (bamboo). This observation suggests a strong biological control during iodate incorporation into deep-sea coral skeletons. For the majority of scleractinian corals, I/Ca exhibits a covariation with local seawater iodate concentrations, which is closely related to seawater oxygen content. Scleractinian corals also exhibit notably lower I/Ca below a seawater oxygen threshold of approximately 160 μmol/kg. In contrast, no significant differences in I/Ca are found among bamboo corals across the range of oxygen concentrations encountered (15–240 μmol/kg). In the North Atlantic, several hydrographic factors, such as temperature and/or salinity, may additionally affect coral I/Ca. Our results highlight the potential of I/Ca ratios in deep-sea scleractinian corals to serve as an indicator of past seawater iodate concentrations, providing valuable insights into historical seawater oxygen levels.

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Precipitation of CaCO3 in natural and man-made aquatic environments - Mechanisms, analogues, and proxies

Dietzel,

Boch

2024

Geochemistry

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Incorporation of Na and S in bamboo coral skeletons

Cited by 8 publications

References 81 publications

Studies on Chemical Composition, Structure and Potential Applications of Keratoisis Corals

Studies on Chemical Composition, Structure and Potential Applications of Keratoisis Corals

Iodine-to-calcium ratios in deep-sea scleractinian and bamboo corals

Precipitation of CaCO3 in natural and man-made aquatic environments - Mechanisms, analogues, and proxies

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