A numerical model of trace-element coprecipitation in a physicochemical calcification system: Application to coral biomineralization and trace-element ‘vital effects’

Sinclair, D. J.; Risk, Michael J.

doi:10.1016/j.gca.2006.05.019

Cited by 53 publications

(37 citation statements)

References 60 publications

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“…In corals, calcium uptake is directly related to proton pumping (McConnaughey and Whelan, 1997;Sinclair and Risk, 2006). The efflux of H + during calcification (Glas et al, 2012) may therefore help to constrain estimates of calcium pumping rates during calcification.…”

Section: Ca 2+ Transport In Foraminiferamentioning

confidence: 99%

“…Compared to foraminifera, biomineralization in corals (Al-Horani et al, 2003;Sinclair and Risk, 2006;Venn et al, 2013), coccolithophores (Marsh, 2003;Taylor et al, 2011;Ziveri et al, 2012;Bach et al, 2013), gastropods (e.g. Nehrke and Nouet, 2011) and bivalves (Nudelman et al, 2006;Nehrke et al, 2012;Shi et al, 2013) are understood in greater detail.…”

Section: Future Directionsmentioning

confidence: 99%

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Biomineralization in perforate foraminifera

Nooijer

Spero

Erez

et al. 2014

Earth-Science Reviews

210

190

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a b s t r a c t a r t i c l e i n f oIn this paper, we review the current understanding of biomineralization in perforate foraminifera. Ideas on the mechanisms responsible for the flux of Ca 2+ and inorganic carbon from seawater into the test were originally based on light and electron microscopic observations of calcifying foraminifera. From the 1980s onward, tracer experiments, fluorescent microscopy and high-resolution test geochemical analysis have added to existing calcification models. Despite recent insights, no general consensus on the physiological basis of foraminiferal biomineralization exists. Current models include seawater vacuolization, transmembrane ion transport, involvement of organic matrices and/or pH regulation, although the magnitude of these controls remain to be quantified. Disagreement between currently available models may be caused by the use of different foraminiferal species as subject for biomineralization experiments and/or lack of a more systematic approach to study (dis)similarities between taxa. In order to understand foraminiferal controls on element incorporation and isotope fractionation, and thereby improve the value of foraminifera as paleoceanographic proxies, it is necessary to identify key processes in foraminiferal biomineralization and formulate hypotheses regarding the involved physiological pathways to provide directions for future research.

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Section: Ca 2+ Transport In Foraminiferamentioning

confidence: 99%

Section: Future Directionsmentioning

confidence: 99%

Biomineralization in perforate foraminifera

Nooijer

Spero

Erez

et al. 2014

Earth-Science Reviews

210

190

View full text Add to dashboard Cite

show abstract

“…Geochemical models (e.g. Adkins et al 2003, Sinclair & Risk 2006, however, have considered diffusion of CO 2 across the calicoblastic epithelium, and passive entry of seawater, e.g. through pericellular channels (see Cohen & McConnaughey 2003).…”

Section: Mechanism Of Coral Calcificationmentioning

confidence: 99%

Possible effects of ocean acidification on coral reef biogeochemistry: topics for research

Atkinson¹,

Cuet²

2008

Mar. Ecol. Prog. Ser.

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“…recently conducted laboratory precipitation experiments that characterized the abiogenic carbonate chemistry and temperature controls on Sr/Ca and U/Ca partitioning between aragonite and seawater. Previous studies consistently report positive correlations between coral Sr/Ca and U/Ca ratios (Cardinal et al, 2001;Hendy et al, 2002;Quinn and Sampson, 2002;Fallon et al, 2003;Sinclair and Risk, 2006;Felis et al, 2009Felis et al, , 2012Jones et al, 2015). However, correlations between Sr/Ca and U/Ca are not found in experimentally precipitated abiogenic aragonite, in which Sr/Ca is controlled by temperature and is insensitive to [CO Quantitative, geochemical models of the coral biomineralization process provide a framework within which the environmental drivers of variability in skeletal composition (e.g.…”

Section: Modeling Vital Effectsmentioning

confidence: 83%

Coral biomineralization, climate proxies and the sensitivity of coral reefs to CO2-driven climate change

DeCarlo¹

2017

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Scleractinian corals extract calcium (Ca 2+ ) and carbonate (CO 2−3 ) ions from seawater to construct their calcium carbonate (CaCO 3 ) skeletons. Key to the coral biomineralization process is the active elevation of the CO 2− 3 concentration of the calcifying fluid to achieve rapid nucleation and growth of CaCO 3 crystals. Coral skeletons contain valuable records of past climate variability and contribute to the formation of coral reefs. However, limitations in our understanding of coral biomineralization hinder the accuracy of (1) coral-based reconstructions of past climate, and (2) predictions of coral reef futures as anthropogenic CO 2 emissions drive declines in seawater CO 2− 3 concentration.In this thesis, I investigate the mechanism of coral biomineralization and evaluate the sensitivity of coral reef CaCO 3 production to seawater carbonate chemistry. First, I conducted abiogenic CaCO 3 precipitation experiments that identified the U/Ca ratio as a proxy for fluid CO 2− 3 concentration. Based on these experimental results, I developed a quantitative coral biomineralization model that predicts temperature can be reconstructed from coral skeletons by combining Sr/Ca -which is sensitive to both temperature and CO 2− 3-with U/Ca into a new proxy called "Sr-U". I tested this prediction with 14 corals from the Pacific Ocean and the Red Sea spanning mean annual temperatures of 25.7-30.1 ∘ C and found that Sr-U has uncertainty of only 0.5 ∘ C, twice as accurate as conventional coral-based thermometers. Second, I investigated the processes that differentiate reef-water and open-ocean carbonate chemistry, and the sensitivity of ecosystem-scale calcification to these changes. On Dongsha Atoll in the northern South China Sea, metabolic activity of resident organisms elevates reef-water CO 2− 3 twice as high as the surrounding open ocean, driving rates of ecosystem calcification higher than any other coral reef studied to date. When high temperatures stressed the resident coral community, metabolic activity slowed, with dramatic effects on reef-water chemistry and ecosystem calcification. Overall, my thesis highlights how the modulation of CO 2− 3 , by benthic communities on the reef and individual coral polyps in the colony, controls the sensitivity of coral reefs to future ocean acidification and influences the climate records contained in the skeleton.

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A numerical model of trace-element coprecipitation in a physicochemical calcification system: Application to coral biomineralization and trace-element ‘vital effects’

Cited by 53 publications

References 60 publications

Biomineralization in perforate foraminifera

Biomineralization in perforate foraminifera

Possible effects of ocean acidification on coral reef biogeochemistry: topics for research

Coral biomineralization, climate proxies and the sensitivity of coral reefs to CO2-driven climate change

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