Constraints on the vital effect in coccolithophore and dinoflagellate calcite by oxygen isotopic modification of seawater

Hermoso, Michaël; Horner, Tristan J.; Minoletti, Fabrice; Rickaby, Rosalind E. M.

doi:10.1016/j.gca.2014.05.002

Cited by 44 publications

(96 citation statements)

References 56 publications

(63 reference statements)

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“…This species was studied in culture to assess changes in the morphology of its coccoliths with altered medium chemistry (Langer and Bode, 2011) and isotopically (Ziveri et al, 2012;Candelier et al, 2013;Hermoso et al 2014). In the present study, we used the strain RCC 1129 corresponding to the intermediate morphotype on the merit of coccolith size.…”

Section: Coccolithophore Strains Studiedmentioning

confidence: 99%

“…In the present study, we used the strain RCC 1129 corresponding to the intermediate morphotype on the merit of coccolith size. The same monoclonal strain was previously cultured by Candelier et al (2013) and Hermoso et al (2014) where cells were successively subjected to change in temperature and medium oxygen composition.…”

Section: Coccolithophore Strains Studiedmentioning

confidence: 99%

“…This taxon has been examined isotopically in culture (Rickaby et al, 2010;Hermoso et al 2014;Stevenson et al, 2014). Amongst all extant coccolithophore species, C. pelagicus has the longest geological record, with a first occurrence of the informally defined "C. pelagicus group" dated back to the Palaeogene (∼ 66 Myr ago).…”

Section: Coccolithophore Strains Studiedmentioning

confidence: 99%

“…Subsequently, pH was brought back to a value around 8 by addition of NaOH. Still under N 2 purge, we amended the medium in nitrate, phosphate, EDTA and vitamins according to the K/2 recipe (see Hermoso et al, 2014, for further details). To obtain the desired DIC level (2,4,6,8,10 and 12 mmol kg −1 sw ), we proceeded to add calculated amounts of NaHCO 3 powder in different aliquots with immediate pH adjustment to 8.2 (total scale), after which each DIC batch then was promptly filtered-sterilised and kept in Teflon-sealed flasks without headspace.…”

Section: Culture Medium Preparationmentioning

confidence: 99%

“…Therefore, geochemical data from ancient biomineralising organisms must be corrected in order to derive the primary signals from palaeoseawater. In the case of the foraminifera, corals and coccoliths, the foremost carbonate producers in the marine realm, there has been a considerable number of studies during which living organisms were cultured in strictly controlled environmental conditions and their biominerals measured for a range of isotopic systems to generate empirical proxy calibrations (Erez and Luz, 1982;Dudley et al, 1986;Spero et al, 1997;Bemis et al, 1998;Ziveri et al, 2003;Tripati et al, 2010;Rickaby et al, 2010;Rollion-Bard et al, 2011;Grauel et al, 2013;Hermoso et al, 2014;Minoletti et al, 2014;Hermoso, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Vanishing coccolith vital effects with alleviated carbon limitation

et al. 2016

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Abstract. By recreating a range of geologically relevant concentrations of dissolved inorganic carbon (DIC) in the laboratory, we demonstrate that the magnitude of the vital effects in both carbon and oxygen isotopes of coccolith calcite of multiple species relates to ambient DIC concentration. Under high DIC levels, all the examined coccoliths exhibit significantly reduced isotopic offsets from inorganic calcite compared to the substantial vital effects expressed at low (preindustrial and present-day) DIC concentrations. The supply of carbon to the cell exerts a primary control on biological fractionation in coccolith calcite via the modulation of coccolithophore growth rate, cell size and carbon utilisation by photosynthesis and calcification, altogether accounting for the observed interspecific differences between coccolith species. These laboratory observations support the recent hypothesis from field observations that the appearance of interspecific vital effect in coccolithophores coincides with the long-term Neogene decline of atmospheric CO 2 concentrations and bring further valuable constraints by demonstrating a convergence of all examined species towards inorganic values at high pCO 2 regimes. This study provides palaeoceanographers with a biogeochemical framework that can be utilised to further develop the use of calcareous nannofossils in palaeoceanography to derive sea surface temperature and pCO 2 levels, especially during periods of relatively elevated pCO 2 concentrations, as they prevailed during most of the Meso-Cenozoic.

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Section: Coccolithophore Strains Studiedmentioning

confidence: 99%

Section: Coccolithophore Strains Studiedmentioning

confidence: 99%

Section: Coccolithophore Strains Studiedmentioning

confidence: 99%

Section: Culture Medium Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Vanishing coccolith vital effects with alleviated carbon limitation

et al. 2016

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Calibration of stable isotope composition of Thoracosphaera heimii (dinoflagellate) calcite for reconstructing paleotemperatures in the intermediate photic zone

et al. 2014

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In this study we investigate the temperature dependence of oxygen isotope ratios preserved in calcite formed by the dinoflagellate Thoracosphaera heimii, focusing primarily on the development of a geological proxy. Geochemical analysis of the calcite shells produced by this species represents a valuable proxy for reconstructing environmental conditions in the intermediate photic zone. Calibration is based on isotopic analysis from culture experiments performed in very dilute batch conditions, as well as from near-monospecific T. heimii assemblages separated from core top sediments. Results are similar for both approaches and indicate that T. heimii shells have oxygen isotope compositions close to equilibrium values predicted for inorganic calcite precipitation. This calibration of the isotopic composition of dinoflagellate calcite indicates that monospecific assemblages of T. heimii can be used to unravel paleotemperatures in the intermediate photic zone by applying isotopic transfer functions for equilibrium calcite. In culture, however, a δ 18 O offset of À1‰ is observed at temperatures <17°C, which falls below the natural temperature range of this species. Culture analyses also reveal a relationship between temperature and carbon isotope composition of calcite. The mechanisms behind this relationship remain to be explored, but their identification may provide a better understanding of carbon isotope systematics from both biogeochemical and geological perspectives. Comparison of the oxygen isotope composition of T. heimii shells with that of shallower dwelling organisms, such as the coccolithophores, represents a valuable proxy for determining temperature gradients within the photic zone and may enable reconstruction of the evolution of the depth of the thermocline.

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Carbon and oxygen isotopes of bulk carbonate in sediment deposited beneath the eastern equatorial Pacific over the last 8 million years

et al. 2015

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To improve the understanding and utility of bulk carbonate stable carbon and oxygen isotope measurements, we examine sediment from cores in the eastern equatorial Pacific that span the last 8 Ma. O, higher sedimentation rates, and low content of coarse material suggest intensified wind-driven upwelling and enhanced primary productivity along the Pacific equator between 8.0 and 4.4 Ma, although a full understanding of bulk carbonate records will require extensive future work.

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Constraints on the vital effect in coccolithophore and dinoflagellate calcite by oxygen isotopic modification of seawater

Abstract: In this study, we show that there are independent controls of 18

Cited by 44 publications

References 56 publications

Vanishing coccolith vital effects with alleviated carbon limitation

Vanishing coccolith vital effects with alleviated carbon limitation

Calibration of stable isotope composition of Thoracosphaera heimii (dinoflagellate) calcite for reconstructing paleotemperatures in the intermediate photic zone

Carbon and oxygen isotopes of bulk carbonate in sediment deposited beneath the eastern equatorial Pacific over the last 8 million years

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