Temperature dependence of oxygen isotope fractionation in coccolith calcite: A culture and core top calibration of the genus Calcidiscus

Candelier, Yaël; Minoletti, Fabrice; Probert, Ian; Hermoso, Michaël

doi:10.1016/j.gca.2012.09.040

Cited by 41 publications

(50 citation statements)

References 99 publications

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“…Mean exponential growth rates for C. braarudii at 15 • C were 0.68 d −1 . These values are well within the ranges reported in other studies carried out at similar temperatures for Calcidiscus (Langer et al, 2006;Buitenhuis et al, 2008;Fiorini et al, 2010Fiorini et al, , 2011Langer et al, 2012;Candelier et al, 2013;Müller et al, 2014) and H. carteri (Stoll et al, 2002;. Exponential growth rates of 0.4-0.5 d −1 signify that roughly half of the culture population undergoes cell division each day.…”

Section: Growth Ratessupporting

confidence: 89%

Physiology regulates the relationship between coccosphere geometry and growth phase in coccolithophores

et al. 2017

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Abstract. Coccolithophores are an abundant phytoplankton group that exhibit remarkable diversity in their biology, ecology and calcitic exoskeletons (coccospheres). Their extensive fossil record is a testament to their important biogeochemical role and is a valuable archive of biotic responses to environmental change stretching back over 200 million years. However, to realise the full potential of this archive for (palaeo-)biology and biogeochemistry requires an understanding of the physiological processes that underpin coccosphere architecture. Using culturing experiments on four modern coccolithophore species (Calcidiscus leptoporus, Calcidiscus quadriperforatus, Helicosphaera carteri and Coccolithus braarudii) from three long-lived families, we investigate how coccosphere architecture responds to shifts from exponential (rapid cell division) to stationary (slowed cell division) growth phases as cell physiology reacts to nutrient depletion. These experiments reveal statistical differences in coccosphere size and the number of coccoliths per cell between these two growth phases, specifically that cells in exponential-phase growth are typically smaller with fewer coccoliths, whereas cells experiencing growth-limiting nutrient depletion have larger coccosphere sizes and greater numbers of coccoliths per cell. Although the exact numbers are species-specific, these growth-phase shifts in coccosphere geometry demonstrate that the core physiological responses of cells to nutrient depletion result in increased coccosphere sizes and coccoliths per cell across four different coccolithophore families (Calcidiscaceae, Coccolithaceae, Isochrysidaceae and Helicosphaeraceae), a representative diversity of this phytoplankton group. Building on this, the direct comparison of coccosphere geometries in modern and fossil coccolithophores enables a proxy for growth phase to be developed that can be used to investigate growth responses to environmental change throughout their long evolutionary history. Our data also show that changes in growth rate and coccoliths per cell associated with growthphase shifts can substantially alter cellular calcite production. Coccosphere geometry is therefore a valuable tool for accessing growth information in the fossil record, providing unprecedented insights into the response of species to environmental change and the potential biogeochemical consequences.

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Section: Growth Ratessupporting

confidence: 89%

Physiology regulates the relationship between coccosphere geometry and growth phase in coccolithophores

et al. 2017

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“…(Erez and Luz, 1983;Dudley et al, 1986;Bemis et al, 1998;Ziveri et al, 2003;Candelier et al, 2013). Our experiments show that changing the δ 18 O w of the culturing medium also leads to variable alterations in the magnitude of the vital effect, ranging from no influence for G. oceanica to significant influence for C. leptoporus (~ leptoporus will be proportional to the δ 18 O w of the mineralising fluid.…”

Section: Stable Isotope Fractionation In the Dinoflagellate Thoracospmentioning

confidence: 54%

“…Furthermore, we plotted the calculated equilibrium of Kim and O'Neil (1997) corrected by a factor of 0.4 ‰ to the intersect of their equation to account for precipitation at pH 8.2 rather than 7.8 (Eq. 2; see Candelier et al, 2013). The oxygen isotope composition of "equilibrium" calcite (δ 18 O eq ) for each water sample is then calculated using measured δ 18 O w and for a temperature of calcification of 15 °C.…”

Section: Expression Of the Resultsmentioning

confidence: 99%

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

Hermoso

Horner

Minoletti

et al. 2014

Geochimica et Cosmochimica Acta

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“…Several studies have specifically measured coccolith δ 18 O with changing temperature in laboratory cultures in order to determine and calibrate the temperature-δ 18 O relationship for a wide range of species (Dudley et al, 1986;Ziveri et al, 2003;Candelier et al, 2013;Stevenson et al, 2014). Meanwhile, other culture studies have kept temperature constant but have manipulated the carbonate chemistry of the culture medium and the irradiance level (Ziveri et al, 2003;Rickaby et al, 2010;Hermoso, 2015) and found substantial modulation of the oxygen isotope vital effect with these parameters at constant temperature.…”

Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 99%

“…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%

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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Temperature dependence of oxygen isotope fractionation in coccolith calcite: A culture and core top calibration of the genus Calcidiscus

Cited by 41 publications

References 99 publications

Physiology regulates the relationship between coccosphere geometry and growth phase in coccolithophores

Physiology regulates the relationship between coccosphere geometry and growth phase in coccolithophores

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

Vanishing coccolith vital effects with alleviated carbon limitation

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