Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato)

Cubillos, Joana C.; Henderiks, Jorijntje; Beaufort, Luc; Howard, William R; Hallegraeff, Gustaaf M.

doi:10.1016/j.marmicro.2012.04.005

Cited by 22 publications

(21 citation statements)

References 38 publications

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“…The calcite weights of individual coccoliths are at least two orders of magnitude higher than the average weight of coccoliths produced by the smaller E. huxleyi (Beaufort and Heussner, 1999;Young and Ziveri, 2000;Cubillos et al, 2012). Hence, this species is an important contributor to calcite export into the sediments (Broerse et al, 2000).…”

Section: A C Gerecht Et Al: High Temperature Decreases the Pic / Pmentioning

confidence: 98%

“…Coccolith length measured by this method considers the proximal shield only as the larger distal shield is non-birefringent under crossed polarizers (e.g. Cubillos et al, 2012).…”

Section: Coccosphere and Coccolith Morphology 241 Coccolith Dimensionsmentioning

confidence: 99%

“…Overlapping coccolith size ranges have been previously described for these two subspecies, and our results confirm that subsp. pelagicus is the smaller morphotype of the two (Baumann et al, 2000;Geisen et al, 2002;Cubillos et al, 2012). There was no effect of either temperature or P-limitation on the mean coccolith volume and the same amount of calcite was fixed into individual coccoliths independently of the tested abiotic factors.…”

Section: Effect Of Phosphorus Limitation and Temperature On Coccolithmentioning

confidence: 99%

“…pelagicus. The main reason for this difference in calcite content estimates is that Coccolithus coccoliths are not entirely birefringent (Beaufort, 2005;Cubillos et al, 2012), therefore calculations based on birefringence will underestimate absolute weight but are useful for comparative purposes.…”

Section: Effect Of Phosphorus Limitation and Temperature On Coccolithmentioning

confidence: 99%

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High temperature decreases the PIC / POC ratio and increases phosphorus requirements in Coccolithus pelagicus (Haptophyta)

et al. 2014

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Abstract. Rising ocean temperatures will likely increase stratification of the water column and reduce nutrient input into the photic zone. This will increase the likelihood of nutrient limitation in marine microalgae, leading to changes in the abundance and composition of phytoplankton communities, which in turn will affect global biogeochemical cycles. Calcifying algae, such as coccolithophores, influence the carbon cycle by fixing CO 2 into particulate organic carbon through photosynthesis (POC production) and into particulate inorganic carbon through calcification (PIC production). As calcification produces a net release of CO 2 , the ratio of PIC to POC production determines whether coccolithophores act as a source (high PIC / POC) or a sink (low PIC / POC) of atmospheric CO 2 . We studied the effect of phosphorus (P-) limitation and high temperature on the physiology and the PIC / POC ratio of two subspecies of Coccolithus pelagicus. This large and heavily calcified species is a major contributor to calcite export from the photic zone into deep-sea reservoirs. Phosphorus limitation did not influence exponential growth rates in either subspecies, but P-limited cells had significantly lower cellular P-content. One of the subspecies was subjected to a 5 • C temperature increase from 10 • C to 15 • C, which did not affect exponential growth rates either, but nearly doubled cellular P-content under both high and low phosphate availability. This temperature increase reduced the PIC / POC ratio by 40-60 %, whereas the PIC / POC ratio did not differ between P-limited and nutrientreplete cultures when the subspecies were grown near their respective isolation temperature. Both P-limitation and elevated temperature significantly increased coccolith malformations. Our results suggest that a temperature increase may intensify P-limitation due to a higher P-requirement to maintain growth and POC production rates, possibly reducing abundances in a warmer ocean. Under such a scenario C. pelagicus may decrease its calcification rate relative to photosynthesis, thus favouring CO 2 sequestration over release. It seems unlikely that P-limitation by itself causes changes in the PIC / POC ratio in this species.

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Section: A C Gerecht Et Al: High Temperature Decreases the Pic / Pmentioning

confidence: 98%

“…Coccolith length measured by this method considers the proximal shield only as the larger distal shield is non-birefringent under crossed polarizers (e.g. Cubillos et al, 2012).…”

Section: Coccosphere and Coccolith Morphology 241 Coccolith Dimensionsmentioning

confidence: 99%

Section: Effect Of Phosphorus Limitation and Temperature On Coccolithmentioning

confidence: 99%

Section: Effect Of Phosphorus Limitation and Temperature On Coccolithmentioning

confidence: 99%

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High temperature decreases the PIC / POC ratio and increases phosphorus requirements in Coccolithus pelagicus (Haptophyta)

et al. 2014

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“…4) should be interpreted as a first approximation. A power function relationship was recently indicated for the coccolith distal shield length (DSL) and the coccolith weight of Coccolithus pelagicus (Cubillos et al, 2012). If a similar power function exists connecting the coccosphere/cell diameter with the coccolith volume has to be validated in future studies.…”

Section: Coccosphere/cell Diameter and Coccolith Volumementioning

confidence: 99%

Influence of CO2 and nitrogen limitation on the coccolith volume of Emiliania huxleyi (Haptophyta)

et al. 2012

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Abstract. Coccolithophores, a key phytoplankton group, are one of the most studied organisms regarding their physiological response to ocean acidification/carbonation. The biogenic production of calcareous coccoliths has made coccolithophores a promising group for paleoceanographic research aiming to reconstruct past environmental conditions. Recently, geochemical and morphological analyses of fossil coccoliths have gained increased interest in regard to changes in seawater carbonate chemistry. The cosmopolitan coccolithophore Emiliania huxleyi (Lohm.) Hay and Mohler was cultured over a range of pCO 2 levels in controlled laboratory experiments under nutrient replete and nitrogen limited conditions. Measurements of photosynthesis and calcification revealed, as previously published, an increase in particulate organic carbon production and a moderate decrease in calcification from ambient to elevated pCO 2 . The enhancement in particulate organic carbon production was accompanied by an increase in cell diameter. Changes in coccolith volume were best correlated with the coccosphere/cell diameter and no significant correlation was found between the coccolith volume and the particulate inorganic carbon production. The conducted experiments revealed that the coccolith volume of E. huxleyi is variable with aquatic CO 2 concentration but its sensitivity is rather small in comparison with its sensitivity to nitrogen limitation. Comparing coccolith morphological and geometrical parameters like volume, mass and size to physiological parameters under controlled laboratory conditions is an important step to understand variations in fossil coccolith geometry.

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Evaluation of particle recovery from microalgae

Chairopoulou

Kokkinos²,

García‐Triñanes³

et al. 2021

Advanced Powder Technology

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Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato)

Cited by 22 publications

References 38 publications

High temperature decreases the PIC / POC ratio and increases phosphorus requirements in <i>Coccolithus pelagicus</i> (Haptophyta)

High temperature decreases the PIC / POC ratio and increases phosphorus requirements in <i>Coccolithus pelagicus</i> (Haptophyta)

Influence of CO<sub>2</sub> and nitrogen limitation on the coccolith volume of <I>Emiliania huxleyi</I> (Haptophyta)

Evaluation of particle recovery from microalgae

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Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato)

Cited by 22 publications

References 38 publications

High temperature decreases the PIC / POC ratio and increases phosphorus requirements in &lt;i&gt;Coccolithus pelagicus&lt;/i&gt; (Haptophyta)

High temperature decreases the PIC / POC ratio and increases phosphorus requirements in &lt;i&gt;Coccolithus pelagicus&lt;/i&gt; (Haptophyta)

Influence of CO&lt;sub&gt;2&lt;/sub&gt; and nitrogen limitation on the coccolith volume of &lt;I&gt;Emiliania huxleyi&lt;/I&gt; (Haptophyta)

Evaluation of particle recovery from microalgae

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High temperature decreases the PIC / POC ratio and increases phosphorus requirements in <i>Coccolithus pelagicus</i> (Haptophyta)

High temperature decreases the PIC / POC ratio and increases phosphorus requirements in <i>Coccolithus pelagicus</i> (Haptophyta)

Influence of CO<sub>2</sub> and nitrogen limitation on the coccolith volume of <I>Emiliania huxleyi</I> (Haptophyta)