Citation:

2015PA002844

Name: Control of ambient pH on growth and stable isotopes in phytoplanktonic calcifying algae
Creator: Michael Hermoso
Published: 2015
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Chromista; Coccolithus pelagicus; Gephyrocapsa oceanica; Growth/Morphology; Haptophyta; Laboratory experiment; Laboratory strains; Not applicable; Pelagos; Phytoplankton; Single species

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Abstract:

The present work examines the relationship between pH-induced changes in growth and stable isotopic composition of coccolith calcite in two coccolithophore species with a geological perspective. These cells (Gephyrocapsa oceanica and Coccolithus pelagicus) with differing physiologies and vital effects possess a growth optimum corresponding to average pH of surface seawater in the geological period during their first known occurrence. Diminished growth rates outside of their optimum pH range are explained by the challenge of proton translocation into the extracellular environment at low pH, and enhanced aqueous CO2 limitation at high pH. These diminished growth rates correspond to a lower degree of oxygen isotopic disequilibrium in G. oceanica. In contrast, the slower growing and ancient species C. pelagicus, which typically precipitates near-equilibrium calcite, does not show any modulation of oxygen isotope signals with changing pH. In CO2-utilizing unicellular algae, carbon and oxygen isotope compositions are best explained by the degree of utilization of the internal dissolved inorganic carbon (DIC) pool and the dynamics of isotopic re-equilibration inside the cell. Thus, the "carbonate ion effect" may not apply to coccolithophores. This difference with foraminifera can be traced to different modes of DIC incorporation into these two distinct biomineralizing organisms. From a geological perspective, these findings have implications for refining the use of oxygen isotopes to infer more reliable sea surface temperatures (SSTs) from fossil carbonates, and contribute to a better understanding of how climate-relevant parameters are recorded in the sedimentary archive.

Keyword(s):

Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Chromista; Coccolithus pelagicus; Gephyrocapsa oceanica; Growth/Morphology; Haptophyta; Laboratory experiment; Laboratory strains; Not applicable; Pelagos; Phytoplankton; Single species

Further details:

Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloïse (2015): seacarb: seawater carbonate chemistry with R. R package version 3.0.8. https://cran.r-project.org/package=seacarb

Project(s):

Ocean Acidification International Coordination Centre (OA-ICC)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Type	Type		Hermoso, Michael		study
2	Species	Species		Hermoso, Michael
3	Strain	Strain		Hermoso, Michael
4	Registration number of species	Reg spec no		Hermoso, Michael		WoRMS Aphia ID
5	Uniform resource locator/link to reference	URL ref		Hermoso, Michael
6	pH	pH		Hermoso, Michael		initial, total scale
7	pH	pH		Hermoso, Michael		final, total scale
8	Time in days	Time	days	Hermoso, Michael
9	Cell density	Cells	#/ml	Hermoso, Michael		initial
10	Cell density	Cells	#/ml	Hermoso, Michael		final
11	Growth rate	µ	1/day	Hermoso, Michael
12	δ13C, calcite	δ13C cal	‰ PDB	Hermoso, Michael
13	δ18O, calcite	δ18O cal	‰ PDB	Hermoso, Michael
14	Coccosphere, diameter	Coccosp diam	µm	Hermoso, Michael
15	Carbon utilization index	µ/CO2	kg*µm/µmol/day	Hermoso, Michael
16	Temperature, water	Temp	°C	Hermoso, Michael
17	Salinity	Sal		Hermoso, Michael
18	Alkalinity, total	AT	µmol/kg	Hermoso, Michael
19	Carbon dioxide	CO2	µmol/kg	Hermoso, Michael
20	Bicarbonate ion	[HCO3]-	µmol/kg	Hermoso, Michael
21	Carbonate ion	[CO3]2-	µmol/kg	Hermoso, Michael
22	Calcite saturation state	Omega Cal		Hermoso, Michael
23	δ13C, carbon dioxide, aquatic	δ13C CO2 aq	‰	Hermoso, Michael
24	δ18O, water	δ18O H2O	‰ SMOW	Hermoso, Michael		seawater
25	δ18O, calcite	δ18O cal	‰ PDB	Hermoso, Michael		inorganic calcite after Kim and O'Neil [1997] without pH effect
26	δ18O, calcite	δ18O cal	‰ PDB	Hermoso, Michael		inorganic calcite after Kim and O'Neil [1997] accounting for the pH by Zeebe [2007]
27	δ18O, calcite	δ18O cal	‰ PDB	Hermoso, Michael		equilibrium calcite after Watkins et al. [2014]
28	δ18O, calcite	δ18O cal	‰ PDB	Hermoso, Michael		equilibrium calcite after Watkins et al. [2014] accounting for kinetic effect
29	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
30	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
31	Fugacity of carbon dioxide (water) at sea surface temperature (wet air)	fCO2water_SST_wet	µatm	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
32	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
33	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
34	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
35	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
36	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
37	Calcite saturation state	Omega Cal		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

1153 data points

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