Citation:

fsw056

Name: Interpreting the role of pH on stable isotopes in large benthic foraminifera
Published: 2017
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Amphistegina gibbosa; Archaias angulatus; Benthos; Chromista; Coast and continental shelf; Foraminifera; Heterotrophic prokaryotes; Laboratory experiment; North Atlantic; Other studied parameter or process; Single species; Temperate

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Abstract:

Large benthic foraminifera (LBF) are prolific producers of calcium carbonate sediments in shallow, tropical environments that are being influenced by ocean acidification (OA). Two LBF species, Amphistegina gibbosa (Order Rotaliida) with low-Mg calcite tests and Archaias angulatus (Order Miliolida) with high-Mg calcite tests, were studied to assess the effects of pH 7.6 on oxygen and carbon isotopic fractionation between test calcite and ambient seawater. The delta 18O and delta 13C values of terminal chambers and of whole adult tests of both species after 6 weeks were not significantly different between pH treatments of 8.0 and 7.6. However, tests of juveniles produced during the 6-week treatments showed significant differences between delta 18O and delta 13C values from control (pH 8.0) when compared with the treatment (pH 7.6) for both species. Although each individual's growth was photographed and measured, difficulty in distinguishing and manually extracting newly precipitated calcite from adult specimens likely confounded any differences in isotopic signals. However, juvenile specimens that resulted from asexual reproduction that occurred during the experiments did not contain old carbonate that could confound the new isotopic signals. These data reveal a potential bias in the design of OA experiments if only adults are used to investigate changes in test chemistries. Furthermore, the results reaffirm that different calcification mechanisms in these two foraminiferal orders control the fractionation of stable isotopes in the tests and will reflect decreasing pH in seawater somewhat differently.

Keyword(s):

Amphistegina gibbosa; Archaias angulatus; Benthos; Chromista; Coast and continental shelf; Foraminifera; Heterotrophic prokaryotes; Laboratory experiment; North Atlantic; Other studied parameter or process; Single species; Temperate

Further details:

Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloïse; Orr, James C; Gentili, Bernard; Proye, Aurélien; Soetaert, Karline; Rae, James (2016): seacarb: seawater carbonate chemistry with R. R package version 3.1. https://cran.r-project.org/package=seacarb

Project(s):

Ocean Acidification International Coordination Centre (OA-ICC)

Comment:

In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2016) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation is 2016-12-12.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Type	Type		Robbins, Lisa L		study
2	Species	Species		Robbins, Lisa L
3	Registration number of species	Reg spec no		Robbins, Lisa L
4	Uniform resource locator/link to reference	URL ref		Robbins, Lisa L		WoRMS Aphia ID
5	Treatment	Treat		Robbins, Lisa L
6	Sample type	Samp type		Robbins, Lisa L
7	Replicates	Repl	#	Robbins, Lisa L		delta 18O
8	δ18O	δ18O	‰	Robbins, Lisa L
9	δ18O, standard deviation	δ18O std dev	±	Robbins, Lisa L
10	Replicates	Repl	#	Robbins, Lisa L		delta 13C
11	δ13C	δ13C	‰ PDB	Robbins, Lisa L
12	δ13C, standard deviation	δ13C std dev	±	Robbins, Lisa L
13	Replicates	Repl	#	Robbins, Lisa L		pH, total alkalinity
14	pH	pH		Robbins, Lisa L	Spectrophotometric	total scale
15	pH, standard deviation	pH std dev	±	Robbins, Lisa L	Spectrophotometric	total scale
16	Carbon, inorganic, dissolved	DIC	µmol/kg	Robbins, Lisa L	Calculated using CO2calc
17	Alkalinity, total	AT	µmol/kg	Robbins, Lisa L	Potentiometric titration
18	Alkalinity, total, standard deviation	AT std dev	±	Robbins, Lisa L	Potentiometric titration
19	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Robbins, Lisa L	Calculated using CO2calc
20	Calcite saturation state	Omega Cal		Robbins, Lisa L	Calculated using CO2calc
21	Temperature, water	Temp	°C	Robbins, Lisa L
22	Temperature, water, standard deviation	Temp std dev	±	Robbins, Lisa L
23	Salinity	Sal		Robbins, Lisa L
24	Salinity, standard deviation	Sal std dev	±	Robbins, Lisa L
25	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
26	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
27	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)
28	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)
29	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
30	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
31	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
32	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
33	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:

396 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Type (study)	2 Species	3 Reg spec no	4 URL ref (WoRMS Aphia ID)	5 Treat	6 Samp type	7 Repl [#] (delta 18O)	8 δ18O [‰]	9 δ18O std dev [±]	10 Repl [#] (delta 13C)	11 δ13C [‰ PDB]	12 δ13C std dev [±]	13 Repl [#] (pH, total alkalinity)	14 pH (total scale, Spectrophotometric)	15 pH std dev [±] (total scale, Spectrophotometric)	16 DIC [µmol/kg] (Calculated using CO2calc)	17 AT [µmol/kg] (Potentiometric titration)	18 AT std dev [±] (Potentiometric titration)	19 pCO2water_SST_wet [µatm] (Calculated using CO2calc)	20 Omega Cal (Calculated using CO2calc)	21 Temp [°C]	22 Temp std dev [±]	23 Sal	24 Sal std dev [±]	25 CSC flag (Calculated using seacarb afte...)	26 CO2 [µmol/kg] (Calculated using seacarb afte...)	27 fCO2water_SST_wet [µatm] (Calculated using seacarb afte...)	28 pCO2water_SST_wet [µatm] (Calculated using seacarb afte...)	29 [HCO3]- [µmol/kg] (Calculated using seacarb afte...)	30 [CO3]2- [µmol/kg] (Calculated using seacarb afte...)	31 DIC [µmol/kg] (Calculated using seacarb afte...)	32 Omega Arg (Calculated using seacarb afte...)	33 Omega Cal (Calculated using seacarb afte...)
laboratory	Amphistegina gibbosa (protist)	112863	marinespecies.org	pH 8.0	Adult whole test	10	20.03	0.20	10	21.29	0.52	18	8.00	0.01	5061.8	2305	8	466.7	4.40	23.9	0.10	31.8	0.2	8	13.81	465.20	466.71	1868.32	179.85	2061.99	2.89	4.43
laboratory	Amphistegina gibbosa (protist)	112863	marinespecies.org	pH 8.0	Adult terminal chamber	8	20.51	0.43	8	21.39	0.64	18	8.00	0.01	5061.8	2305	8	466.7	4.40	23.9	0.10	31.8	0.2	8	13.81	465.20	466.71	1868.32	179.85	2061.99	2.89	4.43
laboratory	Amphistegina gibbosa (protist)	112863	marinespecies.org	pH 8.0	Juvenile whole test	7	21.10	0.09	7	21.86	0.32	18	8.00	0.01	5061.8	2305	8	466.7	4.40	23.9	0.10	31.8	0.2	8	13.81	465.20	466.71	1868.32	179.85	2061.99	2.89	4.43
laboratory	Archaias angulatus (protist)	112792	marinespecies.org	pH 8.0	Adult whole test	12	0.22	0.46	12	1.33	1.04	18	8.00	0.01	5061.8	2305	8	466.7	4.40	23.9	0.10	31.8	0.2	8	13.81	465.20	466.71	1868.32	179.85	2061.99	2.89	4.43
laboratory	Archaias angulatus (protist)	112792	marinespecies.org	pH 8.0	Adult terminal chamber	21	0.61	0.91	21	1.51	0.44	18	8.00	0.01	5061.8	2305	8	466.7	4.40	23.9	0.10	31.8	0.2	8	13.81	465.20	466.71	1868.32	179.85	2061.99	2.89	4.43
laboratory	Archaias angulatus (protist)	112792	marinespecies.org	pH 8.0	Juvenile whole test	8	20.80	0.15	8	1.26	0.26	18	8.00	0.01	5061.8	2305	8	466.7	4.40	23.9	0.10	31.8	0.2	8	13.81	465.20	466.71	1868.32	179.85	2061.99	2.89	4.43
laboratory	Amphistegina gibbosa (protist)	112863	marinespecies.org	pH 7.6	Adult whole test	10	20.89	0.34	10	21.08	0.62	18	7.61	0.01	2228.3	2309	5	1290.2	2.01	23.9	0.12	32.1	0.5	8	38.13	1286.14	1290.31	2107.03	83.24	2228.40	1.34	2.05
laboratory	Amphistegina gibbosa (protist)	112863	marinespecies.org	pH 7.6	Adult terminal chamber	8	20.42	0.51	8	21.42	0.23	18	7.61	0.01	2228.3	2309	5	1290.2	2.01	23.9	0.12	32.1	0.5	8	38.13	1286.14	1290.31	2107.03	83.24	2228.40	1.34	2.05
laboratory	Amphistegina gibbosa (protist)	112863	marinespecies.org	pH 7.6	Juvenile whole test	7	20.37	0.10	7	0.57	0.25	18	7.61	0.01	2228.3	2309	5	1290.2	2.01	23.9	0.12	32.1	0.5	8	38.13	1286.14	1290.31	2107.03	83.24	2228.40	1.34	2.05
laboratory	Archaias angulatus (protist)	112792	marinespecies.org	pH 7.6	Adult whole test	13	20.02	0.34	13	1.85	0.38	18	7.61	0.01	2228.3	2309	5	1290.2	2.01	23.9	0.12	32.1	0.5	8	38.13	1286.14	1290.31	2107.03	83.24	2228.40	1.34	2.05
laboratory	Archaias angulatus (protist)	112792	marinespecies.org	pH 7.6	Adult terminal chamber	15	1.05	0.25	15	1.50	0.36	18	7.61	0.01	2228.3	2309	5	1290.2	2.01	23.9	0.12	32.1	0.5	8	38.13	1286.14	1290.31	2107.03	83.24	2228.40	1.34	2.05
laboratory	Archaias angulatus (protist)	112792	marinespecies.org	pH 7.6	Juvenile whole test	8	0.08	0.06	8	2.14	0.26	18	7.61	0.01	2228.3	2309	5	1290.2	2.01	23.9	0.12	32.1	0.5	8	38.13	1286.14	1290.31	2107.03	83.24	2228.40	1.34	2.05