Citation:

PANGAEA.754858

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Abstract:

Among marine calcifiers, shelled pteropods are expected to be particularly sensitive to ocean acidification, generated by the uptake of anthropogenic CO2 by the ocean, and the associated decrease of the seawater saturation state with respect to aragonite (omega aragonite). The few available studies have mostly focused on polar species although pteropods are also important components of temperate and tropical ecosystems. It is also unknown which parameter of the carbonate system controls calcification. Specimens of the temperate Mediterranean species Creseis acicula were maintained under seven different conditions of the carbonate chemistry, obtained by manipulating pH and total alkalinity, with the goal to disentangle the effects of pH and omega aragonite. Respiration, excretion as well as rates of net and gross calcification were not directly affected by a decrease in pH but decreased significantly with a decrease of omega aragonite. The decrease of gross calcification rates is consistent with that reported for polar species. Although the organisms were apparently able to maintain gross calcification rates under slightly undersaturated aragonite conditions, the clear net dissolution signal observed below saturation suggests that they are not able to build a shell in seawater corrosive to aragonite. The decrease in respiration and excretion, and the low O:N molar ratio, could be due to the short time that the organisms were allowed to acclimatize to their new environment.

Project(s):

European network of excellence for Ocean Ecosystems Analysis (EUR-OCEANS)

European Project on Ocean Acidification (EPOCA)

Funding:

Seventh Framework Programme (FP7), grant/award no. 211384 : European Project on Ocean Acidification

Sixth Framework Programme (FP6), grant/award no. 511106 : European network of excellence for Ocean Ecosystems Analysis

Comment:

In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) 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).

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Experimental treatment	Exp treat		Comeau, Steeve
2	Identification	ID		Comeau, Steeve
3	Salinity	Sal		Comeau, Steeve
4	Temperature, water	Temp	°C	Comeau, Steeve
5	Temperature, standard deviation	T std dev	±	Comeau, Steeve
6	Carbonate system computation flag	CSC flag		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
7	pH	pH		Comeau, Steeve	pH meter (Metrohm, 826 pH mobile)	Total scale
8	pH, standard deviation	pH std dev	±	Comeau, Steeve
9	Alkalinity, total	AT	µmol/kg	Comeau, Steeve	Metrohm Titrando titrator
10	Alkalinity, total, standard deviation	AT std dev	±	Comeau, Steeve
11	Carbon, inorganic, dissolved	DIC	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
12	Carbon, inorganic, dissolved, standard deviation	DIC std dev	±	Comeau, Steeve
13	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
14	Carbon dioxide, partial pressure, standard deviation	pCO2 std dev	±	Comeau, Steeve
15	Fugacity of carbon dioxide (water) at sea surface temperature (wet air)	fCO2water_SST_wet	µatm	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
16	Fugacity of carbon dioxide in seawater, standard deviation	fCO2 std dev	±	Comeau, Steeve
17	Carbon dioxide	CO2	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
18	Carbon dioxide, standard deviation	CO2 std dev	±	Comeau, Steeve
19	Bicarbonate ion	[HCO3]-	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
20	Bicarbonate ion, standard deviation	[HCO3]- std dev	±	Comeau, Steeve
21	Carbonate ion	[CO3]2-	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
22	Carbonate ion, standard deviation	[CO3]2- std dev	±	Comeau, Steeve
23	Aragonite saturation state	Omega Arg		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
24	Aragonite saturation state, standard deviation	Omega Arg std dev	±	Comeau, Steeve
25	Calcite saturation state	Omega Cal		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
26	Calcite saturation state, standard deviation	Omega Cal std dev	±	Comeau, Steeve
27	Respiration rate, oxygen	Resp O2	µmol/mg/h	Comeau, Steeve	O2-meter (OXY-4 mini, PreSens)
28	Respiration rate, oxygen, standard deviation	Resp O2 std dev	±	Comeau, Steeve	Calculated
29	Ammonium, excretion	[NH4]+ exc	µmol/g/h	Comeau, Steeve	Colorimetric technique (Koroleff 1983) and a JenWay 6310 (Staffordshire, UK) flu
30	Ammonium, excretion, standard deviation	[NH4]+ exc std dev	±	Comeau, Steeve
31	Calcification rate of calcium carbonate	Calc rate CaCO3	µmol/g/h	Comeau, Steeve	Alkalinity anomaly technique (Smith and Key, 1975)
32	Calcification rate, standard deviation	Calc rate std dev	±	Comeau, Steeve
33	Calcification rate of calcium carbonate	Calc rate CaCO3	µmol/g/h	Comeau, Steeve	**45Ca incorporation
34	Calcification rate, standard deviation	Calc rate std dev	±	Comeau, Steeve

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Size:

392 data points

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