Citation:

bg-14-3549-2017

Name: Seawater carbon chemistry and net primary production and net calcification in coral reef communities
Published: 2017-07-27
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Benthos; Calcification/Dissolution; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Entire community; Laboratory experiment; North Pacific; Primary production/Photosynthesis; Rocky-shore community; South Pacific; Tropical

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Abstract:

The threat represented by ocean acidification (OA) for coral reefs has received considerable attention because of the sensitivity of calcifiers to changing seawater carbonate chemistry. However, most studies have focused on the organismic response of calcification to OA, and only a few have addressed community-level effects, or investigated parameters other than calcification, such as photosynthesis. Light (photosynthetically active radiation, PAR) is a driver of biological processes on coral reefs, and the possibility that these processes might be perturbed by OA has important implications for community function. Here we investigate how CO2 enrichment affects the relationships between PAR and community net O2 production (Pnet), and between PAR and community net calcification (Gnet), using experiments on three coral communities constructed to match (i) the back reef of Mo'orea, French Polynesia, (ii) the fore reef of Mo'orea, and (iii) the back reef of O'ahu, Hawaii. The results were used to test the hypothesis that OA affects the relationship between Pnet and Gnet. For the three communities tested, pCO2 did not affect the Pnet-PAR relationship, but it affected the intercept of the hyperbolic tangent curve fitting the Gnet-PAR relationship for both reef communities in Mo'orea (but not in O'ahu). For the three communities, the slopes of the linear relationships between Pnet and Gnet were not affected by OA, although the intercepts were depressed by the inhibitory effect of high pCO2 on Gnet. Our result indicates that OA can modify the balance between net calcification and net photosynthesis of reef communities by depressing community calcification, but without affecting community photosynthesis.

Keyword(s):

Benthos; Calcification/Dissolution; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Entire community; Laboratory experiment; North Pacific; Primary production/Photosynthesis; Rocky-shore community; South Pacific; Tropical

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 by seacarb is 2017-07-27.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Type	Type		Comeau, Steeve		study
2	Experiment duration	Exp duration	days	Comeau, Steeve
3	Figure	Fig		Comeau, Steeve
4	Site	Site		Comeau, Steeve
5	Treatment	Treat		Comeau, Steeve
6	Irradiance	E	µmol/m²/s	Comeau, Steeve
7	Net photosynthesis rate	PN	mmol/m²/h	Comeau, Steeve
8	Calcification rate of calcium carbonate	Calc rate CaCO3	mmol/m²/h	Comeau, Steeve		net
9	pH	pH		Comeau, Steeve	Potentiometric	total scale
10	pH, standard error	pH std e	±	Comeau, Steeve	Potentiometric	total scale
11	Alkalinity, total	AT	µmol/kg	Comeau, Steeve	Potentiometric titration
12	Alkalinity, total, standard error	AT std e	±	Comeau, Steeve	Potentiometric titration
13	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Comeau, Steeve	Calculated using seacarb
14	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air), standard error	pCO2water_SST_wet std e	±	Comeau, Steeve	Calculated using seacarb
15	Carbon, inorganic, dissolved	DIC	µmol/kg	Comeau, Steeve	Calculated using seacarb
16	Carbon, inorganic, dissolved, standard error	DIC std e	±	Comeau, Steeve	Calculated using seacarb
17	Aragonite saturation state	Omega Arg		Comeau, Steeve	Calculated using seacarb
18	Aragonite saturation state, standard error	Omega Arg std e	±	Comeau, Steeve	Calculated using seacarb
19	Salinity	Sal		Comeau, Steeve
20	Temperature, water	Temp	°C	Comeau, Steeve
21	Temperature, water, standard error	T std e	±	Comeau, Steeve
22	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
23	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
24	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)
25	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)
26	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
27	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
28	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
29	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
30	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:

26390 data points

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