Citation:

s00338-014-1132-7

Name: Effects of light and elevated pCO2 on the growth and photochemical efficiency of Acropora cervicornis
Published: 2014-07-24
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Acropora cervicornis; Animalia; Benthic animals; Benthos; Calcification/Dissolution; Cnidaria; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Growth/Morphology; Laboratory experiment; North Atlantic; Primary production/Photosynthesis; Single species; Temperate

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Abstract:

The effects of light and elevated pCO2 on the growth and photochemical efficiency of the critically endangered staghorn coral, Acropora cervicornis, were examined experimentally. Corals were subjected to high and low treatments of CO2 and light in a fully crossed design and monitored using 3D scanning and buoyant weight methodologies. Calcification rates, linear extension, as well as colony surface area and volume of A. cervicornis were highly dependent on light intensity. At pCO2 levels projected to occur by the end of the century from ocean acidification (OA), A. cervicornis exhibited depressed calcification, but no change in linear extension. Photochemical efficiency (F v /F m ) was higher at low light, but unaffected by CO2. Amelioration of OA-depressed calcification under high-light treatments was not observed, and we suggest that the high-light intensity necessary to reach saturation of photosynthesis and calcification in A. cervicornis may limit the effectiveness of this potentially protective mechanism in this species. High CO2 causes depressed skeletal density, but not linear extension, illustrating that the measurement of extension by itself is inadequate to detect CO2 impacts. The skeletal integrity of A. cervicornis will be impaired by OA, which may further reduce the resilience of the already diminished populations of this endangered species.

Keyword(s):

Acropora cervicornis; Animalia; Benthic animals; Benthos; Calcification/Dissolution; Cnidaria; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Growth/Morphology; Laboratory experiment; North Atlantic; Primary production/Photosynthesis; Single species; Temperate

Further details:

Lavigne, Héloïse; Epitalon, Jean-Marie; Gattuso, Jean-Pierre (2014): seacarb: seawater carbonate chemistry with R. R package version 3.0. 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 (Lavigne et al, 2014) 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 2014-07-23.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Species	Species		Enochs, I C
2	Treatment	Treat		Enochs, I C
3	Growth rate	µ	mg/day	Enochs, I C		weight
4	Growth rate, standard error	µ std e	±	Enochs, I C		weight
5	Growth rate	µ	mm/day	Enochs, I C		linear
6	Growth rate, standard error	µ std e	±	Enochs, I C		linear
7	Growth rate	µ	mm²/day	Enochs, I C		surface area
8	Growth rate, standard error	µ std e	±	Enochs, I C		surface area
9	Growth rate	µ	mm³/day	Enochs, I C		volume
10	Growth rate, standard error	µ std e	±	Enochs, I C		volume
11	Photochemical efficiency	delta F/Fm	arbitrary units	Enochs, I C
12	Photochemical efficiency, standard error	delta F/Fm std e	±	Enochs, I C
13	Salinity	Sal		Enochs, I C
14	Temperature, water	Temp	°C	Enochs, I C
15	Irradiance	E	E/m²/day	Enochs, I C
16	Alkalinity, total	AT	µmol/kg	Enochs, I C	Potentiometric titration
17	Carbon, inorganic, dissolved	DIC	µmol/kg	Enochs, I C	Coulometric titration
18	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Enochs, I C	Calculated using CO2SYS
19	Aragonite saturation state	Omega Arg		Enochs, I C	Calculated using CO2SYS
20	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
21	pH	pH		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale
22	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
23	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)
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	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
26	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
27	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
28	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:

112 data points

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