Citation:

lno.10161

Name: The modulating effect of light intensity on the response of the coccolithophore Gephyrocapsa oceanica to ocean acidification
Published: 2015
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Bottles or small containers/Aquaria (<20 L); Calcification/Dissolution; Chromista; Gephyrocapsa oceanica; Growth/Morphology; Haptophyta; Laboratory experiment; Laboratory strains; Light; North Atlantic; Pelagos; Phytoplankton; Primary production/Photosynthesis; Single species

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Abstract:

Global change leads to a multitude of simultaneous modifications in the marine realm among which shoaling of the upper mixed layer, leading to enhanced surface layer light intensities, as well as increased carbon dioxide (CO2) concentration are some of the most critical environmental alterations for phytoplankton. In this study, we investigated the responses of growth, photosynthetic carbon fixation and calcification of the coccolithophore Gephyrocapsa oceanica to elevated inline image (51 Pa, 105 Pa, and 152 Pa) (1 Pa = 10 µatm) at a variety of light intensities (50-800 µmol photons/m**2/s). By fitting the light response curve, our results showed that rising inline image reduced the maximum rates for growth, photosynthetic carbon fixation and calcification. Increasing light intensity enhanced the sensitivity of these rate responses to inline image, and shifted the inline image optima toward lower levels. Combining the results of this and a previous study (Sett et al. 2014) on the same strain indicates that both limiting low inline image and inhibiting high inline image levels (this study) induce similar responses, reducing growth, carbon fixation and calcification rates of G. oceanica. At limiting low light intensities the inline image optima for maximum growth, carbon fixation and calcification are shifted toward higher levels. Interacting effects of simultaneously occurring environmental changes, such as increasing light intensity and ocean acidification, need to be considered when trying to assess metabolic rates of marine phytoplankton under future ocean scenarios.

Keyword(s):

Bottles or small containers/Aquaria (<20 L); Calcification/Dissolution; Chromista; Gephyrocapsa oceanica; Growth/Morphology; Haptophyta; Laboratory experiment; Laboratory strains; Light; North Atlantic; Pelagos; Phytoplankton; Primary production/Photosynthesis; 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)

Comment:

In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2015) 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 2016-11-03.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Type	Type		Zhang, Yong		study
2	Species	Species		Zhang, Yong
3	Registration number of species	Reg spec no		Zhang, Yong
4	Uniform resource locator/link to reference	URL ref		Zhang, Yong		WoRMS Aphia ID
5	Carbon dioxide, partial pressure	pCO2	Pa	Zhang, Yong
6	Carbon dioxide, partial pressure, standard deviation	pCO2 std dev	±	Zhang, Yong
7	Light intensity	Io	µmol/m²/s	Zhang, Yong
8	Growth rate	µ	1/day	Zhang, Yong
9	Growth rate, standard deviation	µ std dev	±	Zhang, Yong
10	Maximal electron transport rate, relative	rETR max		Zhang, Yong
11	Maximal electron transport rate, relative, standard deviation	rETR max std dev	±	Zhang, Yong
12	Initial slope of rapid light curve	alpha	µmol electrons/µmol quanta	Zhang, Yong
13	Initial slope of rapid light curve, standard deviation	alpha std dev	±	Zhang, Yong
14	Light saturation point	Ik	µmol/m²/s	Zhang, Yong
15	Light saturation point, standard deviation	Ik std dev	±	Zhang, Yong
16	Particulate organic carbon production per cell	POC prod/cell	pg/#/day	Zhang, Yong
17	Particulate organic carbon, production, standard deviation	POC prod std dev	±	Zhang, Yong
18	Particulate inorganic carbon production per cell	PIC prod/cell	pg/#/day	Zhang, Yong
19	Particulate inorganic carbon, production, standard deviation	PIC prod std dev	±	Zhang, Yong
20	Particulate inorganic carbon/particulate organic carbon ratio	PIC/POC		Zhang, Yong
21	Particulate inorganic carbon/particulate organic carbon ratio, standard deviation	PIC/POC ratio std dev	±	Zhang, Yong
22	Carbon, organic, particulate/Nitrogen, organic, particulate ratio	POC/PON		Zhang, Yong
23	Carbon, organic, particulate/Nitrogen, organic, particulate ratio, standard deviation	POC/PON std dev	±	Zhang, Yong
24	Alkalinity, total	AT	µmol/kg	Zhang, Yong	Potentiometric titration
25	Alkalinity, total, standard deviation	AT std dev	±	Zhang, Yong	Potentiometric titration
26	Carbon, inorganic, dissolved	DIC	µmol/kg	Zhang, Yong
27	Carbon, inorganic, dissolved, standard deviation	DIC std dev	±	Zhang, Yong
28	pH	pH		Zhang, Yong	Calculated using CO2SYS	total scale
29	pH, standard deviation	pH std dev	±	Zhang, Yong	Calculated using CO2SYS	total scale
30	Bicarbonate ion	[HCO3]-	µmol/kg	Zhang, Yong	Calculated using CO2SYS
31	Bicarbonate ion, standard deviation	[HCO3]- std dev	±	Zhang, Yong	Calculated using CO2SYS
32	Carbonate ion	[CO3]2-	µmol/kg	Zhang, Yong	Calculated using CO2SYS
33	Carbonate ion, standard deviation	[CO3]2- std dev	±	Zhang, Yong	Calculated using CO2SYS
34	Carbon dioxide	CO2	µmol/kg	Zhang, Yong	Calculated using CO2SYS
35	Carbon dioxide, standard deviation	CO2 std dev	±	Zhang, Yong	Calculated using CO2SYS
36	Calcite saturation state	Omega Cal		Zhang, Yong	Calculated using CO2SYS
37	Calcite saturation state, standard deviation	Omega Cal std dev	±	Zhang, Yong	Calculated using CO2SYS
38	Temperature, water	Temp	°C	Zhang, Yong
39	Salinity	Sal		Zhang, Yong
40	Phosphate	PHSPHT	µmol/kg	Zhang, Yong
41	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
42	pH	pH		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale
43	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
44	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)
45	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)
46	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
47	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
48	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
49	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:

882 data points

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