Citation:

php.12363

Name: Solar UV irradiances modulate effects of ocean acidification on the Coccolithophorid Emiliania huxleyi
Published: 2015-03-05
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Bottles or small containers/Aquaria (<20 L); Calcification/Dissolution; Chromista; Emiliania huxleyi; Growth/Morphology; Haptophyta; Laboratory experiment; Laboratory strains; Light; Not applicable; Pelagos; Phytoplankton; Primary production/Photosynthesis; Single species

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Abstract:

Emiliania huxleyi, the most abundant coccolithophorid in the oceans, is naturally exposed to solar UV radiation (UVR, 280-400 nm) in addition to photosynthetically active radiation (PAR). We investigated the physiological responses of E. huxleyi to the present day and elevated CO2 (390 vs 1000 µatm; with pH(NBS) 8.20 vs 7.86) under indoor constant PAR and fluctuating solar radiation with or without UVR. Enrichment of CO2 stimulated the production rate of particulate organic carbon (POC) under constant PAR, but led to unchanged POC production under incident fluctuating solar radiation. The production rates of particulate inorganic carbon (PIC) as well as PIC/POC ratios were reduced under the elevated CO2, ocean acidification (OA) condition, regardless of PAR levels, and the presence of UVR. However, moderate levels of UVR increased PIC production rates and PIC/POC ratios. OA treatment interacted with UVR to influence the alga's physiological performance, leading to reduced specific growth rate in the presence of UVA (315-400 nm) and decreased quantum yield, along with enhanced nonphotochemical quenching, with addition of UVB (280-315 nm). The results clearly indicate that UV radiation needs to be invoked as a key stressor when considering the impacts of ocean acidification on E. huxleyi.

Keyword(s):

Bottles or small containers/Aquaria (<20 L); Calcification/Dissolution; Chromista; Emiliania huxleyi; Growth/Morphology; Haptophyta; Laboratory experiment; Laboratory strains; Light; Not applicable; Pelagos; Phytoplankton; Primary production/Photosynthesis; Single species

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).

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Species	Species		Xu, Kai
2	Figure	Fig		Xu, Kai
3	Experiment	Exp		Xu, Kai
4	Treatment	Treat		Xu, Kai
5	Duration, number of days	Duration	days	Xu, Kai		minimal
6	Duration, number of days	Duration	days	Xu, Kai		maximum
7	Irradiance	E	µmol/m²/s	Xu, Kai
8	Irradiance	E	µmol/m²/s	Xu, Kai		mean daytime
9	Radiation, photosynthetically active, dose daily	PAR dose	MJ/m²/day	Xu, Kai
10	Ultraviolet-a radiation, dose daily	UV-a dose	kJ/m²/day	Xu, Kai
11	Ultraviolet-b radiation, dose daily	UV-b dose	kJ/m²/day	Xu, Kai
12	Growth rate	µ	1/day	Xu, Kai
13	Growth rate, standard deviation	µ std dev	±	Xu, Kai
14	Particulate organic carbon production per cell	POC prod/cell	pmol/#/day	Xu, Kai
15	Particulate organic carbon, production, standard deviation	POC prod std dev	±	Xu, Kai
16	Particulate inorganic carbon production per cell	PIC prod/cell	pmol/#/day	Xu, Kai
17	Particulate inorganic carbon, production, standard deviation	PIC prod std dev	±	Xu, Kai
18	Particulate inorganic carbon/particulate organic carbon ratio	PIC/POC		Xu, Kai
19	Particulate inorganic carbon/particulate organic carbon ratio, standard deviation	PIC/POC ratio std dev	±	Xu, Kai
20	Coccosphere, diameter	Coccosp diam	µm	Xu, Kai
21	Time of day	Time of day		Xu, Kai
22	Photochemical efficiency	delta F/Fm	arbitrary units	Xu, Kai
23	Photochemical efficiency, standard deviation	delta F/Fm std dev	±	Xu, Kai
24	Radiation, photosynthetically active	PAR	W/m²	Xu, Kai
25	Ultraviolet radiation	UV rad	W/m²	Xu, Kai		Ultraviolet A
26	Ultraviolet radiation	UV rad	W/m²	Xu, Kai		Ultraviolet B
27	Non photochemical quenching	NPQ		Xu, Kai
28	Non photochemical quenching, standard deviation	NPQ std dev	±	Xu, Kai
29	Salinity	Sal		Xu, Kai
30	Temperature, water	Temp	°C	Xu, Kai
31	Alkalinity, total	AT	µmol/kg	Xu, Kai	Potentiometric titration
32	Alkalinity, total, standard deviation	AT std dev	±	Xu, Kai	Potentiometric titration
33	pH	pH		Xu, Kai	Potentiometric	NBS scale
34	pH, standard deviation	pH std dev	±	Xu, Kai	Potentiometric	NBS scale
35	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
36	pH	pH		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale
37	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
38	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)
39	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)
40	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
41	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
42	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
43	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
44	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:

73874 data points

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