Citation:

0299

Name: Growth and photosynthesis of a diatom Cylindrotheca closterium grown under elevated CO2 in the presence of solar UV radiation
Published: 2012
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Bottles or small containers/Aquaria (<20 L); Chromista; Cylindrotheca closterium; Growth/Morphology; Laboratory experiment; Laboratory strains; Light; Myzozoa; North Pacific; Ochrophyta; Pelagos; Phytoplankton; Primary production/Photosynthesis; Single species

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Abstract:

The combination of elevated CO2 and the increased acidity in surface oceans is likely to have an impact on photosynthesis via its effects on inorganic carbon speciation and on the overall energetics of phytoplankton. Exposure to UV radiation (UVR) may also have a role in the response to elevated CO2 and acidification, due to the fact that UVR may variously impact on photosynthesis and because of the energy demand of UVR defense. The cell may gain energy by down-regulating the CO2 concentrating mechanism, which may lead to a greater ability to cope with UVR and/or higher growth rates. In order to clarify the interplay of cell responses to increasing CO2 and UVR, we investigated the photosynthetic response of the marine and estuarine diatom Cylindrotheca closterium f. minutissima cultured at either 390 (ambient) or 800 (elevated) ppmv CO2, while exposed to solar radiation with or without UVR (UVR, 280-400 nm). After a 6 day acclimation period, the growth rate of cells was little affected by elevated CO2 and no obvious correlation with the radiation dose (for both PAR and PAR + UV treatments) could be detected. However, the relative electron transport rate was reduced and was more sensitive to UVR in cells main - tained at elevated CO2 as compared to cells cultured at ambient CO2. The CO2 concentrating mechanism was down regulated at 800 ppmv CO2, but was apparently not completely switched off. These data are discussed with respect to their significance in the context of global climate change.

Keyword(s):

Bottles or small containers/Aquaria (<20 L); Chromista; Cylindrotheca closterium; Growth/Morphology; Laboratory experiment; Laboratory strains; Light; Myzozoa; North Pacific; Ochrophyta; Pelagos; Phytoplankton; Primary production/Photosynthesis; Single species

Further details:

Lavigne, Héloïse; Gattuso, Jean-Pierre (2011): seacarb: seawater carbonate chemistry with R. R package version 2.4. 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 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). The date of carbonate chemistry calculation by seacarb is 2013-11-08.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Species	Species		Wu, Xiaojuan
2	Identification	ID		Wu, Xiaojuan
3	Treatment	Treat		Wu, Xiaojuan		PAB-LC=full spectrum of solar radiation+UV and low pCO2, PAB-HC=full spectrum of solar radiation+UV and high pCO2, PAR-LC=solar radiation (400-700 nm) and low pCO2, PAR-HC=solar radiation (400-700 nm) and high pCO2
4	Incubation duration	Inc dur	days	Wu, Xiaojuan
5	Time of day	Time of day		Wu, Xiaojuan
6	Radiation, photosynthetically active, dose daily	PAR dose	MJ/m²/day	Wu, Xiaojuan
7	Ultraviolet-a radiation, dose daily	UV-a dose	kJ/m²/day	Wu, Xiaojuan
8	Ultraviolet-b radiation, dose daily	UV-b dose	kJ/m²/day	Wu, Xiaojuan
9	Growth rate	µ	1/day	Wu, Xiaojuan
10	Growth rate, standard deviation	µ std dev	±	Wu, Xiaojuan
11	Cell density	Cells	#/ml	Wu, Xiaojuan
12	Cell density, standard deviation	Cells std dev	±	Wu, Xiaojuan
13	Effective quantum yield	Y		Wu, Xiaojuan		half range from duplicate cultures
14	Effective quantum yield	Y		Wu, Xiaojuan
15	Maximal electron transport rate, relative	rETR max		Wu, Xiaojuan		half range from duplicate cultures
16	Maximal electron transport rate, relative	rETR max		Wu, Xiaojuan
17	Initial slope of rapid light curve	alpha	µmol electrons/µmol quanta	Wu, Xiaojuan		half range from duplicate cultures
18	Initial slope of rapid light curve	alpha	µmol electrons/µmol quanta	Wu, Xiaojuan
19	Light saturation	Ek	µmol/m²/s	Wu, Xiaojuan		half range from duplicate cultures
20	Light saturation	Ek	µmol/m²/s	Wu, Xiaojuan
21	Maximum potential capacity of photosynthesis	Pmax	µmol/mg/h	Wu, Xiaojuan
22	Maximum potential capacity of photosynthesis, standard deviation	Pmax std dev	±	Wu, Xiaojuan
23	Carbon, inorganic, dissolved, reciprocal of photosynthetic affinity value	DIC K1/2	mmol/l	Wu, Xiaojuan
24	Carbon, inorganic, dissolved, reciprocal of photosynthetic affinity value, standard deviation	DIC K1/2 std dev	±	Wu, Xiaojuan
25	Carbon dioxide, reciprocal of photosynthetic affinity value	CO2 K1/2	µmol/l	Wu, Xiaojuan
26	Carbon dioxide, reciprocal of photosynthetic affinity value, standard deviation	CO2 K1/2 std dev	±	Wu, Xiaojuan
27	Bicarbonate ion, reciprocal of photosynthetic affinity value	[HCO3]- K1/2	µmol/l	Wu, Xiaojuan
28	Bicarbonate ion, reciprocal of photosynthetic affinity value, standard deviation	[HCO3]- K1/2 std dev	±	Wu, Xiaojuan
29	Linear slope, photosynthesis/dissolved organic carbon curve	Beta		Wu, Xiaojuan
30	Linear slope, photosynthesis/dissolved organic carbon curve, standard deviation	Beta std dev	±	Wu, Xiaojuan
31	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Wu, Xiaojuan
32	pH	pH		Wu, Xiaojuan	Potentiometric	NBS
33	pH, standard deviation	pH std dev	±	Wu, Xiaojuan	Potentiometric	NBS
34	Carbon, inorganic, dissolved	DIC	µmol/kg	Wu, Xiaojuan	Calculated
35	Carbon, inorganic, dissolved, standard deviation	DIC std dev	±	Wu, Xiaojuan	Calculated
36	Bicarbonate ion	[HCO3]-	µmol/kg	Wu, Xiaojuan	Calculated
37	Bicarbonate ion, standard deviation	[HCO3]- std dev	±	Wu, Xiaojuan	Calculated
38	Carbonate ion	[CO3]2-	µmol/kg	Wu, Xiaojuan	Calculated
39	Carbonate ion, standard deviation	[CO3]2- std dev	±	Wu, Xiaojuan	Calculated
40	Alkalinity, total	AT	µmol/kg	Wu, Xiaojuan	Calculated
41	Alkalinity, total, standard deviation	AT std dev	±	Wu, Xiaojuan	Calculated
42	Temperature, water	Temp	°C	Wu, Xiaojuan
43	Salinity	Sal		Wu, Xiaojuan
44	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
45	pH	pH		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale
46	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
47	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)
48	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
49	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
50	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
51	Alkalinity, total	AT	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
52	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
53	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:

3736 data points

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