Citation:

bg-9-3931-2012

Name: Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum
Published: 2012
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Bottles or small containers/Aquaria (<20 L); Chromista; Laboratory experiment; Laboratory strains; Light; North Pacific; Ochrophyta; Pelagos; Phaeodactylum tricornutum; Primary production/Photosynthesis; Single species; Temperature

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Abstract:

Increasing atmospheric CO2 concentration is responsible for progressive ocean acidification, ocean warming as well as decreased thickness of upper mixing layer (UML), thus exposing phytoplankton cells not only to lower pH and higher temperatures but also to higher levels of solar UV radiation. In order to evaluate the combined effects of ocean acidification, UV radiation and temperature, we used the diatom Phaeodactylum tricornutum as a model organism and examined its physiological performance after grown under two CO2 concentrations (390 and 1000 µatm) for more than 20 generations. Compared to the ambient CO2 level (390 µatm), growth at the elevated CO2 concentration increased non-photochemical quenching (NPQ) of cells and partially counteracted the harm to PS II (photosystem II) caused by UV-A and UV-B. Such an effect was less pronounced under increased temperature levels. The ratio of repair to UV-B induced damage decreased with increased NPQ, reflecting induction of NPQ when repair dropped behind the damage, and it was higher under the ocean acidification condition, showing that the increased pCO2 and lowered pH counteracted UV-B induced harm. As for photosynthetic carbon fixation rate which increased with increasing temperature from 15 to 25 °C, the elevated CO2 and temperature levels synergistically interacted to reduce the inhibition caused by UV-B and thus increase the carbon fixation.

Keyword(s):

Bottles or small containers/Aquaria (<20 L); Chromista; Laboratory experiment; Laboratory strains; Light; North Pacific; Ochrophyta; Pelagos; Phaeodactylum tricornutum; Primary production/Photosynthesis; Single species; Temperature

Further details:

Lavigne, Héloïse; Gattuso, Jean-Pierre (2011): seacarb: seawater carbonate chemistry with R. R package version 2.4 [webpage]. 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 2013-11-15.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Species	Species		Li, Yahe
2	Identification	ID		Li, Yahe
3	Temperature, water	Temp	°C	Li, Yahe
4	Treatment	Treat		Li, Yahe		PAB=PAR+UVA+UVB, PA=PAR+UVA, P=PAR (400-700 nm), UVA (315-400 nm), UVB (280-315 nm), UVR (280-400 nm); HC=high pCO2, LC=low pCO2
5	Time in minutes	Time	min	Li, Yahe		exposure time
6	Effective quantum yield	Y		Li, Yahe
7	Damage rate	k	1/min	Li, Yahe
8	Damage rate, standard deviation	k std dev	±	Li, Yahe
9	Repair rate	r	1/min	Li, Yahe
10	Repair rate, standard deviation	r std dev	±	Li, Yahe
11	Non photochemical quenching	NPQ		Li, Yahe
12	Non photochemical quenching, standard deviation	NPQ std dev	±	Li, Yahe
13	Damage/repair ratio	k/r		Li, Yahe
14	Damage/repair ratio, standard deviation	k/r standard deviation	±	Li, Yahe
15	Time in minutes	Time	min	Li, Yahe		recovery time
16	Net photosynthesis rate, per cell	PN/cell	pg/#/h	Li, Yahe
17	Net photosynthesis rate, standard deviation	PN std dev	±	Li, Yahe
18	Ultraviolet radiation-induced inhibition of photosynthesis	UVR-induced inhibition of PN	%	Li, Yahe
19	Ultraviolet radiation-induced inhibition of photosynthesis, standard deviation	UVR-induced inhibition of PN std dev	±	Li, Yahe
20	Temperature, water	Temp	°C	Li, Yahe
21	Salinity	Sal		Li, Yahe
22	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Li, Yahe
23	pH	pH		Li, Yahe	Potentiometric	NBS scale
24	pH, standard deviation	pH std dev	±	Li, Yahe	Potentiometric	NBS scale
25	Carbon, inorganic, dissolved	DIC	µmol/kg	Li, Yahe	Calculated using CO2SYS
26	Carbon, inorganic, dissolved, standard deviation	DIC std dev	±	Li, Yahe	Calculated using CO2SYS
27	Bicarbonate ion	[HCO3]-	µmol/kg	Li, Yahe	Calculated using CO2SYS
28	Bicarbonate ion, standard deviation	[HCO3]- std dev	±	Li, Yahe	Calculated using CO2SYS
29	Carbonate ion	[CO3]2-	µmol/kg	Li, Yahe	Calculated using CO2SYS
30	Carbonate ion, standard deviation	[CO3]2- std dev	±	Li, Yahe	Calculated using CO2SYS
31	Carbon dioxide	CO2	µmol/kg	Li, Yahe	Calculated using CO2SYS
32	Alkalinity, total	AT	µmol/kg	Li, Yahe	Calculated using CO2SYS
33	Alkalinity, total, standard deviation	AT std dev	±	Li, Yahe	Calculated using CO2SYS
34	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
35	pH	pH		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale
36	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
37	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)
38	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
39	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
40	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
41	Alkalinity, total	AT	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
42	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
43	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:

41489 data points

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