Citation:

PANGAEA.961012

Name: Seawater carbonate chemistry and photosynthetic performance and N2 fixation in the marine cyanobacterium Trichodesmium
Published: 2023-07-19
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Bacteria; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Cyanobacteria; Growth/Morphology; Laboratory experiment; Laboratory strains; Not applicable; Other metabolic rates; Oxygen; Pelagos; Phytoplankton; Primary production/Photosynthesis; Respiration; Single species; Trichodesmium erythraeum

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Abstract:

Effects of changed levels of dissolved O2 and CO2 on marine primary producers are of general concern with respect to ecological effects of ongoing ocean deoxygenation and acidification as well as upwelled seawaters. We investigated the response of the diazotroph Trichodesmium erythraeum IMS 101 after it had acclimated to lowered pO2 (~60 μM O2) and/or elevated pCO2 levels (HC, ~32 μM CO2) for about 20 generations. Our results showed that reduced O2 levels decreased dark respiration significantly, and increased the net photosynthetic rate by 66 and 89% under the ambient (AC, ~13 μM CO2) and the HC, respectively. The reduced pO2 enhanced the N2 fixation rate by ~139% under AC and only by 44% under HC, respectively. The N2 fixation quotient, the ratio of N2 fixed per O2 evolved, increased by 143% when pO2 decreased by 75% under the elevated pCO2. Meanwhile, particulate organic carbon and nitrogen quota increased simultaneously under reduced O2 levels, regardless of the pCO2 treatments. Nevertheless, changed levels of O2 and CO2 did not bring about significant changes in the specific growth rate of the diazotroph. Such inconsistency was attributed to the daytime positive and nighttime negative effects of both lowered pO2 and elevated pCO2 on the energy supply for growth. Our results suggest that Trichodesmium decrease its dark respiration by 5% and increase its N2-fixation by 49% and N2-fixation quotient by 30% under future ocean deoxygenation and acidification with 16% decline of pO2 and 138% rise of pCO2 by the end of this century.

Keyword(s):

Bacteria; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Cyanobacteria; Growth/Morphology; Laboratory experiment; Laboratory strains; Not applicable; Other metabolic rates; Oxygen; Pelagos; Phytoplankton; Primary production/Photosynthesis; Respiration; Single species; Trichodesmium erythraeum

Supplement to:

Li, He; Gao, Kunshan (2023): Deoxygenation enhances photosynthetic performance and increases N2 fixation in the marine cyanobacterium Trichodesmium under elevated pCO2. Frontiers in Microbiology, 14, 1102909, https://doi.org/10.3389/fmicb.2023.1102909

Documentation:

Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloïse; Orr, James (2019): seacarb: Seawater Carbonate Chemistry. R package version 3.2.15. 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, 2022) 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 2023-07-19.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Type of study	Study type		Gao, Kunshan
2	Species	Species		Gao, Kunshan
3	Treatment	Treat		Gao, Kunshan
4	Replicate	Repl		Gao, Kunshan
5	Growth rate	µ	1/day	Gao, Kunshan
6	Net photosynthesis rate, oxygen, per chlorophyll a	PN O2/Chl a	µmol/µg/h	Gao, Kunshan
7	Respiration rate, oxygen, per chlorophyll a	Resp O2/chl a	µmol/µg/h	Gao, Kunshan
8	Gross photosynthesis rate, oxygen	PG O2	µmol/g/h	Gao, Kunshan		per Chl a
9	Nitrogen fixation rate per chlorophyll a	N2 fix/Chl	nmol/µg/h	Gao, Kunshan
10	Ratio	Ratio		Gao, Kunshan		Nitrogen fixation quotient (N2 fixation/gross O2 evolution)
11	Oxygen	O2	µmol/l	Gao, Kunshan
12	Carbon, organic, particulate per chlorophyll a	POC/Chl a	µmol/mg	Gao, Kunshan
13	Nitrogen, organic, particulate per chlorophyll a	PON/Chl a	µmol/mg	Gao, Kunshan
14	Carbon/Nitrogen ratio	C/N		Gao, Kunshan
15	Particulate organic carbon production, per chlorophyll a	POC prod/Chl a	µmol/µg/day	Gao, Kunshan
16	Particulate organic nitrogen production, per chlorophyll a	PON prod/Chl a	µmol/µg/day	Gao, Kunshan
17	Salinity	Sal		Gao, Kunshan
18	Temperature, water	Temp	°C	Gao, Kunshan
19	Oxygen	O2	µmol/l	Gao, Kunshan		initial
20	Oxygen, standard deviation	O2 std dev	±	Gao, Kunshan		initial
21	pH	pH		Gao, Kunshan		NBS scale, initial
22	pH, standard deviation	pH std dev	±	Gao, Kunshan		NBS scale, initial
23	Alkalinity, total	AT	µmol/l	Gao, Kunshan		Initial
24	Alkalinity, total, standard deviation	AT std dev	±	Gao, Kunshan		Initial
25	Oxygen	O2	µmol/l	Gao, Kunshan		end
26	Oxygen, standard deviation	O2 std dev	±	Gao, Kunshan		end
27	pH	pH		Gao, Kunshan		NBS scale, end
28	pH, standard deviation	pH std dev	±	Gao, Kunshan		NBS scale, end
29	Alkalinity, total	AT	µmol/l	Gao, Kunshan		end
30	Alkalinity, total, standard deviation	AT std dev	±	Gao, Kunshan		end
31	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
32	pH	pH		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale, initial
33	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	initial
34	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)	initial
35	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)	initial
36	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	initial
37	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	initial
38	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	initial
39	Alkalinity, total	AT	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	initial
40	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	initial
41	Calcite saturation state	Omega Cal		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	initial
42	pH	pH		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale, end
43	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	end
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)	end
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)	end
46	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	end
47	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	end
48	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	end
49	Alkalinity, total	AT	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	end
50	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	end
51	Calcite saturation state	Omega Cal		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	end

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

3012 data points

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