Citation:

2006GB002898

Name: Seawater carbonate chemistry and particulate organic particles during a semicontinuous batch culture experiment with Trichodesmium IMS101, 2007
Published: 2007
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Bacteria; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Cyanobacteria; Laboratory experiment; Not applicable; Other metabolic rates; Pelagos; Phytoplankton; Single species; Trichodesmium sp.

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Abstract:

Diazotrophic (N2-fixing) cyanobacteria provide the biological source of new nitrogen for large parts of the ocean. However, little is known about their sensitivity to global change. Here we show that the single most important nitrogen fixer in today's ocean, Trichodesmium, is strongly affected by changes in CO2 concentrations. Cell division rate doubled with rising CO2 (glacial to projected year 2100 levels) prompting lower carbon, nitrogen and phosphorus cellular contents, and reduced cell dimensions. N2 fixation rates per unit of phosphorus utilization as well as C:P and N:P ratios more than doubled at high CO2, with no change in C:N ratios. This could enhance the productivity of N-limited oligotrophic oceans, drive some of these areas into P limitation, and increase biological carbon sequestration in the ocean. The observed CO2 sensitivity of Trichodesmium could thereby provide a strong negative feedback to atmospheric CO2 increase.

Keyword(s):

Bacteria; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Cyanobacteria; Laboratory experiment; Not applicable; Other metabolic rates; Pelagos; Phytoplankton; Single species; Trichodesmium sp.

Project(s):

European network of excellence for Ocean Ecosystems Analysis (EUR-OCEANS)

European Project on Ocean Acidification (EPOCA)

Ocean Acidification International Coordination Centre (OA-ICC)

Funding:

Seventh Framework Programme (FP7), grant/award no. 211384 : European Project on Ocean Acidification

Sixth Framework Programme (FP6), grant/award no. 511106 : European network of excellence for Ocean Ecosystems Analysis

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).

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Experimental treatment	Exp treat		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
2	Salinity	Sal		Barcelos e Ramos, Joana
3	Temperature, water	Temp	°C	Barcelos e Ramos, Joana
4	Carbonate system computation flag	CSC flag		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
5	pH	pH		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)	Total scale
6	Alkalinity, total	AT	µmol/kg	Barcelos e Ramos, Joana	Titration potentiometric, 794 Basic Titrino (Metrohm)
7	Carbon, inorganic, dissolved	DIC	µmol/kg	Barcelos e Ramos, Joana	Automated segmented-flow analyzer (Quaatro)
8	Carbon dioxide	CO2	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
9	Carbonate ion	[CO3]2-	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
10	Bicarbonate ion	[HCO3]-	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
11	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
12	Fugacity of carbon dioxide (water) at sea surface temperature (wet air)	fCO2water_SST_wet	µatm	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
13	Aragonite saturation state	Omega Arg		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
14	Calcite saturation state	Omega Cal		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
15	Carbon, organic, particulate	POC	µmol/l	Barcelos e Ramos, Joana	Gas chromatography (EURO EA Elemental Analyser, EUROVECTOR)
16	Nitrogen, organic, particulate	PON	µmol/l	Barcelos e Ramos, Joana	Gas chromatography (EURO EA Elemental Analyser, EUROVECTOR)
17	Phosphorus, organic, particulate	POP	µmol/l	Barcelos e Ramos, Joana	Spectrophotometry
18	Nitrogen fixation rate, per cell	N2 fix/cell	fmol/#/h	Barcelos e Ramos, Joana	Determined by acetylene reduction assay using a gas chromatograph
19	Chlorophyll a per cell	Chl a/cell	pg/#	Barcelos e Ramos, Joana	Measured
20	Nitrogen per cell	N/cell	pmol/#	Barcelos e Ramos, Joana
21	Carbon per cell	C/cell	pmol/#	Barcelos e Ramos, Joana
22	Phosphate per cell	PO4/cell	pmol/#	Barcelos e Ramos, Joana
23	Trichodesmium cells	Trichod cells	#/l	Barcelos e Ramos, Joana	Counting

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

414 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Exp treat	2 Sal	3 Temp [°C]	4 CSC flag	5 pH	6 AT [µmol/kg]	7 DIC [µmol/kg]	8 CO2 [µmol/kg]	9 [CO3]2- [µmol/kg]	10 [HCO3]- [µmol/kg]	11 pCO2water_SST_wet [µatm]	12 fCO2water_SST_wet [µatm]	13 Omega Arg	14 Omega Cal	15 POC [µmol/l]	16 PON [µmol/l]	17 POP [µmol/l]	18 N2 fix/cell [fmol/#/h]	19 Chl a/cell [pg/#]	20 N/cell [pmol/#]	21 C/cell [pmol/#]	22 PO4/cell [pmol/#]	23 Trichod cells [#/l]
pCO2 treatment 1	35	25	15	8.47	2947.6	2189.7	3.96	566.570	1619.140	139.38	138.94	8.99	13.63	56.74	10.66	0.88	0.81	9.91	0.366	1.948	0.030	29125111
pCO2 treatment 2	35	25	15	8.48	3398.1	2534.2	4.41	669.671	1860.072	155.45	154.96	10.62	16.11	56.40	10.59	0.69	2.14	5.38	1.644	8.750	0.107	6445051
pCO2 treatment 3	35	25	15	8.43	2907.8	2194.5	4.42	532.447	1657.684	155.54	155.05	8.44	12.81	57.52	10.43	0.86	1.91	9.20	0.837	4.619	0.069	12452663
pCO2 treatment 4	35	25	15	8.32	2728.6	2147.4	5.89	429.561	1711.960	207.43	206.78	6.81	10.34	99.98	19.10	1.39	1.84	17.44	0.469	2.456	0.034	40707896
pCO2 treatment 5	35	25	15	8.30	3205.3	2568.5	7.43	492.352	2068.720	261.85	261.03	7.81	11.85	84.10	16.15	1.00	3.39	14.01	1.273	6.628	0.079	12689427
pCO2 treatment 6	35	25	15	8.23	2670.4	2175.6	7.58	366.453	1801.559	266.90	266.06	5.81	8.82	66.33	13.06	0.75	2.53	10.93	0.739	3.751	0.042	17683045
pCO2 treatment 7	35	25	15	8.20	3130.9	2599.6	9.83	412.133	2177.679	346.34	345.25	6.54	9.92	110.87	20.94	1.11	3.07	18.60	0.909	4.812	0.048	23039639
pCO2 treatment 8	35	25	15	8.11	2499.3	2112.0	10.51	285.402	1816.109	370.34	369.18	4.53	6.87	186.27	35.31	2.23	2.54	33.69	0.718	3.789	0.045	49161552
pCO2 treatment 9	35	25	15	8.09	2526.8	2155.7	10.99	275.360	1869.344	387.00	385.78	4.37	6.63	106.50	21.17	1.09	4.37	19.17	0.867	4.362	0.045	24411822
pCO2 treatment 10	35	25	15	8.12	2901.9	2470.5	11.80	331.631	2127.078	415.52	414.22	5.26	7.98	198.82	38.48	1.85	1.26	33.41	0.421	2.177	0.020	91344689
pCO2 treatment 11	35	25	15	8.12	3013.0	2564.5	11.98	347.897	2204.615	421.82	420.49	5.52	8.37	129.12	25.67	1.25	2.31	21.04	0.900	4.525	0.044	28533844
pCO2 treatment 12	35	25	15	8.03	2450.2	2123.3	12.73	242.867	1867.671	448.22	446.81	3.85	5.84	134.63	24.72	1.38	1.41	22.65	0.448	2.439	0.025	55191767
pCO2 treatment 13	35	25	15	8.00	2462.6	2155.6	13.71	229.874	1912.032	483.06	481.54	3.65	5.53	80.44	15.75	0.89	2.40	3.64	0.638	3.261	0.036	24664090
pCO2 treatment 14	35	25	15	7.98	2336.9	2050.5	14.31	212.155	1823.998	504.16	502.58	3.36	5.10	186.13	34.10	1.97	2.49	32.84	0.580	3.164	0.034	58822517
pCO2 treatment 15	35	25	15	7.96	2411.0	2135.8	15.51	207.242	1913.028	546.18	544.46	3.29	4.99	114.75	22.48	1.12	2.23	15.17	0.565	2.883	0.028	39809503
pCO2 treatment 16	35	25	15	7.96	2378.1	2099.2	15.56	208.940	1874.707	548.05	546.33	3.31	5.03	153.88	28.43	1.79	0.97	26.84	0.326	1.764	0.021	87216787
pCO2 treatment 17	35	25	15	7.98	2810.7	2487.3	16.82	253.107	2217.370	592.33	590.47	4.01	6.09	136.54	26.85	1.02	1.41	23.39	0.414	2.105	0.016	64877825
pCO2 treatment 18	35	25	15	7.78	2352.6	2175.3	24.11	143.091	2008.095	849.28	846.61	2.27	3.44	111.38	21.86	1.06	1.64	20.95	0.311	1.585	0.015	70290238