Citation:

lno.10161

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Abstract:

Global change leads to a multitude of simultaneous modifications in the marine realm among which shoaling of the upper mixed layer, leading to enhanced surface layer light intensities, as well as increased carbon dioxide (CO2) concentration are some of the most critical environmental alterations for phytoplankton. In this study, we investigated the responses of growth, photosynthetic carbon fixation and calcification of the coccolithophore Gephyrocapsa oceanica to elevated inline image (51 Pa, 105 Pa, and 152 Pa) (1 Pa ~ 10 µatm) at a variety of light intensities (50-800 µmol photons/m**2/s). By fitting the light response curve, our results showed that rising inline image reduced the maximum rates for growth, photosynthetic carbon fixation and calcification. Increasing light intensity enhanced the sensitivity of these rate responses to inline image, and shifted the inline image optima toward lower levels. Combining the results of this and a previous study (Sett et al. 2014) on the same strain indicates that both limiting low inline image and inhibiting high inline image levels (this study) induce similar responses, reducing growth, carbon fixation and calcification rates of G. oceanica. At limiting low light intensities the inline image optima for maximum growth, carbon fixation and calcification are shifted toward higher levels. Interacting effects of simultaneously occurring environmental changes, such as increasing light intensity and ocean acidification, need to be considered when trying to assess metabolic rates of marine phytoplankton under future ocean scenarios.

Project(s):

Biological Impacts of Ocean Acidification (BIOACID)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator
1	Experimental treatment	Exp treat		Zhang, Yong
2	Carbon dioxide, partial pressure	pCO2	Pa	Zhang, Yong
3	Radiation, photosynthetically active	PAR	µmol quanta/m²/s	Zhang, Yong
4	Temperature, water	Temp	°C	Zhang, Yong
5	Light:Dark cycle	L:D	hh:hh	Zhang, Yong
6	Growth rate	µ	1/day	Zhang, Yong
7	Growth rate, standard deviation	µ std dev	±	Zhang, Yong
8	Electron transport rate, relative	rETR	µmol e/m²/s	Zhang, Yong
9	Electron transport rate, relative, standard deviation	rETR std dev	±	Zhang, Yong
10	Initial slope of rapid light curve	alpha	µmol electrons/µmol quanta	Zhang, Yong
11	Initial slope of rapid light curve, standard deviation	alpha std dev	±	Zhang, Yong
12	Light saturation point	Ik		Zhang, Yong
13	Light saturation point, standard deviation	Ik std dev	±	Zhang, Yong
14	Particulate organic carbon production per cell	POC prod/cell	pg/#/day	Zhang, Yong
15	Particulate organic carbon, production, standard deviation	POC prod std dev	±	Zhang, Yong
16	Particulate inorganic carbon production per cell	PIC prod/cell	pg/#/day	Zhang, Yong
17	Particulate inorganic carbon, production, standard deviation	PIC prod std dev	±	Zhang, Yong
18	Particulate inorganic carbon/particulate organic carbon ratio	PIC/POC		Zhang, Yong
19	Particulate inorganic carbon/particulate organic carbon ratio, standard deviation	PIC/POC ratio std dev	±	Zhang, Yong
20	Carbon, organic, particulate/Nitrogen, organic, particulate ratio	POC/PON		Zhang, Yong
21	Carbon, organic, particulate/Nitrogen, organic, particulate ratio, standard deviation	POC/PON std dev	±	Zhang, Yong

License:

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

Size:

378 data points

Data

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

1 Exp treat	2 pCO2 [Pa]	3 PAR [µmol quanta/m²/s]	4 Temp [°C]	5 L:D [hh:hh]	6 µ [1/day]	7 µ std dev [±]	8 rETR [µmol e/m²/s]	9 rETR std dev [±]	10 alpha [µmol electrons/µmol quanta]	11 alpha std dev [±]	12 Ik	13 Ik std dev [±]	14 POC prod/cell [pg/#/day]	15 POC prod std dev [±]	16 PIC prod/cell [pg/#/day]	17 PIC prod std dev [±]	18 PIC/POC	19 PIC/POC ratio std dev [±]	20 POC/PON	21 POC/PON std dev [±]
CO2 51 : light 50	51	50	20	16:08	0.50208	0.00213	321.30625	5.34335	0.29419	0.00310	94.50625	2.29976	8.18169	0.12019	10.79481	0.43710	10.79481	0.43710	1.30288	0.05276
CO2 51 : light 100	51	100	20	16:08	0.71673	0.00274	381.33125	10.66639	0.29037	0.00101	110.66250	2.93900	17.03929	0.67000	23.79193	2.49242	23.79193	2.49242	1.39630	0.14627
CO2 51 : light 200	51	200	20	16:08	1.09228	0.01055	434.37500	6.49465	0.26837	0.00226	116.54375	2.00004	19.50571	0.34272	33.79667	1.67233	33.79667	1.67233	1.73266	0.08574
CO2 51 : light 400	51	400	20	16:08	1.19050	0.01315	539.24375	3.89259	0.26425	0.00445	142.48125	1.71153	33.84502	2.51367	46.57911	4.01866	46.57911	4.01866	1.37625	0.11874
CO2 51 : light 600	51	600	20	16:08	1.20799	0.00595	678.35625	14.46096	0.22581	0.00617	153.47500	2.73061	32.59404	1.02883	52.69162	4.06545	52.69162	4.06545	1.61660	0.12473
CO2 51 : light 800	51	800	20	16:08	1.26065	0.00706	692.32500	10.04409	0.22537	0.00569	156.73750	1.89962	29.47273	0.23369	48.78365	1.37446	48.78365	1.37446	1.65521	0.04664
CO2 105 : light 50	105	50	20	16:08	0.51838	0.00735	315.86250	5.18694	0.29213	0.00209	92.23125	0.88256	7.07546	0.09855	6.96322	0.31073	6.96322	0.31073	0.98414	0.04392
CO2 105 : light 100	105	100	20	16:08	0.78098	0.00374	351.82500	6.26365	0.28719	0.00184	100.98750	1.70496	17.83519	0.72187	17.26503	1.47170	17.26503	1.47170	0.96803	0.08252
CO2 105 : light 200	105	200	20	16:08	0.89680	0.00961	487.31250	8.20044	0.25794	0.00373	125.85000	2.42350	25.81611	3.48369	19.18701	3.57701	19.18701	3.57701	0.74322	0.13856
CO2 105 : light 400	105	400	20	16:08	0.94881	0.00692	643.50625	9.18149	0.24319	0.00316	157.18750	3.43393	28.66189	4.08674	18.70860	4.36674	18.70860	4.36674	0.65273	0.15235
CO2 105 : light 600	105	600	20	16:08	0.88515	0.00819	748.18750	38.44158	0.23931	0.00536	180.19375	9.50323	21.15652	1.98830	23.35232	2.07461	23.35232	2.07461	1.10379	0.09806
CO2 105 : light 800	105	800	20	16:08	0.88043	0.00656	773.08125	70.81234	0.19844	0.01047	155.21875	17.48668	19.88521	1.76533	21.64472	0.95146	21.64472	0.95146	1.11908	0.04919
CO2 152 : light 50	152	50	20	16:08	0.50215	0.01583	294.63125	11.01519	0.28394	0.00333	83.67500	4.03464	8.18857	0.07745	5.54888	2.15655	5.54888	2.15655	0.80915	0.01614
CO2 152 : light 100	152	100	20	16:08	0.63520	0.00837	380.73125	3.79135	0.29037	0.00352	111.66250	1.54899	12.52913	1.10563	7.02669	1.45723	7.02669	1.45723	0.56083	0.11631
CO2 152 : light 200	152	200	20	16:08	0.70244	0.00687	471.23125	13.09205	0.27425	0.00201	129.46250	2.79378	15.52329	2.05430	8.13001	2.25190	8.13001	2.25190	0.52373	0.14507
CO2 152 : light 400	152	400	20	16:08	0.71584	0.00648	654.28125	35.01583	0.26019	0.00553	171.10000	10.23578	12.95907	0.93814	14.01447	1.58472	14.01447	1.58472	1.08144	0.12229
CO2 152 : light 600	152	600	20	16:08	0.68637	0.00575	772.71250	38.68074	0.19569	0.00625	152.78750	7.40502	13.88286	1.46808	10.32834	1.08298	10.32834	1.08298	0.74396	0.07801
CO2 152 : light 800	152	800	20	16:08	0.68802	0.00362	1028.60000	19.63866	0.12263	0.01169	130.39375	11.43377	14.92453	2.45448	13.25782	0.74843	13.25782	0.74843	0.88832	0.05015