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

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