The modulating effect of light intensity on the response of the coccolithophore Gephyrocapsa oceanicato ocean acidification

Zhang, Yong, Bach, Lennart T., Schulz, Kai G. and Riebesell, Ulf (2015) The modulating effect of light intensity on the response of the coccolithophore Gephyrocapsa oceanicato ocean acidification Limnology and Oceanography, 60 (6). pp. 2145-2157. DOI 10.1002/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−1). 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.

Document Type: Article
Additional Information: WOS:000363888400021
Keywords: EMILIANIA-HUXLEYI; MARINE-PHYTOPLANKTON; CO2-CONCENTRATING MECHANISM; NUTRIENT-LIMITATION; CARBONATE CHEMISTRY; CO2; TEMPERATURE; GROWTH; ACCLIMATION; IRRADIANCE
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Refereed: Yes
DOI etc.: 10.1002/lno.10161
ISSN: 0024-3590
Projects: BIOACID
Date Deposited: 10 Nov 2015 08:23
Last Modified: 27 Nov 2015 09:47
URI: http://oceanrep.geomar.de/id/eprint/30194

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