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


Zhart, Y and Bach, LT and Schulz, KG and Riebesell, U, The modulating effect of light intensity on the response of the coccolithophore Gephyrocapsa oceanica to ocean acidification, Limnology and Oceanography, 60, (6) pp. 2145-2157. ISSN 0024-3590 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 Association for the Sciences of Limnology and Oceanography

DOI: doi:10.1002/lno.10161


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 urn:x-wiley:00243590:media:lno10161:lno10161-math-0002 (51 Pa, 105 Pa, and 152 Pa) (1 Pa ≈ 10 μatm) at a variety of light intensities (50800 μmol photons m−2 s−1). By fitting the light response curve, our results showed that rising urn:x-wiley:00243590:media:lno10161:lno10161-math-0003 reduced the maximum rates for growth, photosynthetic carbon fixation and calcification. Increasing light intensity enhanced the sensitivity of these rate responses to urn:x-wiley:00243590:media:lno10161:lno10161-math-0004, and shifted the urn:x-wiley:00243590:media:lno10161:lno10161-math-0005 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 urn:x-wiley:00243590:media:lno10161:lno10161-math-0006 and inhibiting high urn:x-wiley:00243590:media:lno10161:lno10161-math-0007 levels (this study) induce similar responses, reducing growth, carbon fixation and calcification rates of G. oceanica. At limiting low light intensities the urn:x-wiley:00243590:media:lno10161:lno10161-math-0008 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.

Item Details

Item Type:Refereed Article
Keywords:phytoplankton, light, climate change, ocean acidification
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Biological oceanography
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Bach, LT (Dr Lennart Bach)
ID Code:133565
Year Published:2015
Web of Science® Times Cited:29
Deposited By:Ecology and Biodiversity
Deposited On:2019-07-02
Last Modified:2019-08-08

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