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Wu, YaPing; Gao, Kunshan (2010): Combined effects of solar UV radiation and CO2-induced seawater acidification on photosynthetic carbon fixation of phytoplankton assemblages in the South China Sea, 2010 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.758222, Supplement to: Wu, YP; Gao, K (2010): Combined effects of solar UV radiation and CO2-induced seawater acidification on photosynthetic carbon fixation of phytoplankton assemblages in the South China Sea. Chinese Science Bulletin, 55(32), 3680-3686, https://doi.org/10.1007/s11434-010-4119-y

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Published: 2010 (exact date unknown) • DOI registered: 2011-04-08

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Abstract:
We carried out short term pCO2/pH perturbation experiments in the coastal waters of the South China Sea to evaluate the combined effects of seawater acidification (low pH/high pCO2) and solar UV radiation (UVR, 280-400 nm) on photosynthetic carbon fixation of phytoplankton assemblages. Under photosynthetically active radiation (PAR) alone treatments, reduced pCO2 (190 ppmv) with increased pH resulted in a significant decrease in the photosynthetic carbon fixation rate (about 23%), while enriched pCO2 (700 ppmv) with lowered pH had no significant effect on the photosynthetic performance compared to the ambient level. The apparent photosynthetic efficiency decreased under the reduced pCO2 level, probably due to C-limitation as well as energy being diverged for up-regulation of carbon concentrating mechanisms (CCMs). In the presence of UVR, both UV-A and UV-B caused photosynthetic inhibition, though UV-A appeared to enhance the photosynthetic efficiency under lower PAR levels. UV-B caused less inhibition of photosynthesis under the reduced pCO2 level, probably because of its contribution to the inorganic carbon (Ci)-acquisition processes. Under the seawater acidification conditions (enriched pCO2), both UV-A and UV-B reduced the photosynthetic carbon fixation to higher extents compared to the ambient pCO2 conditions. We conclude that solar UV and seawater acidification could synergistically inhibit photosynthesis.
Keyword(s):
Bottles or small containers/Aquaria (<20 L); Coast and continental shelf; Entire community; Laboratory experiment; Light; North Pacific; Pelagos; Phytoplankton; Primary production/Photosynthesis; Temperate
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
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
3 datasets

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Datasets listed in this publication series

  1. Wu, YP; Gao, K (2010): Seawater carbonate chemistry, chlorophyll a and photosynthetic carbon fixation rate under different light and pCO2 conditions during experiments, 2010. https://doi.org/10.1594/PANGAEA.758215
  2. Wu, YP; Gao, K (2010): Mean photosynthetic carbon fixation rate under P, PA and PAB treatments in the seawater equilibrated with 190, 380 and 700 ppmv CO2 and the mean relative inhibition caused by UVR, UV-A and UV-B, 2010. https://doi.org/10.1594/PANGAEA.758220
  3. Wu, YP; Gao, K (2010): Photosynthetic carbon fixation rate in the seawater equilibrated with 190, 380 and 700 ppmv CO2, as a function of the mean PAR irradiance under P and PAB, 2010. https://doi.org/10.1594/PANGAEA.758221