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OA Thwarts Negative Effects of Ultraviolet Radiation on a Diatom

Paper Reviewed
Chen, H., Guan, W., Zeng, G., Li, P. and Chen, S. 2015. Alleviation of solar ultraviolet radiation (UVR)-induced photo-inhibition in diatom Chaetoceros curvisetus by ocean acidification. Journal of the Marine Biological Association of the United Kingdom 95: 661-667.

Working with the marine planktonic diatom Chaetoceros curvisetus -- one of the more than 400 species that comprise the huge genera -- Chen et al. (2015) studied the effects of unusually high CO2 (HC = 1,000 ppm) and normally low CO2 (LC = 380 ppm) on several of the species' growth characteristics over a period of 14 days, after which the acclimated cells of both CO2 treatments were exposed to higher-than-normal solar ultraviolet radiation and the effects of this treatment were assessed.

Results indicated, in the words of the five Chinese scientists who conducted the research, that "ocean acidification appeared to inhibit the UVR-induced photo-inhibition in C. curvisetus cells," which finding, they additionally note, is "consistent with previous research on P. tricornutum (Li et al., 2012) and Nannochloropsis gaditana (Sobrino et al., 2005)."

And so we discover yet another positive impact of CO2-induced ocean acidification on Earth's marine life in which the "harmful effects of UVR on C. curvisetus could be counteracted."

Li, Y., Gao, K., Villafañe, V. and Helbling, E. 2012. Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum. Biogeosciences Discussions 9: 7197-7226.

Sobrino, C., Neale, P.J. and Lubian, L.M. 2005. Interaction of UV radiation and inorganic carbon supply in the inhibition of photosynthesis: spectral and temporal responses of two marine picoplankters. Photochemistry and Photobiology 81: 384-393.

Posted 21 August 2015