Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/bg-2017-76
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
14 Mar 2017
Review status
This discussion paper is under review for the journal Biogeosciences (BG).
Differential photosynthetic response of marine planktonic and benthic diatoms to ultraviolet radiation under various temperature regimes
Yaping Wu1, Furong Yue2, Juntian Xu2, and John Beardall3 1College of Oceanography, Hohai University, Nanjing, 210098, China
2College of Marine Life and Fisheries, Huaihai Institute of Technology, Lianyungang, 222005, China
3School of Biological Sciences, Monash University, Clayton, Victoria 3800, Australia
Abstract. We studied the photophysiological response to ultraviolet radiation (UVR) of two diatoms, isolated from different environmental niches. Both species showed the highest sensitivity to UV radiation under relatively low temperature, while they were less inhibited under moderately increased temperature. Under the highest temperature applied in this study, the benthic diatom Nitzschia sp. showed minimal sensitivity to UV radiation, while inhibition of the planktonic species, Skeletonema sp., increased further compared with that at the growth temperature. These photochemical responses were linked to values for the repair and damage processes within the cell; higher damage rates and lower repair rates were observed for Skeletonema sp. under suboptimal temperature, while for Nitzschia sp., repair rates increased and damage rates were stable within the applied temperature range. Our results suggested that the response of phytoplankton to UV radiation correlated with their niche environments, the periodic exposure to extreme temperature promote the resistance of benthic species to the combination of high temperature and UV radiation. Furthermore, the temperature-mediated UV sensitivities might also have implications for phytoplankton in the future warming oceans.

Citation: Wu, Y., Yue, F., Xu, J., and Beardall, J.: Differential photosynthetic response of marine planktonic and benthic diatoms to ultraviolet radiation under various temperature regimes, Biogeosciences Discuss., doi:10.5194/bg-2017-76, in review, 2017.
Yaping Wu et al.
Yaping Wu et al.
Yaping Wu et al.

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Short summary
We studied the photophysiological response to ultraviolet radiation (UVR) of two diatoms, our results show that: The response of diatoms to UV is correlated with their niches. Moderately increased temperature help diatoms to counteract with UV. Benthic species performed better in response to UV under extreme temperature regime.
We studied the photophysiological response to ultraviolet radiation (UVR) of two diatoms, our...
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