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Synergistic effects of pCO2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community

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Title: Synergistic effects of pCO2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community
Authors: Sugie, Koji Browse this author →KAKEN DB
Endo, Hisashi Browse this author
Suzuki, Koji Browse this author →KAKEN DB
Nishioka, Jun Browse this author →KAKEN DB
Kiyosawa, Hiroshi Browse this author
Yoshimura, Takeshi Browse this author →KAKEN DB
Issue Date: 7-Oct-2013
Publisher: Copernicus Gesellschaft mbh
Journal Title: Biogeosciences
Volume: 10
Issue: 10
Start Page: 6309
End Page: 6321
Publisher DOI: 10.5194/bg-10-6309-2013
Abstract: Little is known concerning the effect of CO2 on phytoplankton ecophysiological processes under nutrient and trace element-limited conditions, because most CO2 manipulation experiments have been conducted under elements-replete conditions. To investigate the effects of CO2 and iron availability on phytoplankton ecophysiology, we conducted an experiment in September 2009 using a phytoplankton community in the iron limited, high-nutrient, low-chlorophyll (HNLC) region of the Bering Sea basin. Carbonate chemistry was controlled by the bubbling of the several levels of CO2 concentration (180, 380, 600, and 1000 ppm) controlled air, and two iron conditions were established, one with and one without the addition of inorganic iron. We demonstrated that in the iron-limited control conditions, the specific growth rate and the maximum photochemical quantum efficiency (F-v/F-m) of photosystem (PS) II decreased with increasing CO2 levels, suggesting a further decrease in iron bioavailability under the high-CO2 conditions. In addition, biogenic silica to particulate nitrogen and biogenic silica to particulate organic carbon ratios increased from 2.65 to 3.75 and 0.39 to 0.50, respectively, with an increase in the CO2 level in the iron-limited controls. By contrast, the specific growth rate, F-v/F-m values and elemental compositions in the iron-added treatments did not change in response to the CO2 variations, indicating that the addition of iron canceled out the effect of the modulation of iron bioavailability due to the change in carbonate chemistry. Our results suggest that high-CO2 conditions can alter the biogeochemical cycling of nutrients through decreasing iron bioavailability in the iron-limited HNLC regions in the future.
Rights: © Author(s) 2013. This work is distributedunder the Creative Commons Attribution 3.0 License.
Type: article
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 杉江 恒二

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