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Effects of pCO2 and iron on the elemental composition and cell geometry of the marine diatom Pseudo-nitzschia pseudodelicatissima (Bacillariophyceae)

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/56198

Title: Effects of pCO2 and iron on the elemental composition and cell geometry of the marine diatom Pseudo-nitzschia pseudodelicatissima (Bacillariophyceae)
Authors: Sugie, Koji Browse this author →KAKEN DB
Yoshimura, Takeshi Browse this author →KAKEN DB
Keywords: Carbon dioxide
Cell size
Diatom
Elemental composition
Iron
Nutrients
Ocean acidification
Issue Date: Jun-2013
Publisher: Phycological Society of America
Journal Title: Journal of Phycology
Volume: 49
Issue: 3
Start Page: 475
End Page: 488
Publisher DOI: 10.1111/jpy.12054
Abstract: Partial pressure of CO2 (pCO2) and iron availability in seawater show corresponding changes due to biological and anthropogenic activities. The simultaneous change in these factors precludes an understanding of their independent effects on the ecophysiology of phytoplankton. In addition, there is a lack of data regarding the interactive effects of these factors on phytoplankton cellular stoichiometry, which is a key driving factor for the biogeochemical cycling of oceanic nutrients. Here, we investigated the effects of pCO2 and iron availability on the elemental composition (C, N, P, and Si) of the diatom Pseudo-nitzschia pseudodelicatissima (Hasle) Hasle by dilute batch cultures under 4 pCO2 (~200, ~380, ~600, and ~800 μatm) and five dissolved inorganic iron (Fe′; ~5, ~10, ~20, ~50, and ~100 pmol · L−1) conditions. Our experimental procedure successfully overcame the problems associated with simultaneous changes in pCO2 and Fe′ by independently manipulating carbonate chemistry and iron speciation, which allowed us to evaluate the individual effects of pCO2 and iron availability. We found that the C:N ratio decreased significantly only with an increase in Fe′, whereas the C:P ratio increased significantly only with an increase in pCO2. Both Si:C and Si:N ratios decreased with increasing pCO2 and Fe′. Our results indicate that changes in pCO2 and iron availability could influence the biogeochemical cycling of nutrients in future oceans with high- CO2 levels, and, similarly, during the time course of phytoplankton blooms. Moreover, pCO2 and iron availability may also have affected oceanic nutrient biogeochemistry in the past, as these conditions have changed markedly over the Earth's history.
Rights: © 2013 Phycological Society of America
Type: article (author version)
URI: http://hdl.handle.net/2115/56198
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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