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Iron enrichment and photoreduction of iron under UV and PAR in the presence of hydroxycarboxylic acid: Implications for phytoplankton growth in the Southern Ocean
Trondheim Biological Station, Norwegian Univ. of Sci. and Technol., Bynesvagen 46, N-7018 Trondheim, N..
Department of Chemistry, Analytical and Marine Chemistry, Goteborg Univ., SE-412 96 G..
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Dept. of Chemistry and Bioscience, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
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2004 (English)In: Deep-sea research. Part II, Topical studies in oceanography, ISSN 0967-0645, Vol. 51, no 22-24, 2841-2856 p.Article in journal (Refereed) Published
Abstract [en]

Iron(III) photoreduction and the responses of phytoplankton under ultraviolet (UV) and photosynthetically available radiation (PAR) were investigated with the presence of hydroxycarboxylic acid (glucaric acid (GA), a model compound for organic acids excreted by phytoplankton). The incubation experiments were carried out on board using seawater samples collected in the location of the winter ice edge (WIE) and the spring ice edge (SIE) of the Southern Ocean. In this paper, we focus on the results of experiment in WIE. Throughout the experiments, dissolved Fe(II), major nutrients and in vivo fluorescence were monitored regularly. In addition, Chl-a, POC/PON, cell densities of phytoplankton and bacteria, bacterial production, organic peroxide, hydrogen peroxide and total CO2 were measured. The results from the WIE show that iron enrichment had a substantial effect on phytoplankton growth rate. Fe(III) addition in the presence of GA (FeGA) gave higher Fe(II) concentration and higher growth rate of phytoplankton than those in controls. Our results suggest that hydroxycarboxylic acid had a significant chemical and biological impact. The presence of GA influenced iron photochemistry and iron availability to phytoplankton. Phytoplankton growth responses to iron enrichments in incubations under UV and PAR were completely dissimilar. It seems that FeGA addition prominently changes the harmful effect of UV on the phytoplankton population. This study provides preliminary information on how the photoreduction of iron(III) and the phytoplankton growth are affected by iron enrichment in the presence of hydroxycarboxylic acid. © 2004 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2004. Vol. 51, no 22-24, 2841-2856 p.
National Category
Social Sciences
URN: urn:nbn:se:liu:diva-45580DOI: 10.1016/j.dsr2.2000.10.001OAI: diva2:266476
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2012-01-07

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Department of Water and Environmental StudiesFaculty of Arts and Sciences
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Deep-sea research. Part II, Topical studies in oceanography
Social Sciences

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