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Free Content Photochemical iron reduction and iron bioavailability in seawater

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Photochemical redox cycling of iron in natural seawater may affect the availability of iron to phytoplankton for cellular growth. Fe(III) colloids that support only limited phytoplankton growth were added to coastal seawater at pH8 and exposed to simulated solar irradiation for varied time intervals. Photo-production of Fe(II) in the seawater samples was measured during each irradiation. Following irradiation, the marine diatom, Skeletonema costatum, was inoculated into each treatment and cell densities were monitored in batch cultures over the next ten days. Increases in steady state concentrations of Fe(II) were observed during irradiation and subsequent elevated phytoplankton growth was observed in most solutions exposed for 60 minutes or more. The photo-production of Fe(II) in seawater results in the transfer of iron between chemical states which differ in their ability to supply iron on a time scale required for phytoplankton growth.

Document Type: Research Article

DOI: http://dx.doi.org/10.1357/0022240943077136

Publication date: March 1, 1994

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  • The Journal of Marine Research publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. In the area of biology, studies involving coupling between ecological and physical processes are preferred over those that report systematics. Authors benefit from thorough reviews of their manuscripts, where an attempt is made to maximize clarity. The time between submission and publication is kept to a minimum; there is no page charge.
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