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Enhancement of the reactive iron pool by marine diatoms

Rijkenberg, Micha J.A., Gerringa, Loes J.A., Timmermans, Klaas R., Fischer, Astrid C., Kroon, Koos J., Buma, Anita G.J., Wolterbeek, Bert Th. and de Baar, Hein J.W. (2008) Enhancement of the reactive iron pool by marine diatoms Marine Chemistry, 109, (1-2), pp. 29-44. (doi:10.1016/j.marchem.2007.12.001).

Record type: Article

Abstract

Short term (2 days) laboratory experiments were performed to study the change in irradiance induced production of Fe(II) in
seawater in the presence of two open oceanic Southern Ocean diatom species, Thalassiosira sp. and Chaetoceros brevis. Three irradiance conditions were applied: 1) UVB+UVA+VIS, 2) UVA+VIS, and 3) VIS, and Fe concentrations of 0 and 5 nM Fe were added to natural Southern Ocean seawater (containing 0.32 nM dissolved Fe and 1.69 equivalents of nM L?1 Fe dissolved organic ligands, log K?=22.03). The photoproduced concentration of Fe(II) showed no relationship with the concentration of total dissolved Fe or the concentration of strongly chelated iron. During incubations with the diatoms an increase in the Fe(II) concentration during the second day suggested a modification of the Fe speciation. In the presence of Thalassiosira sp. photoreduction of Fe(III) was observed, whereas in the presence of C. brevis irradiance independent Fe(III) reduction played an important role in the Fe(II) production. Furthermore, a decrease in the strongly chelated Fe concentration, in concert with a decrease in the conditional stability constant, suggested a modification of the strongly chelated Fe fraction in the experiments with C. brevis. The chelated Fe fraction did not change in cultures with Thalassiosira sp. Overall, the presence of diatoms appeared to
enhance the reactive Fe pool improving the biological availability of Fe.

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More information

Submitted date: 3 April 2007
Published date: 16 February 2008
Keywords: photoreduction, phytoplankton, diatoms, iron limitation, bioavailability, climate change, southern ocean

Identifiers

Local EPrints ID: 50855
URI: http://eprints.soton.ac.uk/id/eprint/50855
ISSN: 0304-4203
PURE UUID: e7e8e73d-b6ff-412a-8ac2-ed6113ba37b1

Catalogue record

Date deposited: 09 Apr 2008
Last modified: 17 Jul 2017 14:50

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Contributors

Author: Micha J.A. Rijkenberg
Author: Loes J.A. Gerringa
Author: Klaas R. Timmermans
Author: Astrid C. Fischer
Author: Koos J. Kroon
Author: Anita G.J. Buma
Author: Bert Th. Wolterbeek
Author: Hein J.W. de Baar

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