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Title

Luxury uptake of aerosol iron by Trichodesmium in the western tropical North Atlantic

AuthorsChen, Ying; Tovar-Sánchez, Antonio ; Siefert, Ronald L.; Sañudo-Wilhelmy, Sergio A.; Zhuang, Guoshun
Issue Date2011
PublisherAmerican Geophysical Union
CitationGeophysical Research Letteres 38 (2011)
AbstractDust transported from North Africa carries micronutrient iron (Fe) to the western tropical North Atlantic (WTNA) which may significantly influence the metabolism of the N2-fixing cyanobacteria, Trichodesmium. For the first time, we conducted shipboard incubation experiments using freshly collected aerosol, seawater, and Trichodesmium colonies. Trichodesmium assimilated significant amount of aerosol Fe up to 14 times higher than the control. The uptake amount increased proportionally to the P: Fe ratio that Trichodesmium initially contained and to the aerosol Fe added and leached to the incubation solution. Trichodesmium assimilated more aerosol Fe than needed for its maximum growth (0.14 d-1) demonstrating a high capacity of luxury uptake of Fe from the dust. Copyright 2011 by the American Geophysical Union.
URIhttp://hdl.handle.net/10261/58639
DOI10.1029/2011GL048972
Identifiersdoi: 10.1029/2011GL048972
issn: 0094-8276
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