HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Availability of iron and major nutrients for phytoplankton in the northeast Atlantic Ocean

Abstract : Because of recent findings that Fe is a limiting factor for phytoplankton activity even at relatively high dissolved iron (DFe) concentrations, the potential importance of Fe limitation was revisited in the northeast Atlantic Ocean (39-458N, 17-218W). We report data gathered during deck incubation experiments performed at three stations in February-March 2001 with surface seawater containing DFe concentrations of ;0.40 nmol L21. At all stations, Fe addition enhanced phytoplankton growth. Fe limitation was moderate and occurred simultaneously with limitation by major nutrients. This was clearly demonstrated for diatoms that were colimited by orthosilicic acid. Micro-, nano-, and picoplankton benefited from Fe enrichment. Experiments performed with the trihydroxamate siderophore desferrioxamine mesylate B (DFOB) indicated that Fe reserves exist within the cells, especially within the larger cells. This reserve could result from luxurious storage of Fe by colimited cells during episodic atmospheric deposition of Saharan dust. Simulating concentrations of dust resulting from aerosol deposition in well-stratified surface waters, we determined that the solubility of Saharan dust was very low (,0.1% w/w) but the amount of DFe released in seawater was sufficient to relieve the Fe limitation of the ambient phytoplankton community.
Document type :
Journal articles
Complete list of metadata

Cited literature [30 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-00702539
Contributor : Karine Leblanc Connect in order to contact the contributor
Submitted on : Wednesday, May 30, 2012 - 3:31:41 PM
Last modification on : Tuesday, May 10, 2022 - 3:25:39 PM
Long-term archiving on: : Friday, August 31, 2012 - 2:22:59 AM

File

Blain_2004.pdf
Publisher files allowed on an open archive

Identifiers

Citation

Stéphane Blain, Cécile Guieu, Hervé Claustre, Karine Leblanc, T. Moutin, et al.. Availability of iron and major nutrients for phytoplankton in the northeast Atlantic Ocean. Limnology and Oceanography, Association for the Sciences of Limnology and Oceanography, 2004, 49 (6), pp.2095-2104. ⟨10.4319/lo.2004.49.6.2095⟩. ⟨hal-00702539⟩

Share

Metrics

Record views

584

Files downloads

478