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

Stéphane Blain, Cecile Guieu, Hervé Claustre, Karine Leblanc, Thierry Moutin, Bernard Quéguiner, Joséphine Ras, Géraldine Sarthou

Research output: Contribution to journalArticle

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 (39-45°N, 17-21°W). 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 L-1. 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.

Original languageEnglish (US)
Pages (from-to)2095-2104
Number of pages10
JournalLimnology and Oceanography
Volume49
Issue number6
DOIs
StatePublished - Jan 1 2004

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Atlantic Ocean
dust
phytoplankton
iron
nutrient
nutrients
ocean
seawater
deferoxamine
siderophore
picoplankton
Bacillariophyceae
atmospheric deposition
siderophores
nanoplankton
cells
aerosols
limiting factor
solubility
surface water

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

Cite this

Blain, S., Guieu, C., Claustre, H., Leblanc, K., Moutin, T., Quéguiner, B., ... Sarthou, G. (2004). Availability of iron and major nutrients for phytoplankton in the northeast Atlantic Ocean. Limnology and Oceanography, 49(6), 2095-2104. https://doi.org/10.4319/lo.2004.49.6.2095

Availability of iron and major nutrients for phytoplankton in the northeast Atlantic Ocean. / Blain, Stéphane; Guieu, Cecile; Claustre, Hervé; Leblanc, Karine; Moutin, Thierry; Quéguiner, Bernard; Ras, Joséphine; Sarthou, Géraldine.

In: Limnology and Oceanography, Vol. 49, No. 6, 01.01.2004, p. 2095-2104.

Research output: Contribution to journalArticle

Blain, S, Guieu, C, Claustre, H, Leblanc, K, Moutin, T, Quéguiner, B, Ras, J & Sarthou, G 2004, 'Availability of iron and major nutrients for phytoplankton in the northeast Atlantic Ocean', Limnology and Oceanography, vol. 49, no. 6, pp. 2095-2104. https://doi.org/10.4319/lo.2004.49.6.2095
Blain, Stéphane ; Guieu, Cecile ; Claustre, Hervé ; Leblanc, Karine ; Moutin, Thierry ; Quéguiner, Bernard ; Ras, Joséphine ; Sarthou, Géraldine. / Availability of iron and major nutrients for phytoplankton in the northeast Atlantic Ocean. In: Limnology and Oceanography. 2004 ; Vol. 49, No. 6. pp. 2095-2104.
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