Effect of atmospheric nutrients on the autotrophic communities in a low nutrient, low chlorophyll system

Sophie Bonnet, Cecile Guieu, Jacques Chiaverini, Joséphine Ras, Agnès Stock

    Research output: Contribution to journalArticle

    Abstract

    The effect of atmospheric inputs on phytoplanktonic dynamics was investigated in the Mediterranean Sea during the season characterized by a stratified water column, low primary productivity, and low concentrations of nutrients ([nitrate] < 50 nmol L-1; [phosphate] = 20 nmol L -1; [silicate] = 0.7 μmol L-1). We report here data obtained during microcosm enrichment experiments performed on the natural assemblage using different combinations of realistic additions (Saharan dust, Fe, Fe + phosphate, and anthropogenic particles). Saharan dust and Fe + phosphate treatments significantly stimulated primary production. Anthropogenic particles and Fe + phosphate treatments increased the chlorophyll a concentrations, enhancing mainly the small cells (pico- and nanophytoplankton). The autotrophic community structure was significantly altered; for example, Fe and Fe + phosphate additions benefited prokaryotic populations, indicating possible nitrogen fixation. The colimitation of both phosphate and Fe was removed by these additions. Results emphasized the effect of Fe, although the ambient concentration was close to 1 nmol L-1. The addition of dust benefited eukaryotic populations, which indicates that the dust was a possible source of nitrogen. An abiotic dissolution experiment of macronutrients attached to dust confirmed this hypothesis. The dissolution of Fe attached to the dust (0.23-0.61%) and to the anthropogenic particles (0.86-1.85%) was consistent with previous studies conducted under abiotic conditions. This result suggests that the possible enhancement of the dissolution processes caused by biological activity might have been balanced by Fe consumption by the biota and its adsorption on both mineral and organic particles.

    Original languageEnglish (US)
    Pages (from-to)1810-1819
    Number of pages10
    JournalLimnology and Oceanography
    Volume50
    Issue number6
    DOIs
    StatePublished - Jan 1 2005

    Fingerprint

    dust
    chlorophyll
    phosphate
    phosphates
    nutrient
    nutrients
    dissolution
    primary productivity
    nitrogen fixation
    silicates
    Mediterranean Sea
    microcosm
    effect
    primary production
    bioactive properties
    biota
    chlorophyll a
    adsorption
    community structure
    nutrient content

    ASJC Scopus subject areas

    • Oceanography
    • Aquatic Science

    Cite this

    Effect of atmospheric nutrients on the autotrophic communities in a low nutrient, low chlorophyll system. / Bonnet, Sophie; Guieu, Cecile; Chiaverini, Jacques; Ras, Joséphine; Stock, Agnès.

    In: Limnology and Oceanography, Vol. 50, No. 6, 01.01.2005, p. 1810-1819.

    Research output: Contribution to journalArticle

    Bonnet, Sophie ; Guieu, Cecile ; Chiaverini, Jacques ; Ras, Joséphine ; Stock, Agnès. / Effect of atmospheric nutrients on the autotrophic communities in a low nutrient, low chlorophyll system. In: Limnology and Oceanography. 2005 ; Vol. 50, No. 6. pp. 1810-1819.
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    abstract = "The effect of atmospheric inputs on phytoplanktonic dynamics was investigated in the Mediterranean Sea during the season characterized by a stratified water column, low primary productivity, and low concentrations of nutrients ([nitrate] < 50 nmol L-1; [phosphate] = 20 nmol L -1; [silicate] = 0.7 μmol L-1). We report here data obtained during microcosm enrichment experiments performed on the natural assemblage using different combinations of realistic additions (Saharan dust, Fe, Fe + phosphate, and anthropogenic particles). Saharan dust and Fe + phosphate treatments significantly stimulated primary production. Anthropogenic particles and Fe + phosphate treatments increased the chlorophyll a concentrations, enhancing mainly the small cells (pico- and nanophytoplankton). The autotrophic community structure was significantly altered; for example, Fe and Fe + phosphate additions benefited prokaryotic populations, indicating possible nitrogen fixation. The colimitation of both phosphate and Fe was removed by these additions. Results emphasized the effect of Fe, although the ambient concentration was close to 1 nmol L-1. The addition of dust benefited eukaryotic populations, which indicates that the dust was a possible source of nitrogen. An abiotic dissolution experiment of macronutrients attached to dust confirmed this hypothesis. The dissolution of Fe attached to the dust (0.23-0.61{\%}) and to the anthropogenic particles (0.86-1.85{\%}) was consistent with previous studies conducted under abiotic conditions. This result suggests that the possible enhancement of the dissolution processes caused by biological activity might have been balanced by Fe consumption by the biota and its adsorption on both mineral and organic particles.",
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