Factors limiting heterotrophic bacterial production in the southern Pacific Ocean

F. Van Wambeke, S. Bonnet, T. Moutin, P. Raimbault, G. Alarcón, Cecile Guieu

    Research output: Contribution to journalArticle

    Abstract

    The role of potential factors limiting bacterial growth was investigated along vertical and longitudinal gradients across the South Eastern Pacific Gyre. The effects of glucose, nitrate, ammonium and phosphate additions on heterotrophic bacterial production (using leucine technique) were studied in parallel in unfiltered seawater samples incubated under natural daily irradiance. The enrichments realized on the subsurface showed three types of responses. From 141° W (Marquesas plateau) to approx 125° W, bacteria were not bottom-up controlled, as confirmed by the huge potential of growth in non-enriched seawater (median of enhancement factor×39 in 24 h). Within the Gyre (125° W–95° W), nitrogen alone stimulated leucine incorporation rates (median×4.2), but rapidly labile carbon (glucose) became a second limiting factor (median×37) when the two elements were added. Finally from the border of the gyre to the Chilean upwelling (95° W–73° W), labile carbon was the only factor stimulating heterotrophic bacterial production. Interaction between phytoplankton and heterotrophic bacterial communities and the direct versus indirect effect of iron and macronutrients on bacterial production were also investigated in four selected sites: two sites on the vicinity of the Marquesas plateau, the centre of the gyre and the Eastern border of the gyre. Both phytoplankton and heterotrophic bacteria were limited by availability of nitrogen within the gyre, but not by iron. Iron limited phytoplankton at Marquesas plateau and at the eastern border of the gyre. However 48 h enrichment experiments were not sufficient to show any clear limitation of heterotrophic bacteria within Marquesas plateau and showed a limitation of these organisms by labile carbon in the eastern border of the Gyre.

    Original languageEnglish (US)
    Pages (from-to)833-845
    Number of pages13
    JournalBiogeosciences
    Volume5
    Issue number3
    DOIs
    StatePublished - May 5 2008

    Fingerprint

    gyre
    Pacific Ocean
    limiting factor
    plateaus
    phytoplankton
    ocean
    iron
    leucine
    carbon
    bacteria
    seawater
    plateau
    glucose
    nitrogen
    ammonium nitrate
    bacterial communities
    bacterium
    microbial growth
    phosphates
    longitudinal gradient

    ASJC Scopus subject areas

    • Ecology, Evolution, Behavior and Systematics
    • Earth-Surface Processes

    Cite this

    Van Wambeke, F., Bonnet, S., Moutin, T., Raimbault, P., Alarcón, G., & Guieu, C. (2008). Factors limiting heterotrophic bacterial production in the southern Pacific Ocean. Biogeosciences, 5(3), 833-845. https://doi.org/10.5194/bg-5-833-2008

    Factors limiting heterotrophic bacterial production in the southern Pacific Ocean. / Van Wambeke, F.; Bonnet, S.; Moutin, T.; Raimbault, P.; Alarcón, G.; Guieu, Cecile.

    In: Biogeosciences, Vol. 5, No. 3, 05.05.2008, p. 833-845.

    Research output: Contribution to journalArticle

    Van Wambeke, F, Bonnet, S, Moutin, T, Raimbault, P, Alarcón, G & Guieu, C 2008, 'Factors limiting heterotrophic bacterial production in the southern Pacific Ocean', Biogeosciences, vol. 5, no. 3, pp. 833-845. https://doi.org/10.5194/bg-5-833-2008
    Van Wambeke F, Bonnet S, Moutin T, Raimbault P, Alarcón G, Guieu C. Factors limiting heterotrophic bacterial production in the southern Pacific Ocean. Biogeosciences. 2008 May 5;5(3):833-845. https://doi.org/10.5194/bg-5-833-2008
    Van Wambeke, F. ; Bonnet, S. ; Moutin, T. ; Raimbault, P. ; Alarcón, G. ; Guieu, Cecile. / Factors limiting heterotrophic bacterial production in the southern Pacific Ocean. In: Biogeosciences. 2008 ; Vol. 5, No. 3. pp. 833-845.
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