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Carbon isotopic fractionation by plankton in the Southern Indian Ocean: relationship between δ13 of particulate organic carbon and dissolved carbon dioxide
Bentaleb, I.; Fontugne, M.; Descolas-Gros, C.; Girardin, C.; Mariotti, A.; Pierre, C.; Brunet, C.; Poisson, A. (1998). Carbon isotopic fractionation by plankton in the Southern Indian Ocean: relationship between δ13 of particulate organic carbon and dissolved carbon dioxide. J. Mar. Syst. 17(1-4): 39-58. https://dx.doi.org/10.1016/S0924-7963(98)00028-1
In: Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam. ISSN 0924-7963; e-ISSN 1879-1573, more
Also appears in:
Le Fèvre, J.; Tréguer, P. (Ed.) (1998). Carbon Fluxes and Dynamic Processes in the Southern Ocean: Present and Past. Selected papers from the International JGOFS Symposium, Brest, France, 28-31 August 1995. Journal of Marine Systems, 17(1-4). Elsevier: Amsterdam. 1-619 pp., more
Peer reviewed article  
Available in  Authors 
Keywords
    Aquatic communities > Plankton
    Aquatic communities > Plankton > Phytoplankton
    Chemical compounds > Carbon compounds > Atmospheric gases > Carbon dioxide
    Isotopes > Carbon isotopes
    Nutritional types > Heterotrophy
    Marine/Coastal
Authors  Top 
  • Bentaleb, I.
  • Fontugne, M.
  • Descolas-Gros, C.
  • Girardin, C.
  • Mariotti, A.
  • Pierre, C.
  • Brunet, C., more
  • Poisson, A.
Abstract
    Simultaneous measurements of chlorophyll a, carboxylase activities (Rubisco and βcarboxylases) in phytoplankton, organic carbon content and isotopic composition (δ13C(POC)) of suspended particulate organic matter, and partial pressure of carbon dioxide in surface seawater were performed during the end of summer 1992, in the South Indian Ocean. Results indicate that plankton populations display different carbon metabolisms on both sides of the subtropical convergence (STC). North of STC, planktonic communities appeared to be dominated by mixo/heterotrophs, while south of STC, physiological (βC/R ratio) or biomass (C(POC)/Chl) parameters are characteristic of autotrophic phytoplankton. The isotopic fractionation (εp) between dissolved CO2 and SPOM is different for these two populations. Only δ13C values of flora dominated by diatoms south of the STC part showed a strong correlation with dissolved CO2 concentrations which permitted a relationship between these parameters for the Southern Ocean.
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