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Response of primary production and calcification to changes of pCO2 during experimental blooms of the coccolithophorid Emiliania huxleyi
Unité d'Océanographie Chimique, Interfacultary Center for Marine Research (MARE), Université de Liège, Liège, Belgium
Laboratoire d'Océanographie Chimique et Géochimie des eaux, Université Libre de Bruxelles, Campus de la Plaine, Brussels, Belgium
Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany
Station INRA d'Hydrobiologie Lacustre, UMR 42 Cartell, CNRS, Thonon, France
Laboratoire d'Océanographie Chimique et Géochimie des eaux, Université Libre de Bruxelles, Campus de la Plaine, Brussels, Belgium
Laboratoire d'Océanographie Chimique et Géochimie des eaux, Université Libre de Bruxelles, Campus de la Plaine, Brussels, Belgium
Bjerknes Centre for Climate Research, University of Bergen, Bergen, Norway
Unité d'Océanographie Chimique, Interfacultary Center for Marine Research (MARE), Université de Liège, Liège, Belgium
Unité d'Océanographie Chimique, Interfacultary Center for Marine Research (MARE), Université de Liège, Liège, Belgium
Leibniz Institute for Marine Sciences, University of Kiel, Kiel, Germany
Laboratoire d'Océanographie de Villefranche, UMR 7093, CNRS, Université Pierre et Marie Curie, Villefranche-sur-mer, France
Primary production and calcification in response to different partial pressures of CO2 (PCO2) (“glacial,” “present,” and “year 2100” atmospheric CO2 concentrations) were investigated during a mesocosm bloom dominated by the coccolithophorid Emiliania huxleyi. The day-to-day dynamics of net community production (NCP) and net community calcification (NCC) were assessed during the bloom development and decline by monitoring dissolved inorganic carbon (DIC) and total alkalinity (TA), together with oxygen production and 14C incorporation. When comparing year 2100 with glacial PCO2 conditions we observed: (1) no conspicuous change of net community productivity (NCPy); (2) a delay in the onset of calcification by 24 to 48 hours, reducing the duration of the calcifying phase in the course of the bloom; (3) a 40% decrease of NCC; and (4) enhanced loss of organic carbon from the water column. These results suggest a shift in the ratio of organic carbon to calcium carbonate production and vertical flux with rising atmospheric PCO2.
Received 17 June 2004; accepted 6 April 2005; published 2 June 2005.
Citation: (2005), Response of primary production and calcification to changes of pCO2 during experimental blooms of the coccolithophorid Emiliania huxleyi, Global Biogeochem. Cycles, 19, GB2023, doi:10.1029/2004GB002318.
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