[en] [1] 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 14 C 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.
UiB - University of Bergen DG RDT - Commission Européenne. Direction Générale de la Recherche et de l'Innovation BELSPO - Politique scientifique fédérale FRFC - Fonds de la Recherche Fondamentale Collective
Commentary :
An edited version of this paper was published by AGU. Copyright (2005) American Geophysical Union. Delille, B., et al. (2005), Response of primary production and calcification to changes of pCO2 during experimental blooms
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