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Title:
Response of primary production and calcification to changes of pCO2 during experimental blooms of the coccolithophorid Emiliania huxleyi
Authors:
Delille, Bruno; Harlay, JéRôMe; Zondervan, Ingrid; Jacquet, Stephan; Chou, Lei; Wollast, Roland; Bellerby, Richard G. J.; Frankignoulle, Michel; Borges, Alberto Vieira; Riebesell, Ulf; Gattuso, Jean-Pierre
Affiliation:
AA(Unité d'Océanographie Chimique, Interfacultary Center for Marine Research (MARE), Université de Liège, Liège, Belgium), AB(Laboratoire d'Océanographie Chimique et Géochimie des eaux, Université Libre de Bruxelles, Campus de la Plaine, Brussels, Belgium), AC(Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany), AD(Station INRA d'Hydrobiologie Lacustre, UMR 42 Cartell, CNRS, Thonon, France), AE(Laboratoire d'Océanographie Chimique et Géochimie des eaux, Université Libre de Bruxelles, Campus de la Plaine, Brussels, Belgium), AF(Laboratoire d'Océanographie Chimique et Géochimie des eaux, Université Libre de Bruxelles, Campus de la Plaine, Brussels, Belgium), AG(Bjerknes Centre for Climate Research, University of Bergen, Bergen, Norway), AH(Unité d'Océanographie Chimique, Interfacultary Center for Marine Research (MARE), Université de Liège, Liège, Belgium), AI(Unité d'Océanographie Chimique, Interfacultary Center for Marine Research (MARE), Université de Liège, Liège, Belgium), AJ(Leibniz Institute for Marine Sciences, University of Kiel, Kiel, Germany), AK(Laboratoire d'Océanographie de Villefranche, UMR 7093, CNRS, Université Pierre et Marie Curie, Villefranche-sur-mer, France)
Publication:
Global Biogeochemical Cycles, Volume 19, Issue 2, CiteID GB2023 (GBioC Homepage)
Publication Date:
06/2005
Origin:
AGU; WILEY
Keywords:
Biogeosciences: Marine systems (4800), Biogeosciences: Biosphere/atmosphere interactions (0315), Global Change: Oceans (1616, 3305, 4215, 4513), Oceanography: Biological and Chemical: Photosynthesis, Oceanography: Biological and Chemical: Phytoplankton, calcification, coccolithophorid, global change
Abstract Copyright:
Copyright 2005 by the American Geophysical Union.
DOI:
10.1029/2004GB002318
Bibliographic Code:
2005GBioC..19.2023D

Abstract

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.
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