Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 7 1 2010 10.5194/bg-7-247-2010 http://www.biogeosciences.net/7/247/2010/ http://www.biogeosciences.net/7/247/2010/bg-7-247-2010.html http://www.biogeosciences.net/7/247/2010/bg-7-247-2010.pdf 247 255 2010-01-19 Effect of carbonate ion concentration and irradiance on calcification in planktonic foraminifera F. Lombard fla@aqua.dtu.dk R. E. da Rocha J. Bijma J.-P. Gattuso LSCE/IPSL, laboratoire CEA/CNRS/UVSQ, LSCE-Vallée, Bât. 12, avenue de la Terrasse, 91198 Gif-sur-Yvette CEDEX, France Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany INSU-CNRS, Laboratoire d'Océanographie de Villefranche-sur-mer, B.P. 28, 06234 Villefranche-sur-mer Cedex, France UPMC University of Paris 06, Observatoire Océanologique de Villefranche-sur-mer, 06230 Villefranche-sur-mer, France currently at: DTU Aqua, Technical University of Denmark, Kavalergården 6, 2920 Charlottenlund, Denmark The effect of carbonate ion concentration ([CO32−]) on calcification rates estimated from shell size and weight was investigated in the planktonic foraminifera Orbulina universa and Globigerinoides sacculifer. Experiments on G. sacculifer were conducted under two irradiance levels (35 and 335 μmol photons m−2 s−1). Calcification was ca. 30% lower under low light than under high light, irrespective of the [CO32−]. 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