Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 5 4 2008 10.5194/bg-5-1145-2008 http://www.biogeosciences.net/5/1145/2008/ http://www.biogeosciences.net/5/1145/2008/bg-5-1145-2008.html http://www.biogeosciences.net/5/1145/2008/bg-5-1145-2008.pdf 1145 1156 2008-08-18 Microzooplankton grazing and phytoplankton growth in marine mesocosms with increased CO₂ levels K. Suffrian k.suffrian@physiologie.uni-kiel.de P. Simonelli J. C. Nejstgaard S. Putzeys Y. Carotenuto A. N. Antia Leibniz Institute for Marine Sciences (IFM-GEOMAR), Düsternbrooker Weg 20, 24105 Kiel, Germany University of Bergen, Department of Biology, P.O.Box 7800, 5020 Bergen, Norway Department of Biology, UNIFOB, P.O. Box 7800, 5020 Bergen, Norway Facultad de Ciencias del Mar, Universidad de las Palmas de Gran Canaria, 35017 Tafira Baja – Las Palmas, Spain Stazione Zoologica "A. Dohrn", Villa Comunale 1, 80121 Naples, Italy also at: CAU Kiel, Institute for Physiology, Hermann-Rodewald-Straße 5, 24118 Kiel, Germany Microzooplankton grazing and algae growth responses to increasing <i>p</i>CO₂ levels (350, 700 and 1050 μatm) were investigated in nitrate and phosphate fertilized mesocosms during the PeECE III experiment 2005. Grazing and growth rates were estimated by the dilution technique combined with taxon specific HPLC pigment analysis. Microzooplankton composition was determined by light microscopy. Despite a range of up to 3 times the present CO₂ levels, there were no clear differences in any measured parameter between the different CO₂ treatments. During days 3–9 of the experiment the algae community standing stock, measured as chlorophyll a (Chl-<i>a</i>), showed the highest instantaneous grow rates (<i>k</i>=0.37–0.99 d^&minus;1) and increased from ca. 2–3 to 6–12 μg l^&minus;1, in all mesocosms. 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