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10 pages, 6 figuresAlexandrium catenella was grown in semi-continuous cultures in L1 growth-medium enriched with concentrated dissolved organic matter (DOM) from a diatom bloom. In medium with full nitrate (880 µM), the average growth rate was 0.32 ± 0.01 day–1 (L1, control without added DOM). Adding natural marine dissolved organic nitrogen (DON) at levels of 20–30 µM above background (10 µM) led to a higher growth rate (L1+DOM, 0.40 ± 0.00 day–1). In medium with lower nitrate level (175 µM) and higher DON (L1/5+DOM treatment), both dissolved inorganic nitrogen and DON were used, leading to the highest growth rates (0.43 ± 0.03 day–1). In medium without nitrate [(L1-N)+DOM treatment], the low ammonium concentrations observed throughout the experiment (<1 µM) as well as the uptake kinetics of A. catenella could not have supported the observed growth rates, leading us to conclude that DON was directly used by this organism, rather than using N remineralized by bacteria (from DON). The decrease of bacteria in DOM enriched bioassays could point to a nutrient limitation and competition with A. catenella for organic matter. Viruses likely contributed as an additional factor to keep the bacterial population from becoming dominantThis study was supported by the EC-funded Research Project SEED (Life cycle transformations among HAB species, and the environmental and physiological factors that regulate them; GOCE-CT-2005-003875), by the contract between ACA and CSIC, and by PROCAVIR (CTM2004-04404-CO2-01) and MICROVIS (CTM2007-62140) projects. S.L. was supported by a FCT (Fundação para a Ciência e para a Tecnologia, Portugal) grant within the III Quadro Comunitário de Apoio by the FSE; E.G. was supported by the Ramon y Cajal contract of the Spanish Ministry of Education and Science. Y.C. was supported by CNRS (Centre National de la Recherche Scientifique) and Ifremer (Institut Français de Recherche pour l'Exploitation de la Mer) ALTOX programPeer reviewe

Effect of marine autotrophic dissolved organic matter (DOM) on Alexandrium catenella in semi-continuous cultures