Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 5 2 2008 10.5194/bg-5-523-2008 http://www.biogeosciences.net/5/523/2008/ http://www.biogeosciences.net/5/523/2008/bg-5-523-2008.html http://www.biogeosciences.net/5/523/2008/bg-5-523-2008.pdf 523 533 2008-04-09 Response of marine viral populations to a nutrient induced phytoplankton bloom at different pCO2 levels J. B. Larsen A. Larsen aud.larsen@bio.uib.no R. Thyrhaug G. Bratbak R.-A. Sandaa Department of Biology, Jahnebakken 5, University of Bergen, P. Box 7800, 5020 Bergen, Norway During the PeECE III mesocosm experiment in 2005 we investigated how the virioplankton community responded to increased levels of nutrients (N and P) and CO2. We applied a combination of flow cytometry, Pulsed Field Gel Electrophoresis and degenerate PCR primers to categorize and quantify individual viral populations, and to investigate their temporal dynamics. 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