Effects of zooplankton diel vertical migration on a phytoplankton community: a scenario analysis of the underlying mechanisms Thomas Petzoldt a,* , Lars Rudolf a,b , Karsten Rinke a,c , J¨ urgen Benndorf a a Technische Universit¨ at Dresden, Institute of Hydrobiology, 01062 Dresden, Germany. b Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany. c University of Konstanz, Limnological Institute, 78457 Konstanz, Germany. Preprint submitted to Elsevier 31.01.2009