The AMORE project contributes to the implementation of an integrated land-coastal zone research methodology to assess and predict the eutrophication level of the coastal North Sea and the associated undesirable effects. The ultimate aim is to reduce the current context of uncertainty in which decisions to counteract the eutrophication of the NS and protect its natural resources are made. Process-level field and laboratory-scale experiments were conducted to improve the basic knowledge on mechanisms through which a change in nutrients (in terms of N:P:Si NO3:NH4 inorganic:organic N ratios) induced modification in the phytoplanktonic community structure and hence the functioning of the whole planktonic food-web. For this the MUMM station 330_a has been monitored for a period of three years.