Abstract : The present modeling study aims to estimate the impact of dynamic variability, from large to sub-mesoscale, on planktonic ecosystem structure and functioning in the North-East Atlantic Ocean. In a first part, we investigate the ecosystem seasonal cycle using 1D configuration. On average, the model shows a strong annual cycle, with important regeneration fluxes, forced by the evolution of the mixed layer depth (MLD). Considering the MLD distribution, the model reproduces meridian variations of the seasonal cycle and of the flux amplitudes. In a second part, a 3D configuration shows contrasting ecosystem behavior between eddies structures and surrounding waters. At sub-mesoscale, the model indicates important MLD gradients and vertical velocities which modify the input of light and nutrients, and hence the primary production. The impact of the three considered scales on the plankton production varies according to the seasonal cycle.