EcoSTAR aims at understanding how the introduction or removal of man-made structures (MMS) will affect the North Sea ecosystem. The EcoSTAR research focusses on the interactions between man-made structures and top predators on the hand, and interactions between man-made structures and benthos on the other hand. Data will be integrated into a spatial food web model (North Sea Ecospace) to predict biomass changes in functionally important groups as a consequence of the introduction or removal of artificial hard substrates.