1. Pioneer species (white furrow shell, Abra alba) settle very quickly in the deep sand extraction site followed by plaice (Pleuronectes platessa).
  2. The occurrence of distinct species observed in the deep sand extraction site site and ecosystem-based landscaped sand bars seems to be related to differences in sediment characteristics.
  3. A 'new' macrozoobenthic species assemblage was observed, characterised by Abra alba (deposit-feeding bivalves).
  4. The fish assemblage at the crests of the sand bars differed significantly from the troughs with tub gurnard (Chelidonichthys lucerna) as a specific species of the crests. This is a first indication of the applicability of landscaping techniques to induce heterogeneity of the seabed although it remains difficult to draw a strong conclusion due the lack of replication in the experiment. it remains difficult to draw strong conclusions due the lack of replication in the experiment, furthermore, an ecological equilibrium is not reached after 2 years since biotic and abiotic variables are still adapting.