In this thesis, I described how foundation species contribute to the of shape tidal flats based on a variety of species, regions and species interactions. Based on these results, I can conclude that both biological and physical processes play an important role in shaping tidal flats. For instance, the foundation species affect their environment strongly by sediment bioturbation or accretion. On the other hand, physical forces play an important role in the species distribution or the effect of foundation species on the environment i.e., when physical forces are too strong, foundation species will not survive or change their surroundings. To conclude, it is valuable to focus on an integral approach implementing both physical and biological pr...