Understanding the relationship between diversity and community stability is of both theoretical and conservational interest especially in the light of marine fouling communities enhancing species invasion. To examine this relationship, we used natural species assemblages and observed their stability towards environmental change in a transplantation experiment. We exposed PVC settlement panels for four and two months respectively to natural fouling at two study sites in the Tokyo Bay. After this time, we transplanted half of the communities from one site to the other and vice versa and recorded the abundances of all macrofouler species for at least eight weeks. This experiment was replicated in two seasons. We regarded the speed of convergence, i.e. increase in similarity, between introduced and native communities as a measure for community stability. Older communities showed lower convergence rates, while in our case age was not positively correlated with diversity. We conclude that community stability is rather determined by species identity and dynamics of community composition than by diversity.