The role of the coupling between electronic states and vibrational degrees of freedom (EVC) for exciton energy transfer (EET) in photosynthetic complexes has been in the focus of this thesis. The high-dimensional time-dependent Schrödinger equations have been solved. It could be shown that at the one hand experimental spectral densities are influenced by delocalization of the exciton states, on the other hand the dynamics relies on the details of computed SDs. Further, it could be shown that in FMO the dissipative character of EET and the pathways of the exciton transfer is imprinted by EVC.<eng>