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We present spectroscopic observations of 182 disk galaxies (96 in the clusterand 86 in the field environment) in the region of the Abell 901/902 multiplecluster system, which is located at a redshift of $z\sim 0.165$. The presenceof substructures and non-Gaussian redshift distributions indicate that thecluster system is dynamically young and not in a virialized state. We findevidence for two important galaxy populations. \textit{Morphologicallydistorted galaxies} are probably subject to increased tidal interactions. Theyshow pronounced rotation curve asymmetries at intermediate cluster-centricradii and low rest-frame peculiar velocities. \textit{Morphologicallyundistorted galaxies} show the strongest rotation curve asymmetries at highrest-frame velocities and low cluster-centric radii. Supposedly, this group isstrongly affected by ram-pressure stripping due to interaction with theintra-cluster medium. Among the morphologically undistorted galaxies, dusty redgalaxies have particularly strong rotation curve asymmetries, suggesting rampressure is an important factor in these galaxies. Furthermore, dusty redgalaxies on average have a bulge-to-total ratio higher by a factor of two thancluster blue cloud and field galaxies. The fraction of kinematically distortedgalaxies is 75% higher in the cluster than in the field environment. Thisdifference mainly stems from morphological undistorted galaxies, indicating acluster-specific interaction process that only affects the gas kinematics butnot the stellar morphology. Also the ratio between gas and stellar scale lengthis reduced for cluster galaxies compared to the field sample. Both findingscould be best explained by ram-pressure effects.

Ram pressure and dusty red galaxies - key factors in the evolution of the multiple cluster system Abell 901/902