  We demonstrate that, due to their low surface mass density and large dark
matter content, LSB disks are quite stable against the growth of global bar
modes. However, they may be only marginally stable against local disk
instabilities. We simulate a collision between an LSB and HSB galaxy and find
that, while the HSB galaxy forms a strong bar, the response of the LSB disk is
milder, in the form of spiral features and an oval distortion. Unlike its HSB
counterpart, the LSB disk does not suffer strong inflow of gas into the central
regions. The lack of sufficient disk self-gravity to amplify dynamical
instabilities makes it difficult to explain strong interaction-driven
starbursts in LSB galaxies without invoking mergers.
