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Motivated by recent experiments and models of biological segmentation, weanalyze the exicitation of pattern-forming instabilities of convectivelyunstable reaction-diffusion-advection (RDA) systems, occuring by means ofconstant or periodic forcing at the upstream boundary. Such boundary-controlledpattern selection is a generalization of the flow-distributed oscillation (FDO)mechanism that can include Turing or differential flow instability (DIFI)modes. Our goal is to clarify the relationships among these mechanisms in thegeneral case where there is differential flow as well as differentialdiffusion. We do so by analyzing the dispersion relation for linearperturbations and showing how its solutions are affected by differentialtransport. We find a close relationship between DIFI and FDO, while the Turingmechanism gives rise to a distinct set of unstable modes. Finally, weillustrate the relevance of the dispersion relations using nonlinearsimulations and we discuss the experimental implications of our results.Comment: Revised version with added content (new section and figures added),  changes to wording and organizatio

Pattern formation by boundary forcing in convectively unstable, oscillatory media with and without differential transport