Before revision:  This project, focus on the enhancement or inhibition of selective advantage in PD subject to advection of compressible turbulence. We find that in presence of weak flows compared to the no-flow case, on URLanisms born at sources acquiring a significant advantage .
After revision:  This project, focus on the case of weakly compressible flows in two dimensions. This URLanisms such as phytoplankton living at a specific depth in the three-dimensional, incompressible ocean experiencing upwelling and/or downwelling events. We show URLanisms born at sources acquiring a significant advantage .