  A reaction-diffusion-advection predator-prey model with Holling type-II
predator functional response is considered. We show the stability/instability
of the positive steady state and the existence of a Hopf bifurcation when the
diffusion and advection rates are large. Moreover, we show that advection rate
can affect not only the occurrence of Hopf bifurcations but also the values of
Hopf bifurcations.
