  The dynamics of a reaction-diffusion-advection benthic-drift population model
that links changes in the flow regime and habitat availability with population
dynamics is studied. In the model, the stream is divided into drift zone and
benthic zone, and the population is divided into two interacting compartments,
individuals residing in the benthic zone and individuals dispersing in the
drift zone. The benthic population growth is assumed to be of strong Allee
effect type. The influence of flow speed and individual transfer rates between
zones on the population persistence and extinction is considered, and the
criteria of population persistence or extinction are formulated and proved.
