  The paper explores the influence of harvesting (or culling) on the outcome of
the competition of two species in a spatially heterogeneous environment. The
harvesting effort is assumed to be proportional to the space-dependent
intrinsic growth rate. The differences between the two populations are the
diffusion strategy and the harvesting intensity. In the absence of harvesting,
competing populations may either coexist, or one of them may bring the other to
extinction. If the latter is the case, introduction of any level of harvesting
to the successful species guarantees survival to its non-harvested competitor.
In the former case, there is a strip of "close enough" to each other harvesting
rates leading to preservation of the original coexistence. Some estimates are
obtained for the relation of the harvesting levels providing either coexistence
or competitive exclusion.
