  The classical chemostat is an intensely investigated model in ecology and
bio/chemical engineering, where n-species, say $x_{1}, x_{2}...x_{n}$ compete
for a single growth limiting nutrient. Classical theory predicts that depending
on model parameters, one species competitively excludes all others.
Furthermore, this ''order'' of strongest to weakest is preserved, $x_{1} >>
x_{2} >> ...x_{n}$, for say $D_{1} < D_{2} <...D_{n}$, where $D_{i}$ is the net
removal of species $x_{i}$. Meaning $x_{1}$ is the strongest or most dominant
species and $x_{n}$ is the weakest or least dominant. We propose a modified
version of the classical chemostat, exhibiting certain counterintuitive
dynamics. Herein we show that if only a certain proportion of the weakest
species $x_{n}$'s population is removed at a ''very'' fast density dependent
rate, it will in fact be able to competitively exclude all other species, for
certain initial conditions. Numerical simulations are carried out to visualize
these dynamics in the three species case.
