  The Allee effect is an important phenomenon in population biology
characterized by positive density dependence, that is a positive correlation
between population density and individual fitness. However, the effect is not
well studied in multi-level trophic food chains. We consider a ratio dependent
spatially explicit three species food chain model, where the top predator is
subjected to a strong Allee effect.
  We show the existence of a global attractor for the the model, that is upper
semicontinuous in the Allee threshold parameter $m$. To the best of our
knowledge this is the first robustness result, for a spatially explicit three
species food chain model with an Allee effect. Next, we numerically investigate
the decay rate to a target attractor, that is when $m=0$, in terms of $m$. We
find decay estimates that are $\mathcal{O}(m^{\gamma})$, where $\gamma$ is
found explicitly. Furthermore, we prove various overexploitation theorems for
the food chain model, showing that overexploitation has to be driven by the
middle predator. In particular overexploitation is not possible without an
Allee effect in place. We also uncover a rich class of Turing patterns in the
model which depend significantly on the Allee threshold parameter $m$. Our
results have potential applications to trophic cascade control, conservation
efforts in food chains, as well as Allee mediated biological control.
