  A selection of searches by the ATLAS experiment at the LHC for the
electroweak production of SUSY particles are used to study their impact on the
constraints on dark matter candidates. The searches use $20\,{\rm fb}^{-1}$ of
proton-proton collision data at $\sqrt{s}=8$ TeV. A likelihood-driven scan of a
five-dimensional effective model focusing on the gaugino--higgsino and Higgs
sector of the phenomenological minimal supersymmetric Standard Model is
performed. This scan uses data from direct dark matter detection experiments,
the relic dark matter density and precision flavour physics results. Further
constraints from the ATLAS Higgs mass measurement and SUSY searches at LEP are
also applied. A subset of models selected from this scan are used to assess the
impact of the selected ATLAS searches in this five-dimensional parameter space.
These ATLAS searches substantially impact those models for which the mass
$m(\tilde{\chi}^0_1)$ of the lightest neutralino is less than 65 GeV, excluding
86% of such models. The searches have limited impact on models with larger
$m(\tilde{\chi}^0_1)$ due to either heavy electroweakinos or compressed mass
spectra where the mass splittings between the produced particles and the
lightest supersymmetric particle is small.
