Abstract
We demonstrate that sea quark effects of a magnitude expected from renormalization group considerations are clearly visible in the strong coupling constant measured in current full QCD simulations. Building on this result an estimate of ${\ensuremath{\alpha}}_{\stackrel{-}{\mathrm{MS}}}^{(5)}({M}_{Z})$ ($\stackrel{-}{\mathrm{MS}}$ denotes the modified minimal subtraction scheme) is made employing the charmonium $1S\ensuremath{-}1P$ mass splitting calculated on full QCD configurations generated with two flavors of dynamical Kogut-Susskind quarks to fix the scale.
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