  We propose that dramatic changes in the variances and covariance of protons
and antiprotons can result if baryons approach chemical equilibrium in nuclear
collisions at RHIC. To explore how equilibration alters these fluctuations, we
formulate both equilibrium and nonequilibrium hadrochemical descriptions of
baryon evolution. Contributions to fluctuations from impact parameter averaging
and finite acceptance in nuclear collisions are numerically simulated.
