  We investigate the correlation functions of mesoscopic electronic transport
in open chaotic quantum dots with finite tunnel barriers in the crossover
between Wigner-Dyson ensembles. Using an analytical stub formalism, we show the
emergence of a depletion/amplification of conductance fluctuations as a
function of tunnel barriers, for both parametric variations of electron energy
or magnetoconductance fields. Furthermore, even for pure Dyson ensembles,
correlation functions of conductance fluctuations in chaotic quantum dots can
exhibit anti-correlation. Experimental support to our findings is pointed out.
