at these redshifts. The pBzK galaxies are nevertheless likely to be among the most massive systems, since the mass-to-light ratio will be significantly lower for the actively star-forming systems.

Under the assumption that the pBzKs passively evolve to the present day (with minimal merging) one can estimate their contribution to the bright end of the present-day luminosity function. The implied evolution is modelled from $z\sim 1.60$ (the median value for pBzKs) to $z=0$ assuming the spectral evolution models of [@Bruzual_and_Charlot:2003]. For simplicity we chose a solar metalicity model and a Salpeter initial mass function [@Salpeter:1955] and assume only passive evolution from initial formation bursts at redshifts $z_f=3$ and $z_f=10$. This results in a Johnson $K$-band absolute magnitude evolution in the range $0.96 < \Delta M_{K} < 1.21$. Taking the mean value we can estimate the minimum number of present day bright ($K < -23.4$) galaxies that could previously have been pBzKs. Under our assumptions we find that $2.5\%$ of such galaxies can be explained by passively evolved pBzKs. It is assumed that the remainder is made up of the descendants of bright sBzKs and merger remnants from within and between the two classes.

Discussion and conclusions
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We present the 