  We present our results on transverse momentum fluctuations and multiplicity
fluctuations in the framework of the clustering of color sources. In this
approach, elementary color sources -strings- overlap forming clusters, so the
number of effective sources is modified. These clusters decay into particles
with mean transverse momentum that depends on the number of elementary sources
that conform each cluster and the area occupied by the cluster. We find a
non-monotonic dependence of the $p_T$ and multiplicity fluctuations with the
number of participants. In our approach, the physical mechanism responsible of
these fluctuations is the same: the formation of clusters of strings that
introduces correlations between the produced particles.
