  We study the morphology of galaxy populations of the richest superclusters
from the catalogue of superclusters of galaxies in the 2dF Galaxy Redshift
Survey using the luminosity density distribution and Minkowski functional V3.
We compare the properties of grouped and isolated galaxies in regions of
different density in superclusters. We find that in high-density cores of rich
superclusters there is an excess of early type, passive galaxies, among
galaxies in groups and clusters, as well as among those which do not belong to
groups, while in lower density outer regions there are more blue, star-forming
galaxies both in groups and among those galaxies which do not belong to groups.
This also shows that the galaxy content of groups depends on the environment
where the groups reside in. The density distributions and the behaviour of the
Minkowski functional V3 for different superclusters show that substructures in
superclusters as traced by different populations of galaxies are very
different. Our results show that both local (group/cluster) and global
(supercluster) environments are important in forming galaxy morphologies and
star formation activity. The presence of a high density core with X-ray
clusters and a relatively small fraction of star-forming galaxies in the
supercluster SCL126 may be an indication that this supercluster has started its
evolution earlier than the supercluster SCL9.
