  The results of an Halpha photometric survey of 30 dwarf galaxies of various
morphologies in the Centaurus A and Sculptor groups are presented. Of these 30,
emission was detected in 13: eight are of late-type, two are early-type and
three are of mixed-morphology. The typical flux detection limit of 2e-16 erg
s-1 cm-2, translates into a Star Formation Rate (SFR) detection limit of 4e-6
M_sol yr-1 . In the light of these results, the morphology-density relation is
reexamined: It is shown that, despite a number of unaccounted parameters, there
are significant correlations between the factors determining the morphological
type of a galaxy and its environment. Dwarf galaxies in high density regions
have lower current SFR and lower neutral gas content than their low density
counterparts, confirming earlier results from the Local Group and other denser
environments. The effect of environment is also seen in the timescale formed
from the ratio of blue luminosity to current SFR - dwarfs in higher density
environments have larger values, indicating relatively higher past average SFR.
The influence of environment extends very far and no dwarfs from our sample can
be identified as 'field' objects.
