  We consider an all-sky sample of 1029 Local Volume (LV) galaxies situated
within a distance of 11 Mpc. Their majority have precise distances, estimates
of hydrogen mass fraction and star-formation rate derived from far-ultraviolet
or Halpha fluxes. To describe an environment, we attribute two dimensionless
values: the density contrast created by the most significant neighbour and the
local density contrast produced by all neighbours within a separation of 1 Mpc.
The hydrogen mass fraction exhibits a weak effect of HI deficiency being the
most pronounced for dwarf irregular galaxies. The specific star-formation rate
(sSFR) is more sensitive to the environment than the hydrogen mass fraction.
Almost all (99 per cent) LV galaxies have their sSFR below -9.4 dex (1/yr). We
notice that irregular dwarfs as well as late-type bulgeless galaxies are
capable to reproduce their stellar mass with the observed sSFR over the cosmic
time. Thus, the transformation of gas into stars in dIrs and spiral disks is
rather sluggish unlike that in E, S0, dSph galaxies, whose star-formation
history has been stormy and short. Scatter of SFR(Halpha)-to-SFR(FUV) ratio
increases from Sc, Sd, Sm galaxies towards BCD, Im, Ir types that favours the
idea of bursty star formations in low-mass galaxies. However, this bursty
activity is caused rather by internal processes than by an external tidal
action. A fraction of quenched E, S0, dSph galaxies increases from ~5 per cent
in the field up to ~50 per cent in the densest regions.
