  In this paper, we study the physical properties and characteristics of matter
forming thin accretion disks in static and spherically symmetric wormhole
spacetimes. In particular, the time averaged energy flux, the disk temperature
and the emission spectra of the accretion disks are obtained for these exotic
geometries, and are compared with the Schwarzschild solution. It is shown that
more energy is emitted from the disk in a wormhole geometry than in the case of
the Schwarzschild potential and the conversion efficiency of the accreted mass
into radiation is more than a factor of two higher for the wormholes than for
static black holes. These effects in the disk radiation are confirmed in the
radial profiles of temperature corresponding to the flux distributions, and in
the emission spectrum \omega L(\omega) of the accretion disks. We conclude that
specific signatures appear in the electromagnetic spectrum, thus leading to the
possibility of distinguishing wormhole geometries by using astrophysical
observations of the emission spectra from accretion disks.
