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We perform a comparison of the properties of galaxies in compact groups,loose groups and in the field to deepen our understanding of the physicalmechanisms acting upon galaxy evolution in different environments. We selectsamples of galaxies in compact groups identified by McConnachie et al., loosegroups identified by Zandivarez and Martinez, and field galaxies from the SloanDigital Sky Survey. We compare properties of the galaxy populations in thesedifferent environments: absolute magnitude, colour, size, surface brightness,stellar mass and concentration. We also study the fraction of red and earlytype galaxies, the luminosity function, the colour-luminosity andluminosity-size relations. The population of galaxies in compact groups differfrom that of loose groups and the field. The fraction of read and early typegalaxies is higher in compact groups. On average, galaxies in compact groupsare systematically smaller, more concentrated and have higher surfacebrightness than galaxies in the field and in loose groups. For fixed absolutemagnitude, or fixed surface brightness, galaxies in compact groups are smaller.The physical mechanisms that transform galaxies into earlier types could bemore effective within compact groups given the high densities and low velocitydispersion that characterise that particular environment, this could explainthe large fraction of red and early type galaxies we found in compact groups.Galaxies inhabiting compact groups have undergone a major transformationcompared to galaxies that inhabit loose groups.

Comparing galaxy populations in compact and loose groups of galaxies