Plant species over-occupancy indicates river valleys are natural corridors for migration

River valleys are considered natural corridors for migration of plant species; however, there is a lack studies confirming higher colonisation rates species in these areas. We compare richness between ancient and recent forests (developed during after the nineteenth century) those located river valley with outside valley. hypothesise that, close to river, will be associated forests, thus indicating rate. The study area includes parts Elbe Valley landscape Czech Republic. sampled an equal number (20/20), but lying at different distances from river. used generalised linear models test effect distance dependence upon forest continuity (recent/ancient forest) on two categories, i.e. overall richness. Outside valley, was whereas comparable. In as well forests. Recent were more saturated by than that rate higher. These results confirm importance species.