Invasion level of alien plants in semi-natural agricultural habitats in boreal region

We quantified the level of invasion (i.e. number or proportion of aliens of all species) of archaeophytes (introduced before 17th century) and neophytes (introduced after 17th century) in five semi-natural agricultural habitats and identified the factors affecting the occurrence of alien species in boreal region. The differences in native and alien plant species richness were analysed with generalized linear mixed models. One-third of the...