Habitat transforming effects of non-native and invasive tree species.
The spread and habitat transformation effects of invasive plant species cause global environmental problems. In Hungary occurring invasive tree species, such as black cherry, common hackberry, russian olive, black locust, tree of heaven, boxelder and green ash, can transform native communities and architecture of habitats considerably. These species have usually less consumer species comparing to native tree species. Their pests can be introduced with them as well, which can also become invasive. Tree rot fungi can colonize them slower, so that less diverse microhabitats would form on them, and so less species would inhabit them. Habitat transformation can be facilitated by antropogen influences further, such as soil works, deforestation and river control. Climate change can influence the range and occurrence patterns of both native and alien species. Alteration of native communities could be so intensive, that habitat restoration would be much source and work intensive, even if it would be possible.