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Species that were introduced by humans, either deliberately or accidentally
Why are invasive species not effectively controlled?
Due to the absence of natural predators.
Species which occur naturally in an ecological niche in an area
What are endemic species regulated by?
Density-dependent factors
Nutria
Imported to France and Germany for their fur but escaped to Switzerland living along riversides
Nutria destroys valuable wetland habitat by burrowing deep wholes and creates economic costs through crop loss
What is the impact of Nutria on local species?
Takes away livable space of endemic species and transmits parasites and bacteria to local species
Japanese Knotweed
Grows up to 3m with a very extensive root network
Where does the Japanese Knotweed grow?
Close to riverbeds which pushes back endemic plants that are better suited to the terrain
Where does Japanese Knotweed grow between?
Bricks and walls causing breakage and destruction
Box-tree Caterpillar
What do young caterpillars eat?
Parts of the chlorophyl
What can older caterpillars defoliate?
An entire plant in a short period of time
Himalayan Balsam
Produces very quickly and leads to a high density of plant growth
Reduces biodiversity, and facilitates erosion due to resource competition with local plants along embankments and rivers
What does it appear as in forests?
A pest reducing natural tree growth of local species
Note 
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