3.5 non native species

The introduction of non native species to an ecosystem by humans is a major cause of species loss.

Introductions of non-native species usually fail because it is hard for species to adapt to a new environments

Invasive Species

Occasionally, an introduced species is successful in the new environment
Invasive species: a non-native species whose intentional or accidental introduction negatively impacts the natural environment
The new ecosystem may lack predators or diseases to control the population of the new species
The population of the new species may increase rapidly and become invasive

Controlling Introduced Species

Type of Control	Definition
chemical control	Pesticides are used on forest and agricultural pests. Environmental risks include pollution and killing native species.
mechanical control	Physical barriers or removal can be used to control some invasive species.
biological control	Intentionally introduced organisms may be used to control the invasive species.