The third definition is an expansion of the first and defines an invasive species as a 'widespread non-indigenous species'.

The third definition identifies invasive species as a widespread non-indigenous species.

Where this is a non-indigenous species, eradication methods are often sought.

Biological invasions in California wetlands: the impacts and control of non-indigenous species in natural areas.

In Northwest Europe about 20 species are known (including non-indigenous species).

Both native and non-indigenous species have been planted, and are being evaluated for their suitability to the local conditions.

This use of non-indigenous species can be construed as 'heretical' in relation to official policy.

It is a very rarely found in western Europe, where it is considered to be an non-indigenous species.

An introduced species is a nonnative or non-indigenous species.

A number of plant species are now extinct due to grazing livestock, and aggressive non-indigenous species taking over the land.