Davis said that non-native species need to be addressed on a case-by-case basis.

Anthropogenic disturbances often change ecological communities and provide opportunities for non-native species invasion.

In Ireland we are familiar with damage caused by non-native species.

Other landowners, viewing the non-native species as a fashionable garden novelty, soon followed suit.

It's a non-native species and not officially welcome here.

People have heard that non-native species represent the second-greatest extinction threat in the world, and it's just not true.

For animal lovers horrified by the potential expansion of culls of non-native species, Shuttleworth mounted a more philosophical justification.

New Zealand has strict laws prohibiting the importation of non-native species - snakes are not permitted even for the zoos.

Those potentially fisheries-wrecking fish also embody what some biologists call 'the homogecene': Habitat disruption and non-native species flow reduce ecological uniqueness.

But the USDA has warned people against planting the seeds, saying they could be non-native species or carry pests and diseases.

The EU is currently developing new international legislation on invasive non-native species and this is a major opportunity to prevent future problems.

Photo: 123rf More than a million volunteers are needed to tackle the spread of invasive non-native species in the UK, MPs say.

The phrase "invasive non-native species" (Inns) describes those species that have been directly moved as a result of human activity.

Improved water clarity on Lough Derg has been attributed to the presence of zebra mussels, a non-native species of fresh water mussel.

Research also shows most non-native species need incredibly high removal rates to slow their spread, something that recreational hunting and cooking can't accomplish.

The Wildlife Resources Commission said allowing landowners to trap and hunt coyotes provided an effective way to manage the population of the non-native species.