"The full impact of an alien species on an area's habitat may not come to light until decades after its intentional introduction, a report has warned.
Researchers suggest that the seeds of future invasions have already been sown, making them difficult to control.
The team of European scientists called on governments to tighten controls on international trade that involved potentially invasive species."
Read the full story at the BBC:http://www.bbc.co.uk/news/science-environment-12041943