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New quantitative method enables researchers to assess environmental risks posed by non-native species Posted: 26 Dec 2011 06:30 AM PST The Harlequin ladybeetle, Japanese knotweed and the American lobster -- while this trio of creatures may have friendly sounding names, they are all introduced species in Norway, and may be anything but friendly to the Norwegian environment. But determining exactly how damaging introduced species may be in their new environment has always been something of a challenge for biologists and land managers -- until now.

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