http://www.helium.com/knowledge/240411-how-non-native-species-effect-an-ecosystem-introducing-new-species-damage-from-human-involvement.xml Helium.com > Botany > How non-native species affect an ecosystem en-us Copyright Helium.com Wed, 27 May 2009 04:32:24 GMT Wed, 27 May 2009 04:32:24 GMT