Journal
SCIENCE
Volume 290, Issue 5491, Pages 521-523Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.290.5491.521
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Invading exotic plants are thought to succeed primarily because they have escaped their natural enemies, not because of novel interactions with their new neighbors. However, we find that Centaurea diffuse, a noxious weed in North America, has much stronger negative effects on grass species from North America than on closely related grass species from communities to which Centaurea is native. Centaurea's advantage against North American species appears to be due to differences in the effects of its root exudates and how these root exudates affect competition for resources. Our results may help to explain why some exotic species so successfully invade natural plant communities.
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