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Science 21 July 2006:
Vol. 313. no. 5785, p. 298
DOI: 10.1126/science.1128946
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Technical Comments

Comment on "Opposing Effects of Native and Exotic Herbivores on Plant Invasions"

Anthony Ricciardi* and Jessica M. Ward

Parker et al. (Reports, 10 March 2006, p. 1459) showed that native herbivores suppress exotic plants more than native plants. Further analysis reveals that the effect of native herbivores is reduced on exotic plant species that are closely related to native species in the invaded region. Exotic plants may share traits with native congeners that confer similar resistance to resident herbivores.

Redpath Museum, McGill University, Montreal, Quebec H3A 2K6, Canada.

* To whom correspondence should be addressed. E-mail: tony.ricciardi{at}mcgill.ca

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Science. ISSN 0036-8075 (print), 1095-9203 (online)