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Since species native to the dry Southwest have evolved in an environment with a complex climate, how is it that these plants can be outcompeted by relative newcomers?

Last Updated: May 15, 2011

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It is true that native plants in harsh, dry environments have special adaptations to take advantage of ephemeral moisture sources and to endure long drought periods. However, competition for resources (moisture, light, nutrients) is fierce in the often resource-limited environments of the Southwest, and the delicate balance between native species can be quickly disrupted by more competitive exotic species. Tom DeGomez, Area Agent and Regional Specialist, University of Arizona

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