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Tamarix , or saltcedar, grows as a woody shrub or small tree. It was introduced to the United States in the 1850's as an ornamental plant capable of erosion control. It successfully adapted and quickly spread into wetlands displacing native trees such as cottonwood, willow and mesquite. Now, Tamarix has invaded nearly all the watercourses and wetlands in the Southwest US.

Using ArcGIS to Analyze and Predict Invasions

http://serc.carleton.edu/eyesinthesky2/week5/analyze_predict_invasions_arcgis.html#using_arcgis
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UC Berkeley Webcasts | Video and Podcasts: Spring 2011 Courses