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* 1 The control of invasive species is a challenge heightened by the dependency of management outcomes on environmental variation. This is especially true for plants invading semi-arid habitats, where growing season precipitation varies greatly among years. * 2 Agropyron cristatum is an invasive grass widely introduced in the Great Plains of North America. We studied its demographic responses to management using field experiments and matrix population models. Plants were clipped to simulate grazing, treated with herbicide or left unmanaged, at three levels of water availability, for 2 years. * 3 Growth rates (?) were high in unmanaged populations. Clipped populations were mainly stable, whereas ? for herbicide-treated...


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