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The South Australian rangelands are characterised by dominant chenopod shrubs with over - story of long -lived tree species. Because of longevity of many plants, population models are widely recognised as basic tools for analysing demographic data (Caswell 2001). They can be used to identify important processes like population growth rate, longevity and extinction. We used the matrix model developed by Tiver el. al. (this volume) to evaluate the demography of an arid zone plant species Acacia aneura (mulga) F.Muell. ex Benth. at various herbivory intensities.