Influence of exotic plant invasions on the structure and functional attributes of native ecosystems has been extensively documented and debated. The complex interactions of invasive species with native ecosystems make invasion ecology an interesting and important area of research. Prosopis julifora native to south and central America was introdouced in India to meet the fuel-wood requirements of the rural poor and to restore degrated lands. Now, it has become an aggressive weed in several parts of the country and poses a serious threat to native biodiversity.