Environmental Impacts Of Invasive Alien Species

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products such as nitrogen and phosphorous released from the agriculture sector, and also the mineral deposition from industry. Ozone layer is depleted due chlorofluorohydrocarbons and some other chemicals released into the atmosphere, which permits penetration of ultraviolet light, which can be detrimental for biological organisms such as marine plankton communities (Sivasakthivel and Reddy, 2011). Introduced species / biological invasions Globally, impacts of invasive alien species (IAS) are the major threats to biological diversity. To understand the impact of biological diversity one should know the definition of biodiversity. Biodiversity is composed of three major features, namely, functional, compositional and structural diversity (Noss, 1990). Compositional diversity is most widely accepted to determine the number of species in the ecosystem. Though, functional and structural diversity play a vital role to know the ecosystem dynamics, which are repeatedly alerted by biological invasions. Biological invasions are the important component for changes in the ecological system (Vitousek et al., 1996). The introduction of Bromus tectorum in American rangelands increases the incidence and intensity of fires, which changes the shrub lands into grasslands. In California chaparral the invasion of alien grasses causes variation in species composition (Zedler et al., 1983). Plant invasions are best illustrated by Mimosa pigra of northern Australia, which collapse the plant

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