Native Species And Its Effects On The Local Ecosystem

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Introducing alien, exotic, non-indigenous, or non-native species,that lives outside its native environment or habitat, usually arrives there by human activity, either deliberate or accidental. Non-native species can have various effects on the local ecosystem. Introduced species that have a negative effect on a local ecosystem are also known as invasive species. Not all non-native species are considered invasive. Some have no negative effect and can, in fact, be beneficial as an alternative to pesticides in agriculture for example.[1]

The Botany Wetlands are a series of inter-connected ponds that cover an area of 58 hectares which stretch for over a four kilometre corridor in Sydney’s eastern suburbs, extending from Gardeners Road, Daceyville to Foreshore Drive. The Wetlands are about six kilometres south of the CBD. They served to provide fresh water to Sydney in the 1850s, however that ceased in 1886 and since had become neglected and weed infested [2]

The degradation of the Botany Wetlands stem from 1815, when it was first identified as a source of water supply for Sydney. It wasn’t until 1858 that the Botany Swamps Scheme provided Sydney with its third supply of water. So between 1866 and the mid 1870s dams and weirs were built to secure the water supply for the growing colony. Use of the wetlands as the primary freshwater supply ended in 1886, when the Upper Nepean Scheme took over. The row planting of an aquatic shrubby species introduced from the
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