In the Adyar creek and estuary area, these invasive trees are spread across 40 acres, covering a large portion.
As part of the restoration work, the Prosopis trees were cleared before planting of the mangrove saplings, said the official.Initially, about 2,000 mangrove saplings were planted in the islands but they were washed away during the 2015 floods.
Avicennia plants are found on the banks of Buckingham Canal , behind the University of Madras campus.Mangroves grow very slowly, the official said.
More saplings were planted after the floods and work was completed in a year.Mangroves are natural wind barriers and provide protection from natural calamities including cyclones and hurricanes.
Fish lay eggs near the roots of mangroves and hatchlings stay in the area for a while as it provides protection from predatory organisms, the official said.
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