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Alien species are highly invasive and ar...

Alien species are highly invasive and are a threat toindigenous species. Substantiate this statement With any three examples.

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(i) Some alien (exotic) species become invasive and cause maximum harmful impact and the extinction of the indigenous species.
(ii) Nile perch a large predator fish was introduced 1n lake Victoria (East Africa) caused the extinction of an ecologically unique species of cichlid fish in the lake.
(iii) Invasive weed species like parthenium, lantana and Eicchornia caused environmental damage and pose threat to our native species.
(iv) Introduction of African catfish (clarias gariepinue) for aqua culture purposes is posing a threat to the indigenous cat fishes of Indian rivers.
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