Co-extinction and introduction of alien species too are responsible fo

1.	Co-extinction and introduction of alien species too are responsible for the loss of biodiversity. Explain how.
Answer» i. Alien (exotic) species invasions • Some alien (exotic) species when introduced unintentionally or deliberately, become invasive and cause harmful impact, resulting in extinction of the indigenous species. • Nile perch, a large predator fish when introduced in Lake Victoria (East Africa) caused the extinction of an ecologically unique species of Cichlid fish in the lake. ii. Co-extinctions • When a species becomes extinct, the plant and animal species associated with it in an obligatory manner, also become extinct. • For example, if the host fish species becomes extinct, all those parasites exclusively dependent on it, will also become extinct; in plant–pollinator mutualism also, extinction of one results in the extinction of the other.

Co-extinction and introduction of alien species too are responsible for the loss of biodiversity. Explain how.

Answer»

i. Alien (exotic) species invasions

• Some alien (exotic) species when introduced unintentionally or deliberately, become invasive and cause harmful impact, resulting in extinction of the indigenous species.

• Nile perch, a large predator fish when introduced in Lake Victoria (East Africa) caused the extinction of an ecologically unique species of Cichlid fish in the lake.

ii. Co-extinctions

• When a species becomes extinct, the plant and animal species associated with it in an obligatory manner, also become extinct.

• For example, if the host fish species becomes extinct, all those parasites exclusively dependent on it, will also become extinct; in plant–pollinator mutualism also, extinction of one results in the extinction of the other.

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