Question

Alien species are highly invasive and are a threat to indigenous species. Substantiate this statement with any three examples.

Answer 1

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When alien species are introduced unintentionally or deliberately, they turn invasive and cause decline or extinction of indigenous species. Three examples are-

❀ Cichlid fish which is found in Lake Victoria led to extinction of nearly 200 species which introduced Nile Perch into Lake Victoria.

❀ The inclusion of invasive species such as carrot grass (Parthenium), Lantana and water hyacinth (Eicchornia) led to environmental damage of the native species.

❀ The indigenous catfishes found in rivers are a major species of extinction by the introduction of African catfish Clarias gariepinus which is a major advantage for aquaculture purposes.

Answer 2

Answer:

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Explanation:

When alien species are introduced unintentionally or deliberately, they turn invasive and cause decline or extinction of indigenous species. Three examples are-

❀ Cichlid fish which is found in Lake Victoria led to extinction of nearly 200 species which introduced Nile Perch into Lake Victoria.

❀ The inclusion of invasive species such as carrot grass (Parthenium), Lantana and water hyacinth (Eicchornia) led to environmental damage of the native species.

❀ The indigenous catfishes found in rivers are a major species of extinction by the introduction of African catfish Clarias gariepinus which is a major advantage for aquaculture purposes.

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