Question

“Alien species invasion is a threat to endemic species” – Substantiate this statement.

Hint:

Remember: Alien species → Compete + Destroy → Threat to natives.

Answer 1

Concept: Alien (exotic) species are those introduced outside their natural habitat, often causing ecological imbalance.
Step 1: Definition.
Alien species are non-native organisms introduced intentionally or accidentally into a new ecosystem.
Step 2: Threat to endemic species.

• Competition: Alien species compete for food, space, and resources
• Predation: Some alien species prey on native species
• Disease transmission: Introduce new diseases
• Habitat alteration: Modify the natural environment

Step 3: Examples.

• Lantana camara displacing native plants
• Nile perch causing extinction of native fish in African lakes
• Water hyacinth clogging water bodies

Step 4: Impact.

• Loss of biodiversity
• Extinction of endemic species
• Ecological imbalance

Step 5: Conclusion.
Thus, invasion of alien species poses a serious threat to endemic species and ecosystem stability.