Question

How does introduction of new exotic species change thebiodiversity? Give two examples.

Answer 1

Exotic species may outcompete native species, prey on them, or bring new diseases and parasites. If they spread rapidly, they can cause native populations to decline or disappear, reducing biodiversity.

Examples:

1. The Nile perch introduced into Lake Victoria preyed on endemic cichlid fishes, causing the virtual loss of many cichlid species.
2. Water hyacinth, introduced from South America, can spread over lakes and rivers, threatening aquatic species and disrupting ecosystems.