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Question: Alien species are highly invasive and are a threat to indigenous species. Substantiate this statemen...

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

Explanation

Solution

When a new species is added into some species' natural habitat the species' growth will decline. Our biological wealth is declining rapidly and this is due to human activities. When humans colonize certain places it has led to native species extinction. IUCN has said that in the last 500 years 784 species have gone extinct.

Complete answer: When some new alien species is introduced unknowingly or purposefully some of the alien species will turn invasive and will lead to the decline or extinction of the native species.
Tilapia is a fish species that may have escaped from fish farms or was released intentionally and now it has spread worldwide. Tilapia tolerates salinity, it feeds on everything, from insects to algae. The younger tilapia are carnivores and the adults are omnivores. The impact of this species is huge. It is driving away the native species and invertebrates to go extinct.
The Indian crow has introduced on the east coast of Africa a century ago, now it has spread to coastal towns on the Red Sea and to the Indian ocean. It is still spreading inland. They are a great threat to human health, Poultry, and native bird populations.
The black rat is of Eurasian origin it is one of the most invasive mammal species in Africa. They feed on anything and it causes massive economic losses Throughout Africa and worldwide by contaminating food. These rats are also causing structural damage to the building by chewing and burrowing.

Note: When a new species is introduced in a new geographical region it is known as alien species. When it is introduced they cause significant loss to the environmental community. These will make the local species go extinct by eliminating them.
When Nile perch was introduced into Lake Victoria it disturbed the ecosystem of the lake.