Give the main causes of extinction of a species by human intervention.

Explanation

The world is facing accelerated rate of species extinction largely due to human activities.There are four major causes called "The evil quartet".
(i) Habitat loss and fragmentation - Urbanisation,industrialisation,clearing forest for agriculture,filling wetlands,caused extinction of endemic species.
(ii) Over exploitation -Causing reduction to size of its population so that it becomes vulnerable to extinction.
(iii) Alien species invasions - Non native species introduced for economic and other uses,invaded and drive away the local species.Exotic/alien species have proved harmful to both aquatic and terrestrial ecosystems.
(iv) Co extinction- Certain obligatory mutualistic relationship exist in nature .Extinction of one will automatically cause extinction of other.For example,if the host fish becomes extinct all the parasites exclusively found in it will also become extinct.