what is meant by competitve release ? how does it effect population density?

Dear student.

The correct term is competitive.

Competitive release is a situation in which an organism is relieved of the stresses associated with competition allowing it to become more successful and dominant in its habitat.  It occurs when the competing species is no longer present in an ecosystem and its constraint on the winner's population size is removed.

When the removal of one species increases the number of individuals of other competitive species in the ecosystem drastically, it is called competitive release. In this case when one of the two competitive species is removed the population of other species increases. 

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Regards.

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