The formation of a new community where another community already exist is known as

Secondary succession.

Explanation:

The secondary succession process is that by which a species establishes itself in a territory, displacing the species that was previously settled there, forming a new community to the detriment of the previous community. A clear example of secondary succession is that of rodents in wooded areas, where through rapid reproduction they end up becoming the main species of the place, displacing other species due to the rapid consumption of available resources.

Secondary succession.

Explanation:

The formation of a new community where another community already exist is known as Secondary succession.

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