During ecological succession:

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1. the establishment of a new biotic community is very fast in its primary phase.
2. the numbers and types of animals remain constant.
3. the changes lead to a community that is in near equilibrium with the environment and is called pioneer community.
4. the gradual and predictable change in species composition occurs in a given area.

The gradual and predictable change, in the composition of species takes place in a given area during ecological succession.