Competitive exclusion would suggest that if you've got two species competing strongly for the same set of resources the result will be that one species will survive and one species will die out. (Click the link if you want read about competitive exclusion).
As our successional sequence continues, those species that require similar sets of resources compete with each other. The victors prevail and we are left with an assemblage of species that are not competing strongly with one another.
At this stage we would not expect many (if any) new species to be added to the assemblage that makes up our community.
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