The first organisms to colonize a disturbed ecosystem are the climax species.

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The first organisms to colonize a disturbed ecosystem are pioneer species, not climax species. Pioneer species are the first to colonize previously disrupted or damaged ecosystems, beginning a chain of ecological succession that ultimately leads to a more biodiverse steady-state ecosystem. Climax species are those that dominate the final stage of ecological succession.

The First Organisms to Colonize a Disturbed Ecosystem Are the Climax