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Three models of succession.
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Description
A, B, C, and D represent four stages or seres. D represents the climax community. An arrow indicates “is replaced by,” and + = facilitation, ? = inhibition, and 0 = no effect. The facilitation model is the classic model of succession. In the inhibition model, much depends on which species gets there first. The tolerance model is similar to the facilitation model, in that later species may be facilitated by earlier species, but they can also invade in their absence.
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