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CE review wkst - Ecological succession this is the...

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Ecological succession : this is the transition in the species composition of a community following a disturbance. The disturbed area may be colonized by a variety of species, which are gradually replaced by other species, which are in turn replaced by still other species. Primary succession : The type of ecological succession that occurs in an area where there were originally no organisms present and where soil has not yet formed Secondary succession : The type of succession that occurs where an existing community has been cleared by some disturbance that leaves the soil or substrate intact Early arrivals may facilitate the appearance of the later species by making the environment more favorable. Alternatively, the early species may inhibit establishment of the later species, so that successful colonization by later species occurs in spite of the activities of the early species. Four Stages in succession: 1. Pioneer stage 2. Dryas stage 3. Spruce stage 4. Alder stage
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