Biology / Bio 3609 · Atom · ~20 seconds
Primary and Secondary Ecological Succession
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Primary succession begins on newly exposed substrate with no prior soil or life, such as bare rock; secondary succession begins where soil remains after life is disturbed or removed.
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Bare rock left by a retreating glacier undergoes primary succession; a burned forest with intact soil undergoes secondary succession.
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Secondary succession proceeds faster mainly because soil, the slowest resource to rebuild, is present.