
In ecology, allogenic succession is succession driven by the abiotic components of an ecosystem. In contrast, autogenic succession is driven by the biotic components of the ecosystem. An allogenic succession can be brought about in a number of ways which can include: ...
Found on
http://en.wikipedia.org/wiki/Allogenic_succession

A succession caused by a change in environmental conditions that is unrelated to the activities of the developing plant community.
Found on
http://www.physicalgeography.net/physgeoglos/a.html
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