allogenic

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allogenic Applied to minerals, or other components of a rock, that have been derived from pre-existing rocks and transported some distance to form part of the present unit; e.g. quartz grains in a sandstone. Compare AUTHIGENIC.

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allogenic
1. Relating to or caused by a change in the environment or an individual organism brought about by some external factor. For example, the increased predation in a habitat caused by an immigrant predator would be described as allogenic. Compare autogenic.

2. (or allogeneic) Describing the variation that exists in the genotypes of different individuals, usually when these belong to the same species.

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allogenic Applied to successional change arising from a change in abiotic environmental conditions. Compare AUTOGENIC; see also SUCCESSION.

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allogenic Applied to successional change caused by a change in abiotic environmental conditions. Compare autogenic; see also succession.