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Definition: A subpopulation (deme) whose members are drawn disproportionately from other subpopulations of the same species; for example, a deme occupying an environmentally unstable area whose members are periodically destroyed by climatic changes and then replenished by colonists from other demes when favorable conditions are restored.
Source: Hickman, C.P., et al. 2011. Integrated Principles of Zoology. Fifteenth Edition. McGraw-Hill Higher Education.