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Definition: A stable subpopulation (derne) that serves differentially as a source of colonists for establishing, joining, or replacing other such subpopulations of the same species; for example, a deme inhabiting an environmentally stable area whose members routinely establish transitory populations in environmentally unstable nearby areas.
Source: Hickman, C.P., et al. 2011. Integrated Principles of Zoology. Fifteenth Edition. McGraw-Hill Higher Education.