evolutionarily significant unit

evolutionarily significant unit
a population or group of populations inhabiting a defined geographical area that comprises a unique segment of the species; a distinct population, reproductively isolated from other conspecific populations and is an important evolutionary legacy of the species. Abbreviated as ESU. An ESU is often treated as a "species" in conservation assessments

Dictionary of ichthyology. 2009.

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  • evolutionary significant unit — evolutionarily significant unit …   Dictionary of ichthyology

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