Evolutionary Significant Unit

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An Evolutionary Significant Unit (ESU) is a group that is considered distinct for purposes of conservation under the Endangered Species Act. This term can apply to any species, subspecies, geographic race, or population. To qualify as an ESU, a population must 1) be substantially reproductively isolated from other conspecific populations, and 2) represent an important component in the evolutionary legacy of the biological species (Waples 1991).

[edit] References

Waples, R. S. 1991. Pacific salmon, Oncorhynchus spp., and the definition of "species" under the Endangered Species Act. Mar. Fish. Rev. 53(3):11-22.

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