How large must populations be to retain evolutionary potential?

I. R. Franklin*, R. Frankham

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    297 Citations (Scopus)


    Maintaining genetic variation for future evolutionary change is an important issue for conservation biology. However, there is controversy over the effective population size (Ne) required for endangered species to retain their evolutionary potential, with proposed sizes ranging from 500 to 5000. The highest estimate is based on the assumption that 90% of mutations are deleterious. We review the arguments for an effective size of 5000 and conclude that it assumes effective mutation rates that are too low, and heritabilities that are, in general, very high. We conclude that an Ne of 500-1000 is appropriate at this time.

    Original languageEnglish
    Pages (from-to)69-70
    Number of pages2
    JournalAnimal Conservation
    Issue number1
    Publication statusPublished - Feb 1998


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