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Nature 400, 311-312 (22 July 1999) | doi:10.1038/22419

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Speciation without isolation

Tom Tregenza1 & Roger K. Butlin1

There is abundant evidence that new species can arise when a population of organisms is split into isolated elements. The occurrence of sympatric speciation — speciation without isolation — is much more contentious but is now set on firmer theoretical ground.

  1. Tom Tregenza and Roger K. Butlin are in the Ecology and Evolution Programme, School of Biology, University of Leeds, Leeds LS2 9JT, UK.
    e-mail: Email: gentbt@gps.leeds.ac.uk