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Nature 387, 551-552 (5 June 1997) | doi:10.1038/42355

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Evolutionary biology:  Is speciation no accident?

Roger K. Butlin1 & Tom Tregenza1

New species arise when previously conspecific populations no longer interbreed successfully, even when they are living in the same place. This reproductive isolation can often be explained as an incidental by-product of other evolutionary changes1.

  1. Roger K. Butlin and Tom Tregenza are in the Ecology and Evolution Programme, Department of Biology, The University of Leeds, Leeds LS2 9JT, UK.