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Speciation in a ring

Author

Listed:
  • Darren E. Irwin

    (University of California, San Diego
    Lund University)

  • Staffan Bensch

    (Lund University)

  • Trevor D. Price

    (University of California, San Diego)

Abstract

The evolutionary divergence of a single species into two has never beendirectly observed in nature, primarily because speciation can take a longtime to occur. A ring species, in which a chain of intergrading populationsencircles a barrier and the terminal forms coexist without interbreeding,provides a situation in which variation in space can be used to infer variationin time1,2,3. Here we reconstruct the pathway to speciationbetween two reproductively isolated forms of greenish warbler (Phylloscopustrochiloides). These two taxa do not interbreed in central Siberia butare connected by a long chain of intergrading populations encircling the TibetanPlateau to the south4. Molecular data and climatic history implythat the reproductively isolated taxa came into contact following expansionsnorthward around the western and eastern sides of the plateau. Parallel selectionpressures for increased song complexity during the northward expansions havebeen accompanied by divergence in song structure. Playback experiments showthat the two Siberian forms do not recognize each other's songs. Our resultsshow how gradual divergence in a trait involved in mate choice leads to theformation of new species.

Suggested Citation

  • Darren E. Irwin & Staffan Bensch & Trevor D. Price, 2001. "Speciation in a ring," Nature, Nature, vol. 409(6818), pages 333-337, January.
    • Handle: RePEc:nat:nature:v:409:y:2001:i:6818:d:10.1038_35053059
    DOI: 10.1038/35053059
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    Cited by:

    1. Jason T Weir & Trevor D Price, 2019. "Song playbacks demonstrate slower evolution of song discrimination in birds from Amazonia than from temperate North America," PLOS Biology, Public Library of Science, vol. 17(10), pages 1-19, October.
    2. Strigul, Nikolay, 2009. "Can imitation explain dialect origins?," Ecological Modelling, Elsevier, vol. 220(20), pages 2624-2639.

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