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Logo of bmcbiologyBioMed Centralsearchsubmit a manuscriptregisterthis articleBMC Biology
BMC Biol. 2012; 10: 21.
Published online Mar 12, 2012. doi:  10.1186/1741-7007-10-21
PMCID: PMC3299606
A novel approach for finding ring species: look for barriers rather than rings
Darren E Irwincorresponding author1
1Biodiversity Research Centre and Department of Zoology, University of British Columbia, 6270 University Blvd, Vancouver, BC, V6T 1Z4, Canada
corresponding authorCorresponding author.
Darren E Irwin: irwin/at/
Received February 23, 2012; Accepted March 12, 2012.
Ring species, in which two different forms coexist in one region while being connected by a long chain of interbreeding populations encircling a geographic barrier, provide clear demonstrations of the evolution of one species into two. Known ring species are rare, but now Monahan et al. propose an intriguing new approach to discovering them: focus first on geography to find potential barriers.
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