Figure 4.

The top 100 candidate cohesive barriers. Candidates are topographically similar to the reference barrier for the Drakensberg Massif (South Africa), which has promoted ring diversification in the tree species Acacia karroo, and to the reference barrier for the Central Valley, California (USA), which has promoted ring diversification in the salamander species Ensatina eschscholtzii.

Monahan et al. BMC Biology 2012 10:20   doi:10.1186/1741-7007-10-20
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