Additional file 5.

Use of the topographic ring model to identify candidate taxa for ring diversification around a focal barrier in Costa Rica and Panama that is topographically similar to the reference barrier for the Central Valley (California, USA), which has promoted ring diversification in a salamander, Ensatina eschscholtzii. A: The focal barrier is a long-standing geographic feature known as the Cordillera de Talamanca. B: As a result of its particular topography, the mountainous barrier is surrounded at lower elevations by higher temperatures. C: In part due to these temperature gradients, the predicted barrier is considered a distinct ecoregion (Talamancan Montane Forests) that is surrounded by other distinct ecoregions, which form a ring distribution. D: These climatic and ecoregional conditions have shaped the distribution of many species, including the red-eyed tree frog, Agalychnis callidryas.

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