Figure 2.

Patterns of variation in PC1 and PC3 in allopatric and sympatric populations of nightingales. Nightingales have converged in PC1 and diverged in PC3 in sympatry. Means ± 95% confidence intervals are shown.

Reifová et al. BMC Evolutionary Biology 2011 11:138   doi:10.1186/1471-2148-11-138
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