Figure 5From: A phylogeographic break and bioacoustic intraspecific differentiation in the Buff-barred Warbler (Phylloscopus pulcher) (Aves: Passeriformes, Phylloscopidae) Principal-component analysis: scatterplots of PC1 vs. PC2 (left) and PC1 vs. PC3 respectively (right) for 28 individual trill songs. PC1 increases with speed of trill, frequency range and maximum frequency descent. (White circle) = Nepal, (grey circle) = China.Back to article page