Figure 6
From: The vocal organ of hummingbirds shows convergence with songbirds
Species-level analysis of hummingbird syrinx morphology (nâ=â18 birds). (a) Schematic of the syrinx measurements used in a representative serial section, for (a) top syrinx diameter, (b) bottom syrinx diameter, (c) pessulus height, (d) pessulus width, (e) length of cartilage B1, (f) mean tympanum height, (g) mean muscle diameter, (h) mean muscle length and (i) is the MTM length (the only curvilinear measurement). (b) Individual character measurements for each species, where different letters represent honestly significant differences from post-hoc Tukey tests for each trait independently. Quartile differences are represented by box-whisker plots and female samples are denoted by âFâ. Y-axes are in Îĵm. (c) Eigenvalues from a correlation-based PCA of the 9 characters in this analysis. (d) Eigenvectors with heavily loading characters represented as bold text within each vector. (e) Biplot of PC 1 versus PC 2. Species are represented by different colors clustered around the abbreviation for each species, and females are represented by âFâ.
