Figure 3 in The common bottlenose dolphin (Tursiops truncatus) ecotypes of the western North Atlantic revisited: an integrative taxonomic investigation supports the presence of distinct species

Figure 3. Three-dimensional geometric morphometric (GM) analyses of bottlenose dolphins of the western North Atlantic. A, allometry plot of predicted lines based on fitted values (unique allometries model) to visualize how shape allometry varies by ecotype. The PredLine method calculates fitted values from the procD.lm fit and plots the first principal component of the predicted values against size, i.e. lnCS (see Adams & Nistri, 2010). B, scatter plot of the principal component 1 (PC1) and 2 (PC2) scores based on 23 cranial landmarks and 90 samples. Ellipses correspond to the 95% confidence interval. Samples are differentiated by sex (F, female; M, male; U, unknown) and ecotype. The mean specific shape variation along PC1 (bottom right) and PC2 (top left) is also shown. Grey represents the mean shape, whereas black represents the change in shape from the mean shape. Sample 1, USNM504096; sample 2, USNM572261.