Figure 5
Phenotype-environment correlations for selected (significant) trait interactions, regression lines are produced using the Phylogenetic Generalized Least Squares (PGLS) model.
Species mean values for centroid size and PC (axes 1 or 2) scores from a PCA of operculum shape data were plotted against mean values for: (A) δ15N, which is a proxy for trophic level wherein larger values reflect a higher trophic position; (B,C) gut length standardized by total length (GLTL); (D) Elongation Ratio (ER) and (E) Elongation Ratio for specimens belonging to the extinct species flock of saurichthyids (denoted by ϯ). A generalized sketch of the elongate body plan of saurichthyids is shown (modified from27) and inset a photograph of S. macrocephalus T4106 (Paläontologisches Institut und Museum, Zürich; photo: Rosi Roth). The dashed line indicates the position of the operculum, highlighted inset by a colored outline.
