Table 1.
Environmental characteristics of the rithron, transition, and potamon zones in the Andalién River, Chile during the wet season.
Fig 1.
Landmarks used in the analysis of shape of the lateral body view of T. areolatus.
Fig 2.
Landmarks used in the analysis of shape of the head of T. areolatus.
Fig 3.
Relative Warp least squares means for body.
Least squares means (error bars represent 95% confidence intervals of the mean) for each of 12 relative warps from the multivariate linear mixed model of body shape variation of T. areolatus. High-velocity environment is represented by closed circle symbols and solid connecting lines, and low-velocity environment is represented by open circle symbols and dashed connecting lines. Small and large ontogenetic stages are represented by centroid sizes of 35.00 and 150.00, respectively.
Fig 4.
Visualization of variation in body shape.
Thin plate spline deformations of divergence in body shape between high-velocity and low-velocity environments for large ontogenetic stage and small ontogenetic stage. Vertical arrows represent the direction of ontogenetic shape change from small to large. Horizontal arrows represent divergence between velocity environments.
Table 2.
Multivariate analysis of covariance effects for body shape and head shape.
Fig 5.
Relative warp least squares means for head.
Least squares means (error bars represent 95% confidence intervals of the mean) for each of 9 relative warps from the multivariate linear mixed model of head shape variation of T. areolatus. The high-velocity environment is represented by closed circle symbols and solid connecting lines, and the low-velocity environment is represented by open circle symbols and dashed connecting lines. Small and large ontogenetic stages are represented by centroid sizes of 5.00 and 20.00, respectively.
Fig 6.
Visualization of variation in head shape.
Thin plate spline deformations of divergence in head shape between high-velocity and low-velocity environments for large ontogenetic stage and small ontogenetic stage. Vertical arrows represent the direction of ontogenetic shape change from small to large. Horizontal arrows represent divergence between velocity environments.