Relationship between shape index (shape projections from the TpsPls program) and swimming performance.

<p>Swimming performance is represented by a combination of acceleration and maximum swimming speed determined using a PCA. Grids on tadpole shapes show shape changes along the x-axis, and were generated with the thin-plate spline transformation in the program TpsRegr. The constant water level treatment is indicated by the solid line (y = 17.0x−0.2) and the decreasing water level treatment is indicated by the dashed line (y = 22.2x+0.1). Lower and upper confidence intervals for the regression coefficients are −0.0004 and 33.4, and 1.8 and 42.4 respectively.