Figure 1.
Landmark locations and measurements of sword length (SL) and dorsal fin area (DFA, shaded area).
Figure 2.
Means and standard errors for fast-start velocity (A) and time to fatigue (B) by species-type.
Letters and lines indicate similarities between means determined using Tukey’s HSD.
Figure 3.
Importance of morphological variables in predicting fast-start velocity (A) and time to fatigue (B) in hybrids.
Figure 4.
The relationship between body shape PC 3 (BSPC3) and fast-start velocity in hybrids.
Table 1.
Results for the best supported models (ΔAICc<2) predicting fast-start velocity.
Figure 5.
Performance landscapes for the significant interaction effects of log sword length by body shape PC 1 (BSPC1; A), log sword length by body shape PC 3 (BSPC3; B) and body shape PC 1 body shape by body shape PC 3 (C).
Red represents longer endurance time.
Table 2.
Results for the best supported model (ΔAICc<2) predicting time to fatigue.
Figure 6.
Performance landscape showing variation in morphology and swimming performance between parentals (X. malinche and X. birchmanni) and between hybrids that exhausted and hybrids that did not.
Red represents longer endurance time. Means and standard errors of residual PC 1 and residual PC 2 for hybrids (A and C) and parentals (B and D) are shown. Morphometric visualizations were magnified by a factor of 3 [83]–[85].