Fig. 3.

(A–C) Absolute wet masses of major visceral organs at hatching and 3 months later: (A) liver, (B) lungs and (C) heart. All organs are significantly smaller in hypoxic alligators at both ages (ANOVA with post hoc Tukey–Kramer test, ^*P<0.05). Symbols and error bars indicate the mean ± s.e.m. (D–F) Ontogenetic allometry of major visceral organs in alligators reared under hypoxia, normoxia and hyperoxia. (D) Liver scales to M_b^0.80 (M_b, body mass) in all groups, but is significantly smaller in hypoxic animals. (E) Lungs scale similarly (M_b^0.73) in normoxia and hyperoxia, but exhibit a significantly steeper slope (M_b^1.44) in the hypoxic group. (F) Heart scales with slight positive allometry (M_b^1.07) in all groups, but is significantly larger in hypoxic alligators.