Mean (± s.e.m.) proton leak rates at a membrane potential of 160 mV at 20°C and mean (± s.e.m.) mitochondrial densities in red muscle and liver of three shark species
| Tissue and species . | Proton leak rate (nmol H+ min−1mg−1 protein) . | Mitochondrial density [Vv(mt,f) or volume %] . |
|---|---|---|
| Red myotomal muscle | ||
| Isurus oxyrinchus (shortfin mako shark) | 20.0±4.0 | 40.8±1.3 (3; 9) |
| Prionace glauca (blue shark) | 23.5±2.4 * | 23.2±1.0 † (2; 10) |
| Triakis semifasciata (leopard shark) | 26.9±2.3 | 39.5±1.5 (1; 10) |
| Liver | ||
| Isurus oxyrinchus (shortfin mako shark) | 18.6±4.3 | 20.6±0.7 (2; 32) |
| Prionace glauca (blue shark) | 8.7±1.3 | 22.9±1.0 (1; 21) |
| Triakis semifasciata (leopard shark) | 15.6±2.9 | 12.7±0.9 † (2; 23) |
| Tissue and species . | Proton leak rate (nmol H+ min−1mg−1 protein) . | Mitochondrial density [Vv(mt,f) or volume %] . |
|---|---|---|
| Red myotomal muscle | ||
| Isurus oxyrinchus (shortfin mako shark) | 20.0±4.0 | 40.8±1.3 (3; 9) |
| Prionace glauca (blue shark) | 23.5±2.4 * | 23.2±1.0 † (2; 10) |
| Triakis semifasciata (leopard shark) | 26.9±2.3 | 39.5±1.5 (1; 10) |
| Liver | ||
| Isurus oxyrinchus (shortfin mako shark) | 18.6±4.3 | 20.6±0.7 (2; 32) |
| Prionace glauca (blue shark) | 8.7±1.3 | 22.9±1.0 (1; 21) |
| Triakis semifasciata (leopard shark) | 15.6±2.9 | 12.7±0.9 † (2; 23) |
For mitochondrial density measurements, the number of individual sharks sampled, followed by the number of TEM images analyzed, is indicated in parentheses.
Mean is significantly higher than liver mean for that species (paired t-test, P=0.02).
Mean differs significantly from those of the other two species (ANOVA, P<0.01).