Estimated thermal enhancement effect of salmon shark endothermy on white muscle (WM) lactate dehydrogenase (LDH) activity
| . | . | . | . | No temperature adjustment* . | . | Temperature adjustment† . | . | ||
|---|---|---|---|---|---|---|---|---|---|
| Sector ID‡ . | Temperature elevation above ambient in each sector (°C) . | Percentage of total WM mass in each sector . | WM mass in each sector (kg) A . | Enzyme activity (IU g−1 WM) B . | Total LDH activity (IU) A × B . | Enzyme activity (IU g−1 WM) C . | Total LDH activity (IU) A × C . | ||
| 1 | 0-2 | 44 | 32.56 | 495 | 1.61×107 | 495 | 1.61×107 | ||
| 2 | 2-4 | 23.5 | 17.39 | 495 | 8.61×106 | 551 | 9.58×106 | ||
| 3 | 4-6 | 17.4 | 12.84 | 495 | 6.36×106 | 613 | 7.87×106 | ||
| 4 | 6-8 | 9.2 | 6.79 | 495 | 3.36×106 | 682 | 4.63×106 | ||
| 5 | 8-10 | 4.9 | 3.63 | 495 | 1.79×106 | 759 | 2.75×106 | ||
| 6 | 10-12 | 1.1 | 0.80 | 495 | 3.96×105 | 844 | 6.75×105 | ||
| Total=3.66×107 | Total=4.16×107 | ||||||||
| . | . | . | . | No temperature adjustment* . | . | Temperature adjustment† . | . | ||
|---|---|---|---|---|---|---|---|---|---|
| Sector ID‡ . | Temperature elevation above ambient in each sector (°C) . | Percentage of total WM mass in each sector . | WM mass in each sector (kg) A . | Enzyme activity (IU g−1 WM) B . | Total LDH activity (IU) A × B . | Enzyme activity (IU g−1 WM) C . | Total LDH activity (IU) A × C . | ||
| 1 | 0-2 | 44 | 32.56 | 495 | 1.61×107 | 495 | 1.61×107 | ||
| 2 | 2-4 | 23.5 | 17.39 | 495 | 8.61×106 | 551 | 9.58×106 | ||
| 3 | 4-6 | 17.4 | 12.84 | 495 | 6.36×106 | 613 | 7.87×106 | ||
| 4 | 6-8 | 9.2 | 6.79 | 495 | 3.36×106 | 682 | 4.63×106 | ||
| 5 | 8-10 | 4.9 | 3.63 | 495 | 1.79×106 | 759 | 2.75×106 | ||
| 6 | 10-12 | 1.1 | 0.80 | 495 | 3.96×105 | 844 | 6.75×105 | ||
| Total=3.66×107 | Total=4.16×107 | ||||||||
Morphological data: body mass, 148 kg; total WM mass, 74 kg; WM temperature directly under the skin, 10°C; deep WM temperature, 24°C.
Using the mean LDH activity at 10°C (495 IU g−1 WM)from Fig. 4;
mean LDH activity at 10°C (495 IU g−1 WM) from Fig. 4 adjusted by applying a mean Q10 of 1.70 (see Table 3); temperature-adjusted LDH activity is 13.6% higher relative to non-temperature adjusted LDH activity;
see Fig. 4.