Table 3.
Peak ICa density and charge transfer (QCa), cell capacitance and the change in total cellular [Ca2+] (Δ[Ca2+]) expressed as a function of non-mitochondrial volume of Alaska blackfish ventricular cardiomyocytes at low (5°C) and high (15°C) acclimation temperatures and following acute exposure to 10°C.
| Treatment | Peak ICa density (pA pF−1) | QCa (pC) | Cell capacitance (pF) | Normalized QCa (pC pF−1) | Δ[Ca2+] (μmol l−1) | N |
|---|---|---|---|---|---|---|
| 5°C-acclimated | −1.1±0.1a | −3.8±0.6a | 26.2±2.3 | −0.142±0.01a | 27.4±2.0a | 13 (9 fish) |
| 10°C acute from 5°C | −2.3±0.4* | −7.0±1.0* | 25.0±1.5 | −0.279±0.03* | 53.9±5.9* | 7 (5 fish) |
| 10°C acute from 15°C | −4.1±0.5* † | −7.3±1.3* | 21.0±2.6 | −0.343±0.04* | 66.1±7.3* | 6 (3 fish) |
| 15°C-acclimated | −8.8±0.6b | −15.7±2.3b | 26.1±2.9 | −0.585±0.06b | 112.9±12.5b | 10 (6 fish) |
Dissimilar letters indicate a significant difference (P<0.05) between 15°C and 5°C acclimation groups (unpaired t-tests).
An asterisk (*) indicates a statistically significant effect (P<0.05) of acute exposure to 10°C from an acclimation temperature (paired t-tests).
A dagger (†) indicates a significant difference (P<0.05) between 15°C and 5°C acclimation groups after acute exposure to and recording at 10°C (unpaired t-tests).
Values are means ± S.E.M.