Table 1.
Summer thermal regimes and cardiac phenotypes of six redband trout populations
| Popa | Body size | Cardiac phenotypesb | ||||||
|---|---|---|---|---|---|---|---|---|
| N | Weight (g) | Length (mm) | f h,max at 20°Cc (bpm) | Peak f h,max (bpm) | T AB d (oC) | T PEAK e (oC) | Q 10 f | |
| LJ | 17 | 14.4±1.1 | 114.0±3.6 | 149.0±1.6A | 161.4±2.6A | 20.7±0.2A (16) | 23.0±0.3 | 1.63±0.02B |
| BJ | 16 | 11.7±0.8 | 103.7±2.5 | 135.4±1.6B | 154.2±2.3A | 20.6±0.3A (13) | 23.2±0.3 | 1.68±0.03AB |
| KC | 22 | 10.0±0.6 | 100.1±2.2 | 127.3±2.2C | 143.6±3.0AB | 20.2±0.4A (16) | 22.5±0.4 | 1.79±0.04A |
| JC | 18 | 14.9±1.4 | 113.7±3.7 | 136.3±2.4B | 152.6±4.3A | 18.3±0.3BC (14) | 22.9±0.4 | 1.61±0.03B |
| UM | 18 | 4.6±0.4 | 76.7±1.7 | 121.5±1.6C | 132.2±2.4BC | 19.6±0.2AB (16) | 22.2±0.5 | 1.63±0.03B |
| FC | 23 | 3.3±0.2 | 69.1±1.5 | 112.8±2.0D | 125.4±3.4C | 17.7±0.4C (22) | 23.9±0.4 | 1.46±0.03C |
a
Redband trout populations, LJ: Little Jacks; BJ: Big Jacks; KC: Keithley; JC: Johnson; UM: Upper Mann; FC: Fawn.
b
All values are present as mean±s.e.m. Values with different superscripted uppercase letters are significantly different (p < 0.05).
c
f h,max at 20°C: maximum heart rate at 20°C.
d
T AB: Arrhenius Breakpoint temperature. Numbers in parentheses are sample size for T AB in each population.
e
T PEAK: Temperature for peak f h,max.
f
Q 10: temperature coefficient for f h,max during acute warming from 15°C to T PEAK.