TABLE 7.
Summary of a standardized major axis regression (sma) used to fit the metabolic scaling relations between ln (VCO2) and ln (mass), and to test for effects of rearing season on metabolic rate (MR) within populations.
| Population, trait | Season | H0: Equal slopes slope (95% CI) a | H0: no elevation difference Y‐intercept b |
|---|---|---|---|
| Costa Rica, resting MR |
LR = 0.03, df = 1, p = .86 Common slope: 2.84 (2.41, 3.34) |
Wald = 30.96, df = 1, p = 2.63E−08 | |
| Autumn | 0.81* (0.41, 1.16) | ||
| Summer | 0.56* (0.31, 0.83) | ||
| N. America, resting MR |
LR = 0.35, df = 1, p = .55 Common slope: 3.34 (2.86, 3.89) |
Wald = 0.78, df = 1, p = .37 | |
| Autumn | 0.89 (0.66, 1.12) | ||
| Summer | 0.84 (0.62, 1.06) | ||
| Costa Rica, max flight MR |
LR = 1.79, df = 1, p = .19 Common slope: 2.20 (1.85, 2.61) |
Wald = 4.13, df = 1, p = .04 | |
| Autumn | 2.25* (1.95, 2.55) | ||
| Summer | 2.12* (1.87, 2.37) | ||
| N. America, max flight MR |
LR = 0.00, df = 1, p = .97 Common slope: 2.03 (1.70, 2.42) |
Wald = 1.69, df = 1, p = .19 | |
| Autumn | 1.89 (1.73, 2.05) | ||
| Summer | 1.84 (1.69, 1.99) |
Note: *p < .05; **p < .01; ***p < .001.
a
Test of common slope from a Type II regression model.
b
Significant differences in y‐intercept within a common slope are evidence of differences in MR across the range of masses measured.