TABLE 9.
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 the effects of population on metabolic rate (MR) within seasons.
| Season, trait | Population | H0: Equal slopes slope (95% CI) a | H0: no elevation difference Y‐intercept b |
|---|---|---|---|
| Summer, resting MR |
LR = 0.53, df = 1, p = .46 Common slope: 3.03 (2.62, 3.51) |
Wald = 2.82, df = 1, p = .09 | |
| N. America | 0.72 (0.53, 0.91) | ||
| Costa Rica | 0.64 (0.44,0.84) | ||
| Autumn, resting MR |
LR = 1.68, df = 1, p = .19 Common slope: 3.18 (2.67, 3.81) |
Wald = 6.597, df = 1, p = .01) | |
| N. America | 0.82* (0.62, 1.31) | ||
| Costa Rica | 0.97* (0.41, 1.16) | ||
| Summer, max flight MR |
LR = 1.01, df = 1, p = .31 Common slope: 2.20 (1.85, 2.61) |
Wald = 0.10, df = 1, p = .74 | |
| N. America | 1.91 (1.75, 2.06) | ||
| Costa Rica | 1.92 (1.75, 2.09) | ||
| Autumn, max flight MR | LR = 4.09, df = 1, p = .04 | ||
| N. America | 2.02 (1.53, 2.67) | ||
| Costa Rica | 3.28 (2.24, 4.79) |
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.