Table 3. Reduced major axis regressions between feather growth-rate by mass and feather-length, between feather growth-rate by length and feather-length, as well as between feather mass and feather-length.
| Intercept | 95% CI | Slope | 95% CI | R2 | |
|---|---|---|---|---|---|
| Longest primary of 27 species | |||||
| log(growth-rate by mass) ~ log(feather-length) | -1.545 | -1.985, -1.139 | 2.344* | 2.155, 2.548 | 0.961 |
| log(growth-rate by length) ~ log(feather-length) | -0.392 | -0.673, -0.163 | 0.482-- | 0.376, 0.613 | 0.744 |
| log(feather mass) ~ log(feather-length) | -4.222 | -4.535, -3.924 | 2.895-- | 2.756, 3.041 | 0.986 |
| Remiges of Golden Eagle | |||||
| log(growth-rate by mass) ~ log(feather-length) | -0.600 | -0.811, -0.404 | 1.447* | 1.321, 1.584 | 0.920 |
| log(growth-rate by length) ~ log(feather-length) | -0.853 | -1.081, -0.671 | 0.462-- | 0.343, 0.609 | 0.544 |
| log(feather mass) ~ log(feather-length) | -2.847 | -2.984, -2.715 | 2.050* | 1.965, 2.139 | 0.981 |
| Primaries of 6 passerine species | |||||
| log(growth-rate by mass) ~ log(feather-length) | -4.011 | -4.606, -3.499 | 2.075* | 1.811, 2.384 | 0.801 |
| log(growth-rate by length) ~ log(feather-length) | -0.329 | -1.245, 0.312 | 0.426* | 0.094, 0.901 | 0.093 |
| log(feather mass) ~ log(feather-length) | -3.721 | -3.981, -3.474 | 2.669* | 2.541, 2.804 | 0.969 |
* = slope is significantly different (P < 0.001) from 3 (in the case of growth-rate by mass against feather-length and feather mass against feather-length), or from 0.5 (in the case of growth-rate by length against feather-length);