TABLE 1.
Top models ranked by ∆AICc values where ∆AICc values were < 4.
| Models | ∆AICc | Degrees of freedom | Weight |
|---|---|---|---|
| δ 15 N models | |||
| δ15N ~ IDZ + feather | 0 (AICc = 135.4) | 5 | 0.202 |
| δ15N ~ IDZ | 0.07 | 4 | 0.196 |
| δ15N ~ IDZ + population | 0.78 | 6 | 0.137 |
| δ15N ~ IDZ + population + population:IDZ | 0.87 | 8 | 0.131 |
| δ15N ~ IDZ + population + feather | 0.92 | 7 | 0.128 |
| δ15N ~ IDZ + population + feather + population:IDZ | 1.01 | 9 | 0.122 |
| δ15N ~ IDZ + feather + feather:IDZ | 2.61 | 6 | 0.055 |
| δ15N ~ IDZ + population + feather + feather:IDZ | 3.81 | 8 | 0.03 |
| δ 13 C models | |||
| δ13C ~ population + IDZ | 0 (AICc = 123.8) | 6 | 0.673 |
| δ13C ~ population + IDZ + feather | 2.35 | 7 | 0.208 |
| δ13C ~ population + IDZ + population:IDZ | 3.47 | 8 | 0.119 |
Note: The ∆AICc column shows the number of AICc units away from the best fitting model that each model was. ‘IDZ’ represents the proportion of intra‐depth zone dives, ‘feather’ represents feather type (secondaries or coverts) and interactions are denoted by colons between variables.