Table 3.
Ranked generalised linear models of δ13C and δ15N for each tissue.
| Response | Model | df | AICc | Δ AICc | wAICc | %DE |
|---|---|---|---|---|---|---|
| Muscle | ||||||
| δ 13 C | lat + sex + TL + TL × lat | 6 | 237.9 | 0.00 | 0.76 | 65.29 |
| δ13C | lat + sex + TL | 5 | 241.4 | 3.57 | 0.13 | 63.01 |
| δ13C | lat + sex + lat × sex | 5 | 243.5 | 5.61 | 0.05 | 62.18 |
| δ13C | lat + sex + TL + sex × TL | 6 | 243.7 | 5.81 | 0.04 | 63.03 |
| δ13C | lat + season + sex + TL | 8 | 246.6 | 8.69 | 0.01 | 63.77 |
| δ13C | lat + TL | 4 | 247 | 9.13 | 0.00 | 59.74 |
| δ 15 N | lat | 3 | 250.5 | 0.00 | 0.34 | 7.65 |
| δ15N | lat + sex + lat × sex | 5 | 251.9 | 1.38 | 0.17 | 10.66 |
| δ15N | lat + sex | 4 | 252.6 | 2.10 | 0.12 | 7.74 |
| δ15N | lat + TL | 4 | 252.7 | 2.15 | 0.12 | 7.69 |
| δ15N | lat + sex + TL | 6 | 254.2 | 3.62 | 0.05 | 10.71 |
| δ15N | lat + sex + TL + lat × sex | 5 | 254.8 | 4.31 | 0.04 | 7.77 |
| Dermis | ||||||
| δ13C | location + TL | 4 | 121.8 | 0.00 | 0.42 | 34.85 |
| δ 13 C | TL | 3 | 122.7 | 0.86 | 0.28 | 27.93 |
| δ13C | location | 3 | 123.8 | 1.96 | 0.16 | 25.54 |
| δ13C | location + TL + TL × location | 5 | 124.0 | 2.22 | 0.14 | 35.89 |
| δ 15 N | location | 3 | 49.5 | 0.00 | 0.40 | 31.82 |
| δ15N | location + TL + TL × location | 5 | 49.8 | 0.23 | 0.36 | 41.34 |
| δ15N | location + TL | 4 | 50.8 | 1.23 | 0.21 | 34.42 |
| δ15N | TL | 3 | 55.3 | 5.76 | 0.02 | 19.22 |
| Red blood cells | ||||||
| δ 13 C | location + TL | 5 | 212.9 | 0.00 | 0.86 | 55.62 |
| δ13C | location + TL + TL × location | 7 | 216.6 | 3.73 | 0.13 | 56.72 |
| δ13C | location | 4 | 222.3 | 9.37 | 0.01 | 45.23 |
| δ13C | TL | 3 | 230.7 | 17.84 | 0.00 | 33.58 |
| δ 15 N | location | 4 | 78.6 | 0.00 | 0.72 | 15.93 |
| δ15N | Location + TL | 5 | 81.0 | 2.41 | 0.22 | 15.93 |
| δ15N | TL | 3 | 84.5 | 5.84 | 0.04 | 2.75 |
| δ15N | location + TL + TL × location | 7 | 85.9 | 7.25 | 0.02 | 16.37 |
| Plasma | ||||||
| δ 13 C | location + TL | 5 | 297.2 | 0.00 | 0.83 | 33.38 |
| δ13C | location + TL + TL × location | 7 | 300.8 | 3.69 | 0.13 | 34.29 |
| δ13C | location | 4 | 303.3 | 6.16 | 0.04 | 25.76 |
| δ13C | TL | 3 | 307.2 | 10.06 | 0.00 | 19.70 |
| δ 15 N | location | 4 | 218.2 | 0.00 | 0.66 | 8.66 |
| δ15N | location + TL | 5 | 220.5 | 2.26 | 0.21 | 8.69 |
| δ15N | TL | 3 | 222.2 | 3.95 | 0.09 | 1.13 |
| δ15N | location + TL + TL × location | 7 | 224.3 | 6.04 | 0.03 | 9.83 |
The top six models for each response are shown; values in bold indicate the top ranked model (or the most parsimonious model). Degrees of freedom (df), sample corrected Akaike’s Information Criterion (AICc), change in AICc relative to the model with the lowest AICc value (ΔAICc), relative AICc weight (wAICc) and percent deviance explained (DE%). Lat = latitude, TL = total length (cm).