Table 1.
Model selection results (displayed are selected models with ΔAIC < 4, and null model) for effect of colony identity (Pacific or Atlantic colony), type of implant (CORT or control) and food treatment (unfed or fed) on baseline CORT and adult nest attendance. Effects of food treatment analysed for the Pacific colony only (food comparison). Indicated in italics is the interaction model that supports the study hypothesis. d.f., degrees of freedom; AICc, AIC corrected for finite sample size; ΔAIC, difference between the AICc of this model and the AICc of the best model; wi, ratio of AICc values for this model relative to the whole set of candidate models (weight); e.r., evidence ratio describing the relative weight of this model against the best model.
| response variable | model | d.f. | AICc | ΔAICc | wi | e.r. |
|---|---|---|---|---|---|---|
| colony comparison | ||||||
| baseline CORT | implant + colony + impl × col | 5 | 536.9 | 0.00 | 1.000 | 1.0 |
| (null model) | 2 | 549.9 | 13.03 | — | — | |
| nest attendance | implant + colony + impl × col | 5 | –8.4 | 0.00 | 0.769 | 1.0 |
| implant | 3 | –6.0 | 2.41 | 0.231 | 3.3 | |
| (null model) | 2 | –1.4 | 6.94 | — | — | |
| food comparison | ||||||
| baseline CORT | implant | 3 | 334.1 | 0.00 | 0.740 | 1.0 |
| implant + food | 4 | 336.2 | 2.09 | 0.260 | 2.8 | |
| (null model) | 2 | 340.9 | 6.88 | — | — | |
| nest attendance | implant | 3 | –15.5 | 0.00 | 0.734 | 1.0 |
| implant + food | 4 | –13.5 | 2.03 | 0.266 | 2.8 | |
| (null model) | 2 | –3.1 | 12.43 | — | — | |