Table 1.
GLMM analyses of age-corrected mass and breeding values for mass
| Environmental effect | Age-corrected body mass (NObservations = 3,417/NHatching years = 45) |
Breeding values for body mass (NObservations = 3,283/NHatching years = 43) |
||||
|---|---|---|---|---|---|---|
| df | F | P | df | F | P | |
| Time trend | ||||||
| Hatching year | 1/43 | 27.26 | <0.0001 | 1/41 | 0.005 | 0.946 |
| Sex | 1/3,370 | 14,413.13 | <0.0001 | 1/3,238 | 0.056 | 0.812 |
| Sex:Hatching year | 1/3,370 | 1.57 | 0.210 | 1/3,238 | 0.036 | 0.849 |
| Temperature anomaly | ||||||
| Anomaly | 1/43 | 4.89 | 0.032 | 1/41 | 0.789 | 0.380 |
| Sex | 1/3,370 | 14,408.46 | <0.0001 | 1/3,238 | 0.042 | 0.837 |
| Sex:Anomaly | 1/3,370 | 0.02 | 0.896 | 1/3,238 | 0.098 | 0.754 |
Breeding values for mass are estimated from an animal model containing individual and permanent environment effects. Time trends in phenotypic and breeding values were assessed against the hatching year of the birds. Shown also is the effect of temperature anomaly on body mass.