Basal metabolic rate (BMR) of snow petrels in relation to different explanatory variables
| . | d.f. . | F . | P . | r2 . | Estimate (s.e.m.) . |
|---|---|---|---|---|---|
| Final model | |||||
| Body mass | 1,61 | 85.6 | <0.0005 | 0.58 | +0.68 (0.074) |
| Body condition | 1,61 | 5.9 | 0.02 | 0.09 | +0.00052 (0.0002) |
| Cosine(time of BMR) | 1,61 | 4.0 | 0.05 | 0.06 | +0.021 (0.011) |
| Rejected terms | |||||
| Sex (Females vs Males) | 1,60 | 1.2 | 0.27 | 0.02 | –0.012 (0.011) |
| Measurement (`Day' vs`Night')c | 1,59 | 0.7 | 0.40 | 0.01 | –0.009 (0.011) |
| Sex × Body mass | 1,58 | 0.7 | 0.42 | 0.01 | |
| Sex × Body condition | 1,57 | 0.0 | 0.93 | 0.00 |
| . | d.f. . | F . | P . | r2 . | Estimate (s.e.m.) . |
|---|---|---|---|---|---|
| Final model | |||||
| Body mass | 1,61 | 85.6 | <0.0005 | 0.58 | +0.68 (0.074) |
| Body condition | 1,61 | 5.9 | 0.02 | 0.09 | +0.00052 (0.0002) |
| Cosine(time of BMR) | 1,61 | 4.0 | 0.05 | 0.06 | +0.021 (0.011) |
| Rejected terms | |||||
| Sex (Females vs Males) | 1,60 | 1.2 | 0.27 | 0.02 | –0.012 (0.011) |
| Measurement (`Day' vs`Night')c | 1,59 | 0.7 | 0.40 | 0.01 | –0.009 (0.011) |
| Sex × Body mass | 1,58 | 0.7 | 0.42 | 0.01 | |
| Sex × Body condition | 1,57 | 0.0 | 0.93 | 0.00 |
The model is obtained with a GLMa, and non-significant variables are stepwise excluded one by one. Values of rejected terms are those before they were excluded from the model. N=65b
The GLM was performed with log10-transformed BMR as dependent variable and with log10-transformed body mass (g), body condition(see Materials and methods) and cosine of the time (in rad, see Materials and methods) when BMR was obtained as covariates, and with measurement (`day'vs `night' measurements) and sex as factors
We had BMR data on 67 snow petrels, but two individuals had missing data on structural body size, which was used to calculate body condition
`Day' and `Night' refer to measurements that were started during the day(at 11:30 h) and during the night (at 22:10 h), respectively