Table 1. Comparison of nesting areas in control and impacted river sections before and after reservoir filling.
Results from GLM used to explain the variation in the number of nesting areas per km of river, recorded before (2011, 2015) and after (2016) hydropower reservoir filling. Nesting area surveys were conducted along 33 km in both control (61–94 km upstream) and directly impacted (12–45 km upstream) river sections in all years.
| Source of variation | Actual nesting areas per kilometer | |||
|---|---|---|---|---|
| Estimate | SE | T value | Pa | |
| (Intercept) | 1.08 | 0.05 | 21.90 | <0.001 |
| Before-after (compared with 2011) | ||||
| 2015 | −0.04 | 0.06 | −0.66 | 0.519 |
| 2016 | 0.01 | 0.07 | 0.18 | 0.857 |
| Control-impact (impact vs control) | 0.05 | 0.08 | 0.68 | 0.506 |
| Interaction (Before-after: control-impact) | ||||
| 2015: impact | 0.02 | 0.10 | 0.25 | 0.804 |
| 2016: impact | 0.37 | 0.14 | 1.89 | 0.041 |
| Observations | 30 | |||
| Model deviance explained (%) | 37.0 | |||
| Model Pb | 0.0398 | |||
Notes.
a
Factor P values obtained from comparison against the t statistic probability distribution.
b
Model P value obtained from comparison against single factor (control-impact) null model.