| Total bacterial densities | Keratinolytic bacterial densities | ||||||
---|---|---|---|---|---|---|---|---|
Nests | Estimate ± SE | Df | T | P | Estimate ± SE | Df | T | P |
  TSB | 0.87 ± 0.38 | 32 | 2.30 | 0.028* | 1.36 ± 0.62 | 32 | 2.19 | 0.036* |
  Nisin | −1.70 ± 0.46 | 33 | −3.67 | <0.001*** | −2.68 ± 0.73 | 33 | −3.65 | <0.001*** |
Feathers | Estimate ± SE | Df | T | P | Estimate ± SE | Df | T | P |
  TSB | 1.64 ± 0.61 | 36 | 2.69 | 0.011* | 2.53 ± 0.52 | 37 | 4.90 | <0.001*** |
  Nisin | 0.87 ± 0.39 | 34 | 2.20 | 0.035* | 0.99 ± 0.41 | 35 | 2.43 | 0.021* |
 | Bacterial diversity | Bacterial composition | ||||||
Nests | Estimate ± SE | Df | T | P | SumSq | Df | F | P |
  TSB | 0.60 ± 0.28 | 30 | 2.14 | 0.040* | 0.80 | 30 | 3.59 | 0.005** |
  Nisin | −0.01 ± 0.29 | 30 | −0.02 | 0.981 | 0.16 | 30 | 0.65 | 0.715 |
Feathers | Estimate ± SE | Df | T | P | SumSq | Df | F | P |
  TSB | 0.41 ± 0.25 | 37 | 1.62 | 0.113 | 1.17 | 37 | 7.26 | 0.002** |
  Nisin | −0.07 ± 0.32 | 35 | −0.23 | 0.82 | 0.08 | 35 | 0.51 | 0.767 |