Table 1.
Regression ( R 2 ) values between hybrid index and phenotypic traits within and outside the hybrid zone
| Trait | All | Transect | Core hybrid |
|---|---|---|---|
| Wing |
0.04* |
ns |
ns |
| Tail |
ns |
ns |
ns |
| Tarsus |
ns |
ns |
ns |
| Bill length |
ns |
ns |
ns |
| Bill depth |
ns |
ns |
ns |
| Bill width |
0.11*** |
ns |
ns |
| Morph PC11 |
ns |
ns |
ns |
| Morph PC22 |
0.06** |
ns |
ns |
| Morph PC33 |
0.05** |
ns |
ns |
| Collar |
0.38*** |
0.23** |
ns |
| Vent |
0.51*** |
0.46*** |
0.36*** |
| Eyestripe | 0.31*** | 0.25*** | 0.37*** |
1PC1 describes general size.
2PC2 describes a trade-off between body and bill size.
3PC3 describes a trade-off between bill length and bill width.
ns = not significant, *p < 0.05, **p < 0.01, ***p < 0.001.