Table 3.
Mean (standard deviation) and percent dimorphism of bill measurements (mm) for the Alameda sparrow (117♂, 81♀). Bolded P values indicate significance with an alpha = 0.0125, with a Bonferroni correction for a desired alpha = 0.05
| Feature | ♂ | ♀ | % dimorphism (95% CI) | t-value | P |
|---|---|---|---|---|---|
| Premaxillar Length | 6.87 (0.34) | 6.69 (0.32) | 2.75 (1.70 to 3.70) | 3.76 | 0.000 |
| Skeletal Bill Depth | 4.34 (0.26) | 4.37 (0.30) | −0.79 (−2.07 to 0.49) | −0.85 | 0.396 |
| Bill Tip Length | 1.92 (0.26) | 1.69 (0.26) | 13.52 (10.09 to 16.95) | 6.03 | 0.000 |
| Tomium Depth | 1.80 (0.19) | 1.63 (0.19) | 10.19 (7.73 to 12.65) | 6.00 | 0.000 |