Table 3.
Selection gradients and differentials for body size and arrival date, with standard error in parentheses. Sample sizes are contained in Table 1
| Linear | Quadratic | |||||
|---|---|---|---|---|---|---|
| Type | Sex | Year | Size | Date | Size2 | Date2 |
| Gradients | Males | 2003 | 0.0146 (0.285) | −0.672* (0.285) | −1.02* (0.216) | 1.27* (0.243) |
| 2004 | 0.398 (0.247) | −0.192 (0.247) | −0.110 (0.281) | −0.549 (0.199) | ||
| 2005 | 0.492 (0.270) | −0.0710 (0.270) | 0.490 (0.221) | 0.485 (0.150) | ||
| Females | 2003 | 0.749* (0.265) | −0.205 (0.265) | −0.543 (0.364) | 0.312 (0.322) | |
| 2004 | 0.4224 (0.136) | −0.0678 (0.136) | 0.113 (0.138) | −0.123 (0.106) | ||
| 2005 | 0.810* (0.362) | −0.196 (0.362) | 2.55** (0.348) | 1.04 (0.381) | ||
| Differentials | Males | 2003 | 0.0898 (0.294) | −0.674* (0.281) | −0.342 (0.220) | 1.00* (0.244) |
| 2004 | 0.404 (0.245) | −0.205 (0.254) | −0.105 (0.251) | −0.595 (0.193) | ||
| 2005 | 0.475 (0.260) | 0.0478 (0.268) | 0.401 (0.199) | 0.262 (0.135) | ||
| Females | 2003 | 0.638* (0.219) | 0.202 (0.273) | −0.374 (0.271) | −0.331 (0.232) | |
| 2004 | 0.422** (0.133) | −0.0699 (0.163) | −0.0164 (0.106) | −0.230 (0.0710) | ||
| 2005 | 0.670* (0.247) | 0.384 (0.287) | 1.23*** (0.143) | 0.353 (0.201) | ||
P-value from t-test for significance of predictor.
*
P < 0.05.
**
P < 0.01.
***
P < 0.001.