Table 1.
Differences in life-history parameters among the selection lines as estimated by the biphasic growth model
| Trait | Selection line | Parameter estimates (SE) | Chi-square value* (df) | P-value |
|---|---|---|---|---|
| Juvenile growth rate (h; mm) | Large | 0.167 (0.013) | 4.8999 (3,5) | 0.0863 |
| Random | 0.194 (0.012) | |||
| Small | 0.189 (0.013) | |||
| Maximum length (L∞; mm) | Large | 29.53 (0.592) | 29.946 (3,4) | <0.0001 |
| Random | 29.24 (0.371) | |||
| Small | 27.37 (0.398) | |||
| Age at maturity (T; d) | Large | 106.2 (3.001) | 12.490 (3,4) | <0.0001 |
| Random | 94.14 (4.027) | |||
| Small | 91.27 (4.315) | |||
| Length at maturity (L; mm) | Large | 22.89 (0.449) | 0.9742 (3,4) | <0.0001 |
| Random | 22.61 (0.300) | |||
| Small | 21.15 (0.322) | |||
| Daily reproductive investment (g) | Large | 0.017 (0.001) | 6.4809 (3,4) | 0.0109 |
| Random | 0.020 (0.001) | |||
| Small | 0.021 (0.002) |
Parameter estimates for each treatment for each trait are shown. P-values were derived from chi-square statistics. The selection line differing significantly from the other treatments is indicated in bold.
*
Chi-square value from the deletion of the variable from the full model.