TABLE 2.
Parameter values for the logistic mortality model, u(t) = aebt/[1 + (as/b)(ebt − 1)], for inbred and outbred females of Callosobruchus maculatus
| Parameter estimatesa (95% confidence intervals)
|
|||
|---|---|---|---|
| a (×10−3) | b | s | |
| Burkina Faso (BF) | |||
| Inbred | 0.15 (0.07–0.29) | 0.725 (0.650–0.809) | 1.798 (1.475–2.193) |
| Outbred | 0.14 (0.08–0.26) | 0.632 (0.576–0.694) | 1.384 (1.142–1.679) |
| Likelihood-ratio test (inbred vs. outbred) | NS | Inbred > outbred, P = 0.05 | NS |
| South India (SI) | |||
| Inbred | 0.58 (0.34–0.98) | 0.527 (0.469–0.592) | 1.638 (1.311–2.046) |
| Outbred | 1.08 (0.76–1.54) | 0.379 (0.347–0.414) | 0.923 (0.736–1.159) |
| Likelihood-ratio test (inbred vs. outbred) | Inbred < outbred, P < 0.001 | Inbred > outbred, P < 0.001 | Inbred > outbred, P = 0.009 |
a, the initial mortality rate; b, the rate of exponential increase in mortality at young ages; s describes the degree of deceleration in mortality with increasing age; NS, not significant, P > 0.05.
a
Results are presented for replicate 2 only; sample sizes for replicate 1 were small and thus 95% confidence intervals on parameter estimates were very large.