Table 4.
Effects of clutch size (C) on duration of nesting period (laying (Lay), incubation (Inc), and total; in days), daily nest survival rate (DSR), mayfield nesting success (N), partial clutch survival (P), hatchability (H), (minimum) chick survival (until age = 10 days; S10), and cumulative reproductive value (R = C x N x P x H; R2 = C x N x P x H x S10)10. Difference (Diff) refers to percent increase or decrease in reproductive value of enlarged clutches, with and without chick survival included. Setup of table is modified from Arnold10.
| C | Duration | N2 | P | H | S10 | R | R2 | Diff (R) | Diff (R2) | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lay1 | Inc1 | Total | DSR | |||||||||
| 4 | 6.5 | 23.3 | 29.8 | 0.986 | 0.657 | 1.000 | 0.969 | 0.789 | 2.546 | 2.010 | ||
| 5 | 8.7 | 26.3 | 35.0 | 0.988 | 0.655 | 0.977 | 0.897 | 0.513 | 2.872 | 1.473 | 11% | − 36% |
1: Estimates from Wallander and Andersson28, 2: N = DSRn, where n = total duration of the nesting period.