Assessing Breeding Populations of Ducks by Ground Counts
Table 4
Table 4. Seasonal changes in sex ratios of migrating lesser scaup, 1958 and 1959, Kindersley Study Area.
| Dates | Migration and prebreeding period | Breeding and postbreeding period | ||||||
| April 19 to May 3 | May 10 to 15 | May 24 to June 6 | June 12 to 26 | |||||
| Year | Number | % drakes | Number | % drakes | Number | % drakes | Number | % drakes |
| 1958* (95% con. int.) |
870 | 63 (±3) |
346 | 63 (±5) |
315 | 73 (±5) |
393 | 86 (±3) |
| Dates | April 21 to May 8 | May 11 to 15 | May 28 to June 4 | June 12 to 17 | ||||
| Year | Number | % drakes | Number | % drakes | Number | % drakes | Number | % drakes |
| 1959* (95% con. int.) |
861 | 67 (±3) |
1,142 | 60.1 (±2.9) |
439 | 71 (±5) |
270 | 84 (±5) |
| *Sex ratio sig. diff. p = <.05. Bother periods chi square, 1958 = 25.3, 1959 = 24.5, 1 d.f. | ||||||||
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