Assessing Breeding Populations of Ducks by Ground Counts
Table 3
Table 3. Sex ratios of ducks, 1956 to 1959, Kindersley Study Area. From counts taken of spaced birds (not migrating flocks) before the first clutches were found.
| Year | Mallard | Pintail | Widgeon | Gadwall | Shoveler | Blue-winged teal | Green-winged teal | Canvasback | Redhead | Lesser Scaup | Ruddy duck | |||||||||||
| No. | % male | No. | % male | No. | % male | No. | % male | No. | % male | No. | % male | No. | % male | No. | % male | No. | % male | No. | % male | No. | % male | |
| 1956 | 364 | 54 | -- | -- | 179 | 50 | 319 | 53 | 35 | -- | 113 | 52 | 94 | 51 | 15 | -- | 98 | 51 | 807 | 55 | 59 | 58 |
| 1957 | -- | -- | -- | -- | 312 | 51 | 98 | 51 | 196 | 56 | 225 | 56 | 100 | 57 | 72 | 68 | 139 | 66 | 785 | 59 | -- | -- |
| 1958 | 310 | 52 | 393 | 55 | 550 | 53 | 181 | 53 | 148 | 53 | 80 | 54 | 352 | 54 | 24 | -- | 171 | 57 | 1133 | 63.5 | 97 | 53 |
| 1959 | 358 | 53 | 235 | 53 | 493 | 52 | 175 | 51 | 184 | 54 | 104 | 54 | 135 | 55 | 65 | 55 | 370 | 56 | 2003 | 63.2 | 435 | 66 |
| Total | 1032 | 52.8 | 628 | 54 | 1534 | 51.9 | 773 | 52 | 563 | 54 | 522 | 55 | 681 | 54 | 176 | 61 | 778 | 57 | 4728 | 61.1 | 591 | 63 |
| 95% con. int. | ± 3.0 | ± 4 | ± 2.6 | ±4 | ± 5 | ± 5 | ± 4 | ± 7 | ± 4 | ± 1.4 | ± 4 | |||||||||||
| Mean ratio M;F this study | 112:100 | 117:100 | 108:100 | 110:100 | 119:100 | 120:100 | 110:100 | 159:100 | 134:100 | 157:100 | 172:100 | |||||||||||
| Bellrose et al.* (1961:428) | 105:100 | 119:100 | 129:100 | 112:100 | 123:100 | 133:100 | 121:100 | 174:100 | 127:100 | 195:100 | 211:100 | |||||||||||
| Bellrose et al.^ (1961:416) | 117:100 | 142:100 | 116:100 | 121:100 | 139:100 | 117:100 | 115:100 | 132:100 | 111:100| 154:100 |
| | |||||||||||
| *Recalculated from Table 34, for Saskatchewan, Minnesota,
Manitoba, and North Dakota. ^Recalculated from Table 27, for Manitoba, April 21 or April 29 to May 7. |
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