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Assessing Breeding Populations of Ducks by Ground Counts

Table 12


Table 12. Mean population estimates of six dabbler species from five census periods in 1958. Kindersley Study Area. Vehicle census: 0800-1130 hours.
Early Nesters
Mallard Pintail
Census date Indicated population Census date Indicated population
4/24 182 4/24 174
4/29 187 4/29 172
5/3 198 5/3 181
5/10 191 5/10 161
5/21 212 5/21 150
Mean 194.0±12.9 Mean 167.6±13.5
Stand. Error 4.7 Stand. Error 4.9
Coef. Var. 5.4% Coef. Var. 6.5%
Intermediate nesters
Widgeon Shoveler
Census date Indicated population Census date Indicated population
5/10 35 5/10 35
5/21 55 5/21 40
5/24 56 5/24 35
5/31 41 5/31 30
6/6 32 6/6 30
Mean 43.8±12.4 Mean 34.0±4.6
Stand. Error 4.5 Stand. Error 1.7
Coef. Var. 22.8% Coef. Var. 11.0%
Late nesters
Gadwall Blue-winged teal
Census date Indicated population Census date Indicated population
5/21 42 5/21 23
5/24 26 5/24 35
5/31 24 5/31 34
6/6 27 6/6 44
6/12 21 6/12 22
Mean 28.0±7.0 Mean 31.6±10.2
Stand. Error 2.5 Stand. Error 3.7
Coef. Var. 20.3% Coef. Var. 26.0%
*95% confidence interval.

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