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Assessing Breeding Populations of Ducks by Ground Counts

Table 11


Table 11. Mean population estimates of six dabbler species from five census periods in 1956. Kindersley Study Area. Walking census: 0530 - 1100 hours.
Early Nesters
Mallard Pintail
Census date Indicated population Census date Indicated population
5/3 265 5/3 278
5/14 274 5/14 193
5/15 264 5/15 200
5/16 298 5/16 202
5/21 289 5/21 194
Mean 278.0±16.7* Mean 231.4±40.3
Stand. Error 6.0 Stand. Error 14.5
Coef. Var. 4.8% Coef. Var. 15.2%
Intermediate nesters
Widgeon Shoveler
Census date Indicated population Census date Indicated population
5/14 88 5/14 35
5/15 75 5/15 31
5/16 71 5/16 25
5/21 78 5/21 33
5/28 95 5/28 58
Mean 81.4±10.9 Mean 36.4±14.0
Stand. Error 3.9 Stand. Error 5.1
Coef. Var. 10.8% Coef. Var. 31.0%
Late nesters
Gadwall Blue-winged teal
Census date Indicated population Census date Indicated population
5/16 49    
5/21 41 5/21 45
5/28 50 5/28 51
6/4 46 6/4 39
6/11 55 6/11 49
Mean 48.2±5.7 Mean 46.0±10.3
Stand. Error 2.1 Stand. Error 3.2
Coef. Var. 9.6% Coef. Var. 10.0%
*95% confidence interval.

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