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Assessing Breeding Populations of Ducks by Ground Counts

Table 13

Table 13. Census of six dabbler species on 3 days of the same week, Kindersley Study Area, 1959.
  CST hours Indicated populations from ground count
Mallard Pintail Widgeon Shoveler Gadwall Blue-winged teal Total population
May 11 0800 176 58 52 24 21 9 340
1300 167 41 42 33 29 9 321
1800 178 45 47 30 18 7 325
May 15 0800 151 47 37 27 16 23 301
1300 163 30 37 35 23 17 305
1800 114 30 31 31 20 20 246
May 16 0530 124 33 28 23 16 20 244
0800 152 48 32 20 17 16 285
1300 143 45 39 35 25 26 313
1530 158 59 36 33 18 24 328
1800 115 31 32 36 18 31 263
     Number of counts 11 11 11 11 11 11  
     Mean 149.2 42.5 37.5 29.7 20.1 18.4
     95% conf. int. ±14.6 ±6.8 ±4.6 ±3.5 ±2.6 ±4.7
     Stand. error 6.57 3.03 2.07 1.57 1.18 2.13
     Coef. var.% 14.6 23.7 18.3 17.5 19.5 38.3
May 15 and 16 only -- 0800, 1300, 1530 hours only
     Number of counts 5 5 5 5 5 5  
     Mean 153.4 45.8 36.2 30.0 19.8 21.2
     95% conf. int. ±7.3 ±11.5 ±2.9 ±7.2 ±4.4 ±4.9
     Stand. error 2.62 4.15 1.04 2.59 1.59 1.77
     Coef. var.% 3.8 20.3 6.4 19.3 17.9 18.8
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