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Assessing Breeding Populations of Ducks by Ground Counts

Table 9


Table 9. Comparison of 1958 Kindersley census results utilizing various population comonents and sex ratio correction factors.
  Mallard Pintail Widgeon Shoveler Gadwall Blue-winged teal
Census date in May 10 10 21 21 31 31
A.
Indicated breeding population from counts including pairs and lone drakes only.
90 81 55 40 24 30
Per cent of estimate D using two components, pairs and lone drakes. (52) (54) (134) (138) (96) (111)
B.
Indicated breeding population from counts including pairs, lone males, grouped males, GFAC, and ARF.
191 161 55 40 24 34
C.
Mean indicated breeding population from five census dates (Table 12)
95% confidence interval

194
±12.9

168
±13.5

44
±12.4

34
±4.6

28
±7.0

32
±10.2
Mean sex ratio corrected population from C and Table 3 173 149 41 29 25 27

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