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