CENTRAL FLYWAY 
South Dakota Waterfowl Breeding Population Survey - May 1958 


Sample Population 674 4753 1,011 
Sample Size (sq. mi. 2.7 526.5 arh.25 
Strata Area (sq. mi.) 21,481 25,591 26,598 
Expansion Factor 190 18.6 124.1 
Population Index 128,050 231,000 125,450 4Bl 500 
Ducks/sq.- me 59 9.0 7 6.6 

Species Comp, Number % Number % Number % Number % 
Pintail 32,000 25 55,450 2h 40,150 32 127,600 26 
Mallard. 60,150 47 106,250 46 70,250 56 236,650 49 
Shoveler 7,700 6 23,100 10 5,000 & 35,800 7 
Gadwall - - 2,300 1 “ ~ 2,300 1 
BeW Teal 26,900 21 34,650 15 8,800 7 70,350 14 
Scaup - - 2,300 1 1,250 1 £3,550 1 
Redhead 1, 300 1 2,300 1 ~ - 3,400 1 
Ruddy ~ 4,650 2 - - 4,650 1 
128,050 100 231,00 100 125,450 100 LOL, 500 100 
Percent Lone Drakes 
Pintail 84.3 26.0 17.6 379 
Mallard 59 2 74.0 58.0 65.5 
B-W Teal 42.0 LO.7 18.0 38.1 
For Survey Area 53-0 
Coot Index 0 1,263 2h8 1,511 
Pond Index 69, 540 139,190 60,809 269 , 539 
Ponds/sq. mie 362 5 ot 2e3 3.65 
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