Table I. - Physiographic Distribution of the Breeding Waterfowl Population and 1952-1953 Trends 
rr a pr 
Uncorrected Corrected * Estimated Percent of State-wide 
Physiographic Ducks/Sq. Mi. Ducks per Sq. Mi. Minimum Population Population 
Division T952_1953 | 1952 1953 Change 1952 1953. «19521952 Change 
Minnesota Valley 8.95 9.45 10.92 10.58 - 3 14,000 13,000 ] | l 0 
Prairie Hills 17.61 23,41 21.48 26,22 +22 174, 000 212,000 17 21 + 4 
James River Valley 19,41 19,81 23.68 22.19 - 6 445,000 416,000 45 41 - 4 
Missouri Hills 18.08 20,45 22.06 22.90 + 4 167,000 173,000 17 17 0 
Missouri Plateau 4,24 4,73 5,17 5,30 Soe 202,000 207,000. 20 20 0 
State-wide 10.96 12.19 13.37 13,65 + 2 1,002, 000 1,021,000 100 100 0 

* Corrected from ground transect data to compensate for unobserved females on nests, 
Corrected by 1.22 in 1952 and 1.12 in 1953, 
Table Il. - Species Composition, Species Densities, and 1952-1953 Trends in the South Dakota Breeding Waterfowl 

Z6T 
Population 
Number of Males * Percent Composition * Species Densities ** 
Species iil a Ducks per Square Mile 
1952 1953 1952 1953 Change 1952 1953 _ Change 
Blue-winged teal 3,894 4,093 43.62 48,71 + 5,09 5.83 6,64 + 14 
Pintail 2,222 1,279 24.90 15.23 - 9.67 Fo 2.07 . - 38 
Mallard 1,318 1,084 14,88 12,90 - 1.98 1.99 1,76 - 12 
Shoveler 635 798 7.11 9.50 + 2,39 0.95 1, 30 + 37 
Gadwall 272 258 3.05 3,07 + 0,02 0,41 0.42 + 2 
Redhead 219 254 2.45 3.02 + 0,57 0.33 0.41 + 24 
Ruddy 161 116 1,80 1, 38 - 0,42 0,24 0.19 - 21 
Scaup 87 447 0.97 5.32 + 4,35 0.13 0.73 +461 
Canvasback 62 33 0.69 0.39 - 0,30 0.09 0.05 - 44. 
Baldpate 43 40 0.48 0.48 0 0.06 0.06 0 
Green-winged teal 10 7 0.11 0.08 -~ 0,03 0.01 0.01 0 
Wood duck 3 8 0.03 0.10 + 0,07 Tr. 0.01 - 
Black duck - 1 - 0.01 - - Tr. 
Bufflehead - 1 - 0.01 - -. Tr. - 
Cinnamon teal l 0 0.01 - - Tr, - 5 
Total 8,927 8,419 100,00 100.00 13.37 13.65 
** Product of percent species composition and the average, minimum, 
* Data from ground transects. 
State-wide duck density. 
