
Se] 


Estimate Percent of 
Physiographic Minimum Population State-wide Population 
Division 1956 1957 1956. | 1957s Change 
Minnesota Valley 13,000 5,000 2% 1% - 1% 
Prairie Hiils 134,000 88, 000 24% 22% = 2% 
James River Valley 179,000 114,000 31% 29% - 2% 
Missouri Hills 67,000 62,000 12% 15% + 3% 
Missouri Plateau 178,000 130,000 31% 33% + 2% 
State-wide Total 571,000 399,000 100% 100% 


Table 3 - Species Composition of the 1957 Breeding Population in South 
Dakota and 1956 to 1957 Trends 
Number of. Males . Percent Composition 
Species 1956 1957 1956 1957 Change 
Blue-winged Teal 4677 2774 48.16 48.22 None 
Mallard 927 467 9.54 8.12 ~ 1% 
Pintail 617 515 6.34 8.95 + 3% 
Shoveler «(1245 521 12.82 9.06 - 4% 
Gadwall 599 363 6,16 6.31 None 
Lesser Scaup 654 548 6.73 9.53 + 3% 
Redhead 327 212 3,37 3,68 None 
Baldpate 333 227 3.43 3.94 None 
Canvasback Be 38 0.54 0.66 Nox: 
reen-winged Teal 106 75 1,09 1.30 © None 
Ringneck | 6 13 0.06 0.22 None 


hh 

58 
