155 
Dakota. Actually a small increase occurred over 1949. New transects laid out in 
1950 include a representation of the flat country for future use. 
Breaking down the data for South Dakota we find: 
ea 
Waubay Hills: - 64% increase in water areas; 24% 
decrease in breeding pairs. 
Leola Hills: - 100% increase in water areas; 43% i aie 
ncrease in breeding pairs. 
Species Composition 
a eS 
Table 2, -- Species Composition of Breeding Pairs 
a a a 
NORTH DAKOTA SOUTH DAKOTA 
Blue-winged teal 29.0 24.7 31.4 42,0 42.7 42,8 
Pintail 27.1 29.6 28.8 13,9 1.7 14.7 
Mallard 12.9 18.1 14,1 15.0 16.2 16.0 
Gadwall 8.4 6.2 6.1 13.6 15.8 11.7 
Shoveler 11.0 9.0 8.9 5.8 4.1 4 
Redhead 3.5 3.7 2.8 3,3 2.6 2.6 
Ruddy duck 2.5 2.5 2.6 3.7 3.3 a1 
Canvasback 1,6 1.9 2.7 0.6 0.7 0.5 
Baldpate 2.4 2.5 1.7 1.6 1.4 0.9 
Lesser scaup bk. 2 1.3 0.7 0.2 1.0 0.4 
All others 0.4 0.5 0.2 0.3 1.4 0.2 

* Species composition based on new, 1950, transects. 
The significant changes in species composition were: 
1.- Increase in blue-winged teal in North Dakota and a drop in mallards. 
2. Increase in pintail and shoveler in South Dakota and a drop in gadwall. 
Increases in teal, pintail, and shoveler may have been due to delayed spring 
migration causing more of these ducks to stay in the United States to nest. 
The following tabulation gives an interesting breakdown of actual changes in 
species population. It includes data from ground transects run by Fish and Wildlife 
Service personnel plus data from P-R transects in North Dakota, 
Table 3. -- Species Composition in North Dakota based on Total Pairs Observed 
along Ground Transects 
Total Pairs Change from 1949 
Species 1949 1950 In Percent 
Blue-winged teal 1119 1672 f- 49 
Pintails 1453 1603 ~ 10 
Mallard ina: 724 - 781 -- 8 
Shoveler 487 569 f- 17 
Gadwall 240 260 -- 8 
Redhead 142 128 = ID 
Ruddy duck 85 125 x 47 
Baldpate 98 116 7 18 
Canvasback: — = 65 92 ~ 41 
Lesser scaup 82 49 — 40 
All species excepting redhead and scaup showed an actual increase over 1949, 
but due to its numerical superiority the species which made up over 60 percent of the 
