Table II - Comparative Numbers of Water Areas as Determined from Aerial Transects 

Approx, 
Area Water Areas Percentage Percent 
Area (Sq. Mi.) Per Sq. Mi. Potholes Reservoirs Total Water Areas Change 
1951 1952 1951 1952 1951 1952 1951 1952 
East Highline 7,920 1.4 1.1 75.9 73.7 24.1 26.3 11,088 8,712 - 21.4 
Center Highline 9,468 2.0 2.4 62.6 68.0 37.4 32.0 18,936 22,723 + 20.3 
West Highline (Great 7,020 2.3 2.5 72.4 68.0 27.6 32.0 16,146 17,550 + 9,3 
Falls Piedmont) 
Total 46,170 48,985 
Table III - Waterfowl Species Composition of Breeding Ducks for Five Trend Areas in Montana - 1951 and 1952 

Percent of species composition 
rown's ake eaicine axe owdaoin atneéea a ey 
Species Trend Area Wildlife Refuge Wildlife Refuge Ereezoutakes Trend Area 
1951 1952 1951 1952 1951 1952 1951 1952 1951-1952 
Mallard 19.5 39.8 14.3 16.8 26.4 17.8 4.5 3.6 19.1 16.0 
Pintail 4.6 4,4 10.1 15.9 11.2 28.7 32.4 28.8 0.3 0.0 
Baldpate 29.7. «13.8 4.7 3.6 6.8 5.7 1.1 1.5 0.7 2.3 
Shoveler 2.3 2.7 11.0 6.4 13.4 6.4 3.4 1.8 4.2 3.1 
Gadwall 4.6 Tae 20.6 21.2 9.0 6.4 28.7 32.4 3.5 1.5 
Scaup 14.1 6.6 1.7 6.1 1.1 1.9 11.0 21.6 3.8 1.6 
Coot 0.0 0.0 9.0 4.1 4.7 4.5 0.0 0.0 24.4 24.4 
Ruddy 1.2 0.0 4.4 3.7 2.0 5.1 4.7 0.8 3.8 1.0 
Canvasback 0.0 0.0 5.6 3.2 2.2 2.5 1.4 1.0 0.0 0.0 
Blue-winged teal 5.2 11.6 15.2 13.0 20.4 15.9 7.6 4.9 8.3 6.1 
Redhead 3.5 5.2 3.2 5.0 2.2 5.1 4.7 3.1 29.5 43.2 
G-w. teal 0.0 3.8 0.2 0.7 0.6 0.0 0.0 0.5 0.3 0.8 
Goldeneye 5.2 4.9 0.0 0.3 0.0 0.0 0.0 0.0 0.0 0.0 
Cinn. teal 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.7 0.0 
Bufflehead 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 
Total 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 
* Based on numbers of broods counted for each species. 
** Based on census of breeding ducks. 
*** Based on estimated breakdown of total breeding population. 
LOI 
