10 

Breeding Population Trends 
pm 7 PIR A IE ED 
The areas for which there are comparative data are listed below. 
Lake Claire Marshes (Alberta) 
Ducks per square mile: 1948 - 50,7 
1949 - 254, 6 
~1950 - 69.6 
(Decrease from 1949 of 72. 7%) 
Percent Composition 1950 
Mallard 47.5 Redhead: 1,7 
Pintail 17,1 Blue-winged teal 1.4 
Unidentified ducks 10,1 Canvasback 1,4 
Scaup 8.0 Bufflehead 0.8 
Baldpate 5,1 Green-winged teal 0.6 
3.7 
Shoveler 
(Remainder consisting of scoters, golden-eye, mergansers, ring-necked 
duck and ruddy duck). 
Athabaska Delta (Alberta) 
Ducks per square mile: 1948 - 25.5 
1949 - 53.9 
1950 - 61.4 
(Increase over 1949 of 13. 9%) 
Percent Composition 1950 
Mallard 42.9 Shoveler 3.1 
Pintail 27.5 Scaup 2.5 
Unidentified ducks 10.9 Blue-winged teal 1.3 
Canvasback 5.0 Redhead 1.2 
Baidpate 4.5 
(Remainder consisting of golden-eye, bufflehead, and green-winged teal), 
Slave River Parklands (N. W. T.) 
Ducks per square mile: 1948 - 4.3 
1949 - 6.8 
1950 - 5.7 
(Decrease from 1949 of 16, 2%) 
Percent Composition 1950 
Mallard 33.8 Unidentified ducks 6.3 
Baldpate 19.7 Shoveler 4.9 
Scaup 13.4 Bufflehead z.1 
Pintail — 12,0 Ring-necked duck 1.4 
Green-winged teal 6.3 
