Table 18 
SPECIES COMPOSITION OF WATERFOWL POPULATIONS IN THE UPPER POTOMAC SECTION 
a reed 
January 
Populations: Seasonal Population Changes in 1958-59 
Average (Percentages) 
Percentages, 
1955-58 Oct.2-10 Nov.3-12 Dec.1-12 Jan.7-13 Mar.3-16 

Whistling Swan + 2 6 
Canada Goose 1 13 11 
Mallard 17 2 3 1 20 + 
Black Duck Ly 6 28 \ 22 8 
Gadwall + 
Pintail + 1 + 
Green-winged Teal + 
Shoveler s 
American Widgeon + 
Redhead | 26 
Ring-necked Duck if + 
Canvasback 16 6 11 26 
Scaup 3 8 13 
Common Goldeneye 
and Bufflehead 20 1 10 26 2 
Oldsquaw BY 
Ruddy Duck 1 80 Sh 66 17 
Mergansers 5 2 
American Coot 9 \ 8 
Unidentified Ducks 13 12 
Total Percent 100 100 100 100 100 100 
Total Population 6,100 200 800 7,700 400 7,600 
Os a a ae re oe ee eee 
91 
