100 
Table 5, -- Identified Duck Broods in Central Washington, 1948, 1949, and 1950 

South Central Washington N.Cent. Wash. Cent, Wash. 

1948 1949 1950 1950 1950 
Species No.% Total No.% Total No.%Total No.% Total No.% Total 
Ra EN I I a a SS 
Mallard 145 57.5 274 63.4 221 58.9 50 42.7 271 55,1 
Gadwall 2 .8 8 1.8 12 3.2 12 2.4 
Baldpate 1 4 2 5 3 8 1 9 4 8 
Pintail. 4 1.6 19 4.4 9 2.4 2 Let 11 2.2 
G-w. teal 7 2.8 12 2.8 11 2.9 2 1.7 13 2.6 
B-w. teal** 44* 5,2 60* 7.8 49* 6.2 5x 3.6 54* 5.7 
Cinn. teal ** 12.2 6,1 6.9 .6 5.9 
Shoveler Zé .8 12 2.8 4 1.1 4 8 
Wood duck hl 4.4 20 4.6 47 12.5 5 4.2 52 10.6 
Redhead oe 1. 7 17 4.0 10 2.7 15 12.8 25 5.1 
Ringneck l 2 l 2 
W. harlequin 4 9 2 oe ] 9 3 6 
B. golden-eye 20 17.1 20 4.1 
Ruddy duck l .4 3 .6 14 12.0 14 2.9 
Merganser 3 1.2 1 2 7 1.9 <9 8 1.6 
Identified Total 252 432 375 117 492 
Unidentified 27 40 28 7 35 
Coot 67 45 73 118 
Grand Total 279 539 448 197 645 
* Combined Blue-winged teal and Cinnamon teal broods. 
** Representative percentage computed from total observed identified males. 
Waterfowl samples in Central Washington totaled 645 broods and 4, 530 
resident waterfowl (ducks and coot) observed during the summer. No resident counts 
were made during August. An additional 2,597 Canada geese were counted during the 
waterfowl inventory, bringing the total resident waterfowl count for the region to 
7,127 birds, To gain a population index for individual species and for the region, 
samples, expressed in averages per mile, were applied to the total sampled habitat 
within each breeding unit. The Tieton Basin indicated an average of 10.5 pairs of 
ducks (mallard and wood duck) per square mile and was applied to 15 square miles. 
Average ducks per lake or pothole in the North Central section was multiplied by the 
total number of potential lakes in each unit. A 77 percent nesting success was assumed 
in all territorial counts and the average brood size (5. 82) was applied to potential 
broods, The minimum population of the Canada geese in Central Washington was 
gained by accepting the total pairs and residents of the spring survey on the Columbia 
River. North Central Washington's waterfowl population represented 18 percent of 
the Central Washington summer population, 10,577 waterfowl. South Central 
Washington had 82 percent, or, 48, 095 of the estimated total waterfowl. 
Central Washington waterfowl estimates by species (Table 6) indicates 45.7 
percent of the waterfowl of the region are mallards. Coot, Canada geese, wood duck, 
blue-winged teal, and cinnarnon teal follow in respective importance. Twenty species 
of waterfowl were known to reside in two divisions of Central Washington during the 
summer of 1950, numbering an estimated 58, 672 birds, 24,725 adults, and 33,947 
produced young. 
