ATLANTIC FLYWAY 
Winter Trend Data - Atlantic Flyway 
Weather conditions during the period when the winter survey was con- 
ducted were not particularly favorable. Therefore, there is some possibility 
that part of the decrease in wintering population that was recorded was due to 
adverse survey conditions rather than less birds. On the basis of coverage of 
the same areas during 1957 and 1958 there was a 25 percent decrease in ducks, 
a 10 percent decrease in geese, a 22 percent increase in brant, a 31 percent 
decrease in swan, and a 37 percent decrease in coot.e Species composition and 
percent change by individual species are presented in the table which follows. 
In the graph which follows are presented trends in duck, goose, brant, swan, 
and coot populations for the Atlantic Flyway for the period 19h9 through 1958. 
The data have been adjusted for comparable coverage between years. 
In the graph it will be noted that there has been a general trend 
downward in the duck populations, which reached a peak in 1953. The present 
level of duck populations is well below the average for the past 10 years. 
Species Composition - Atlantic Flyway - 1957 and 1958 
(Comparable Coverage) 

Percent of Birds Identified Percent 
Species 195 395 Change 
Coot 1663 13.3 - 36.7 
Scaup 16.1 171 - 17-9 
Black Duck 11.6 8.8 - Adel 
Canada Goose 9.8 10.9 - 14.0 
Mallard Qef pry - oh 
Pintail 58 6.2 - 16.3 
Canvasback 4.8 2.6 - 57-3 
Am. Brant 4.3 6.8 ~ 22.4 
Baldpate 2.8 3.9 # 529 
Ringneck 2.6 2a - 28.5 
Redhead 24 3.9 ~ 2.0 
Scoter & Eider 24 4.0 / 31.8 
Goldeneye 2.4 1.3 - 56.4 
Ruddy 1.6 3.9 # 91.0 
Merganser 1a. 1.4 - 0.8 
Whistling. Swan Vel 1.0 - 30.8 
Green=winged Teal 1.0 1.8 # 35.9 
Snow Goose 9 1.6 # 3301 
Gadwell 8 lel / 8.6 
Shoveler of ot = 48.0 
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Continued -- 
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