

a/Scaup are not regular resident breeding birds but are tallied as a part of the North American population. 
5/ Procedural changes in manipulation of data initiated in 1975 have been used for revision of raw data in these 
years. 
TABLE B-13. 
Year Mallard 
(adjusted) 
1968 110,000 
1969 101,000 
1970 111,000 
1971 96,000 
1972 69,000 
1973b/ 104,000 
1974b/ 98, 000 
1975 146,000 
1976 152, 000 
1977 218,000 
Gadwal1 
1,829 
218 
1,799 
1,319 
1,031 
3,149 
2,116 
25ee9 
970 
955 
Wigeon 
2,777 
3,273 
780 
5,605 
430 
4,923 
2,571 
3,522 
2,901 
8, 009 
Pintail 
801 
5,957 
1,297 
1,736 
1,489 
3,863 
2,285 
4,428 
1,677 
1,007 
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Green-winged teal 
223 
277 
58 
816 
587 
178 
351 
950 
127 
175 
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160,000 
162,000 
153,000 
153,000 
100,000 
136,000 
112,000 
163,000 
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219,000 
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5265 
3,738 
6,652 
2,267 
4,474 
1,757 
3,881 
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Scaup— 
23,098 
11,625 
15,268 
5,918 
13,204 
28,136 
63,689 
10,259 
24,280 
3,161 

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