TABLE C-3, --Distribution of wintering waterfowl, Pacific Flyway extended, 1956-61 
| Index numbers | 
















British Columbia-------------~--- 
Waahington---------------------- 1,291,347 
Oregon---~----------- 3-4 0505-6 1, 018, 989 | 1,034,976 
Galdfornis--—-—=25--se2454- 225-2 5,072,667 | 5,396,143 
7 ee eee 2 578,351 553,390 
Nevada---------+~+--+---+-----+--- 58,998 54,782 
Utah----------- sore erescnnercnne 39,895 68 , 307 
Arizonge------------~+2202-555--6 64,292 54,877 
Mexico: West coast-------------- 1,531,207 | 1,623,317 
Tetel-e=-c-eeees=— Soe eee 10,255,313 
Comparable coverage: 








1956-1957-------------~------- 7,427,176 is =k <3 
1957~1958-------~+------------ 7,435,176 9,330,371 =e te 
1958-1959---~-----------~----- 10,398,863 | 11,486,453 ~ a 
1959-1960----~---------------- 11,478,654 9,637,563 te 
1960-1961--------------------- ie 9,668,848 | 10,251,006 

1 Baja California only. 
TABLE C-4, --Trend in waterfowl numbers, Pacific Flyway extended, winter survey, 1949-61 
[ In thousands ] 

Note.--Coverage during the period was not comparable and the data were adjusted, using 1959 and 1955 as base years. 
It was assumed that areas where comparable surveys were conducted provided an accurate measure of the percentage 
change between 2 consecutive years. On this basis, population estimates were calculated backward and forward from the 
pase years. 
1 Index arbitrarily reduced from 1,797,000 to 1 million geese. During January 1951, more geese were estimated to be 
in Merced County, California, than were in the entire flyway either the previous or the following year. It seems cer- 
tain thet the estimate was in error. If the geese recorded in Merced County are deleted from the totals for 1950, 
1951, and 1952, and a revised estimate is calculated based on change observed in the remaining areas, the index for 
1951 is about 1 million birds. 
2No surveys were conducted in Mexico in 1957, The data indicate that it is unlikely that surveys in the United 
States, Canada, and Alaska accurately revealed the trend in wintering populations of ducks that year. 
63 
