
145 
Results 
For the following areas comparable data have been gathered in all 
four years. A standard pattern of reporting has been used to include pertinent 
facts with reference to individual areas. Ona sampling basis, coverage of the 
entire State production can be considered as essentially complete; thus figures 
are shown as actual numerical estimates of total numbers rather than as ducks 
per square mile, etc. Data on individual areas studied are summarized with 
such remarks as are pertinent. "Total fall population" includes resident adults 
plus locally reared young, 
1. Sacramento Valley 
a. Area - 2400 square miles. 
b. Type - Agricultural land including 290,000 acres of rice, 
plus managed refuges and gun clubs. 
c. Coverage - 4-1/2 percent aerial in 1952, 2-1/2 percent 
in 1953 to 1955. 
d. Production summary: 
Estimated Total Nesting Prs. Fall Population Indices 
Species 1952 1953 1954 1955 1952 1953 1954 1955 
Mallard 34,300 25,930 20,240 22,320 171,500 90,750 86,020 93,210 
Pintail 300 200 80 200 1,500 700 340 730 
Gadwall 600 600 280 z280 3,000 2,100 1,190 1,400 
Cinn. Teal 1,700 1,160 520 920 8,500 4,060 2,210 3,020 
Redhead — 60 70 40 0 300 240 170 0 
Ruddy Duck 0 0 40 0 0 0 170 0 
Shoveler 40 240 40 0 200 840 170 0 
Others 0 0 10 0 0 0 40 0 
LE ee 
Total 37,000 28,200 21,250 23,720 185,000 98,690 90,310 93,360 
Coots 4,500 8, 080 8, 240 4,760 22,500 28,280 41,200 21,930 
e. Remarks - This area shows an increase of 12 percent in 
nesting pairs of ducks and a three percent 
increase in the fall population. The number 
of breeding coots decreased 43 percent, and 
the fall population showed a decrease of 44 
percent. 
2. Suisun Marsh 
a. Area - 140 square miles. 
b. Type - Natural tidal marsh, gun clubs and agricultural land. 
c. Coverage - Five percent aerial transect, 
d. Production summary: 
