167 
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 - 2 1/2 percent aerial 1951, 4 1/2 percent aerial in 1952, 
21/2 percent 1953 and 1954. 
d. Production summary: 

Estimated Total Nesting Pairs Total Fall Population 
Species 1951 1952 1953 1954 1951 1952 1953 1954 
Mallard 29,240 34,300 25,930 20,240 150,000 171,500 90,750 86,020 
Pintail 0 300 200 80 0 1,500 700 340 
Gadwall 200 600 600 280 1,000 3,000 2,100 1,190 
Cinn. teal 400 1, 700 1,160 520 2,400 8,500 4,060 2,210 
Redhead 0 60 70 40 0 300 240 170 
Ruddy 0 oO 0 40 0 0 0 170 
Shoveler 80 40 240 40 400 200 840 170 
Others 0 0 0 10 0 0 0 40 
Total 29,920 37,000 28,200 21,25 153,800 185,000 98,690 90, 310 
Coots 1,720 4,500 8,080 8,240 8, 000 22,500 28,280 41,200 
e. This area shows a decrease of 25 percent in nesting pairs of ducks 
and 8 percent decrease in the total fall population. The breeding 
population of coots remained about the same, but the fall population 
showed a 45 percent increase. Production of both ducks and coots 
was probably better this year because there was less spraying of 
dieldrin than in 1953. 
2. Suisun Marsh 
a. Area - 140 square miles. 
b. Type - Natural tidal marsh, gun clubs and agricultural land. 
c. Coverage - Aerial: 5 percent 1951, 1952, 1953, 1954. 
d. Production summary: 
