168 


Estimated Total Nesting Pairs Total Fall Population 
Species 1951 1952 1953 1954 1951 1952 1953 1954 
Mallard 980 3,640 1,400 500 5,000 18,100 7,000 2,480 
Gadwall 340 480 200 100 2,000 2,500 1,000 500 
Cinn,. teal 100 580 100 100 550 2,900 460 480 
Others 20 180 140 90 100 900 700 450 
‘Total 1 , 440 4,880 1,640 790 7,650 24,400 9,160 3,910 
Coots 0 180 120 100 0 900 600 500 
e. Figures this year indicate a 57 percent decrease in both nesting 
ducks and in the fall population. Coots showed an 8 percent 
decrease in breeding pairs and a 17 percent decrease in the fall 
population. This small area was rechecked with complete cover- 
age and practically the same results were obtained. No explanation 
can be given for the decreased populations. 
3. North San Francisco Bay 
a. Area - 30 square miles 
b. Type - Tidal saltmarsh, gun clubs, river delta pasture land. 
c. Coverage - Aerial 15 percent, 1951, 1952, 1953, 1954. 
d. Production summary: 
Estimated Total Nesting Pairs Total Fall Population 
Species 1951 1952 1953 1954 1951 1952 1953 1954 
Mallard 560 480 440 400 Zz, 700 2,400 2,200 2,000 
Pintail 7 30 140 20 35 150 700 100 
Gadwall 73 130 90 140 350 650 470 700 
Cinn. teal 0 30 10 30 0 150 30 150 
Ruddy 0 60 90 120 0 300 270 600 
Shoveler 7 10 30 50 40 50 150 290 
Others 0 110 80 0 0 550 240 0 
Total 647 850 880 760 3,125 4,250 4,060 3,840 
Coots 0 0 250 420 0 0 1,250 2,100 
e. This area shows a slight decrease (5 percent) in the fall population 
of ducks, while the coot population showed an increase of 68 percent. 
