144 
3. North San Francisco Bay 
a. Area - 36 square miles in 1949, 30 square miles in 1950, 1951 and 
. 1952. . 
b. Type - Tidal salt marsh, gun clubs, river delta pasture land. 
c. Coverage - Aerial 12-1/2 percent in 1949, 10 percent in 1950, 
15 percent in 1951 and 1952. 
d. Production Summary: 


. Estimated Total Nesting Pairs Total Fall Population 
Species 1949 1950 1951 1952 1949. 1950 1951 1952 
Mallard 575 806 560 480 2,800 4,000 2,700 2,400 
Gadwall 7 40 56 73 130 200 300 350 650 
Pintail 5 9 7 30 25 50 35 150 
Shoveler 10 9 7 10 50 50 40 50 
Ruddy duck 0 74 0 60 0 350 0 300 
Others - ~ - 140 - mm - 700 
Total 630 954 647 850 3,075 4,750 3,125 4,250 
e. Remarks: Essentially the same as previous years. 
4, North San Joaquin Valley (Grasslands) 
a. Area - 150 square miles. 
b. Type - Gun clubs and intermittently flooded pasture lands. 
c. Coverage - Aerial 25 percent in 1948, 1949, 1950, 1951 and 1952, 
d. Production Summary: 
Estimated Total Nesting Pairs Total Fall Population 
1949 1950 1951 1952 1949 1950 1951 1952 
Mallard 1,216 1, 304 1,703 2,070 5,400 6,600 8,500 10, 350 
Gadwall 156 56. 192 280 675 300 1,000 1,400 
Pintail 16 24 100 30 75 150 500 150 
Shoveler 24 8 12 50 100 60 70 250 
Redhead 28 z20 88 20 130 100 450 100 
Tree duck 0 6 0 0 - 40 0 - 
Ruddy duck 12 32 28 0 50 180 160 - 
Cinn. teal — 192 76 173 340 950 500 900 1,700 
pr 
Total 1,644 1,526 2,295 2,790 7,380 7,930 11,580 13,950 
Coots 400 446 724 960 1,600 2,000 3,500 4,800 
e. Remarks: 20 percent increase. Nesting pairs in previous years 
amounted to about 2 percent of the State total. Increase is significant in this 
local area but not on a State-wide basis. 
