Species 
Mallard 
Pintail 
Gadwall 
Cinn., Teal 
Redhead 
Ruddy Duck 
Shoveler 
F. T, Duck 
Others 
nn ee Ee 
13,950 6,870 8,830 4,250 
Total 
Coots 
Species 
Mallard 
Pintail 
Gadwall 
Ginn. Teal 
Redhead 
Ruddy Duck 
Shoveler 
F. T. Duck 
Others 
Total 
Cocts 
4. 
oe 

North San Joaquin Valley (Grasslands) 
a. Area - 150 square miles. 
b. Type - Gun clubs and flooded pasture lands. 
c. Coverage - 25 percent aerial transect. 
d. Production summary: 
Estimated Total Nesting Prs. 
1952 
2,070 
30 
280 
340 
20 
0 
50 
0 
0 
1953 1954 
1,420 2,170 
80 105 
180 310 
180 235 
60 25 
30 z0 
200 10 
0 2) 
0 0 
1955 
750 
40 
130 
190 
40 
50 
120 
0 
10 
2,790 2,150 2,880 1, 330 
960 
e. Remarks: 
3,900 250 
530 
Fall Population Indices 
1952 = =1953 
10,350 4,420 
150 330 
1, 400 570 
1, 700 620 
100 190 
0 100 
250 640 
0 0 
0 0 
4, 800 10, 770 
1954 1955 
6,950 2,440 
290 120 
870 410 
530 600 
80 130 
60 140 
30 380 
20 0 
0 30 
1,370 2,890 
ducks while the fall population was down 52 
percent. 
population doubled in numbers over 1954. 
San Joaquin Valley 
a. Area - 
land. 
Not determined. 
b. Type - Flooded lake bottoms, river channels and apricultural 
c. Coverage - Aerial - Variable (10 percent to complete 
coverage). 
d. Production summary: 
Fall 
Estimated Total Nesting Pairs Population Indices 
1952 1953 1954 1955 1954 1955 
1, 700 2,570 2,935 2,670 8,100 7,370 
40 190 80 40 220 110 
290 50 160 120 440 340 
190 200 | 220 290 610 800 
70 30 50 30 140 80 
0 140 5 130 z20 360 
10 30 30 90 80 250 
20 10 5 30 20 80 
0 0 0 0 0 0 
2,320 3,220 3,485 3,400 9,630 9,390 
2,600 4, 700 400 780 z,900 4,180 
A decrease of 54 percent was recorded for breed- 
Breeding coots and the resulting fall 
147 
