38 
indices for the North San Joaquin Valley (Grasslands),* 1975-78. 
ee Se 
Species 
Dabblers 
Mallard 
Gadwall 
Cinnamon teal 
Shoveler 
Pintail 
Subtotal 
Divers 
Redhead 
Ruddy duck 
Subtotal 
Miscellaneous 
Total ducks 
Coot 
1975 
251. oo) 
1,040 
1,650 
190 
270 
5, 280 
160 
330 
490 
30 
5,800 
7,380 

1976 
1,470 
710 
820 
129 
120 
3,240 
80 
140 
220 
3,460 
2,890 
1977 
1,590 
840 
890 
180 
140 
3,640 
20 
40 
60 
3,700 
5,500 
a a $e ee oe et ee es eee we 
——— — 
Estimated total nesting pairs 
1978 
2,230 
900 
1,400 
190 
320 
5,040 
60 
290 
350 
10 
5,400 
1,540 
California -- Estimated total nesting pairs and fall population 
a 
Fall 
1975 
6,910 
3,250 
>, 180 
590 
840 
16,770 
500 
89U 
15330 
60 
18,220 
42,720 
opulation indices 
1976 
4, 580 
2,230 
2,550 
360 
350 
10,070 
240 
390 
630 
10,700 
15,730 
1977..~—s«1978 
5,170 7,240 
2,650 2,820 
2,790 4,390 
570 570 
430 1,000 
11,610 16,020 
60 180 
100 800 
160 980 
10 
VL, 770. 175010 
29,960 8,390 
-wie ee @ Se ee ew wae. 0 ee ee we ew 1 we ww me ew eer ee oe 
4Area--389 km?2; Type--Gun clubs and flooded pasture and rice lands; Coverage--25% 
aerial transects to complete coverage; Remarks--Breeding pairs of ducks increased 
46% and the fall population increased 45% while coots decreased 724. 
Some flooding 
of low lands along the San Joaquin River and its tributaries created good habitat 
for nesting ducks. 
Table B-18. 
for the South Joaquin Valley.? 
Species 
Dabblers 
Mallard 
Gadwal] 
Cinnamon teal 
Shoveler 
Pintail 
Subtotal 
Divers 
Canvasback 
Redhead 
Scaup 
Ruddy duck 
Subtotal 
Miscellaneous 
Total ducks 
Coot 
Estimated total nesting pairs 
1975 
1,910 
179 
47) 
90 
130 
1,870 
an 
49 
50 
1,969 
1,219 
1976 
839 
60 
180 
20 
90 
1,180 
1,189 
1,629 
1977 1973 
s90 1,13 
P39 189 
179 490) 
22” 
1591 "35989 
1,259 5,920 
19 
29 10 
10 
an 169 
69 199 
1 
1,319 ~Ss22" 
1,499 3,919 
39 
California -- Estimated total nesting pairs and fall population indices 
1975-78. 
Fall population indices 
1975 
2,800 
460 
1,299 
250 
340 
5,149 
119 
119 
120 
5.5 370 
6,599 
1976 
2,290 
159 
479 
4n 
25 
3,299 
3,29) 
8,769 
1977 
2,299 
36 
470 
414 
3,449 
40 
119 
150 
3,590 
8,190 
— 1978 
3,109 
490 
1,340 
590 
8,260 
13,780 
2 
20 
20 
329 
389 
2n 
14,189 
16,419 
aArea--approximately 596 km2; Tyne--rice land, pasture, and managed refuges; Coverage-- 
aerial and ground, variable (10% to complete coverage); Remarks--duck pairs and the 
The Tulare 
fall population increased over 390% while coots were ud 199% from 1977. 
Lake Basin was covered on the survey this year as runoff from the southern Sierra 
Nevada Mountains inundated about 39 sections of land which created ideal nesting 
habitat for ducks and coots. 
1969. 

The last time these water conditions occurred was during 

