36 
Table B-15. California -- Estimated total nesting pairs and fall population indices 
in the Sacramento Valley,? 1975-78. 
_ —_ er -_—— em ew Se eee ee ee ee 
ee eee ae ne en ae ee ee ee oe ee ee eee ee aad ~_— = =- 
Estimated total nesting pairs Fall population indices 
Species 1975 1976 1977 1978 1975 1976 1977 1978 
Dabblers ; 
Mallard 39,320 26,520 38,000 30,360 164,220 110,760 158,700 126,800 
Gadwall 800 440 840 720 4,000 2,200 4,200 3,600 
Cinnamon teal 4,240 2,200 3,960 2,080 15,830 8,220 14,780 7,770 
Shove ler 120 80 80 540 360 360 
Pintail 720 480 1,080 880 2,780 1,350 4,160 3,390 
Subtotal 45,200 29,640 43,960 34,120 187,370 123,030 182,200 141,920 
Divers i 
Canvas back 600 160 40 2,680 720 180 
Redhead 160 240 720 1,080 
Scaup 40 180 
Ruddy duck 1,000 240 200 4,470 1,15U 900 
Subtotal 1,800 400 40 440 8,050 1,870 180 1,980 
Miscellaneous 40 40 280 120 180 1380 1,250 540 
Total ducks 47,040 30,080 44,280 34,680 195,600 125,080 183,630 144,440 
Coot 37,440 22,440 34,680 6,120 172,510 103,400 159,800 28,300 
So a eS a ee ee SS 
me a a a ee ee a as SS SS SS SS SS SS SS SS SS -— —— 
4Area--6,216 km?; Type--agricultural land including 160,000 ha of rice plus managed 
refuges and gun clubs; Coveraye--2 1/2% of aerial transect; Remarks--The number of 
breeding pairs of ducks and the fall population showed a decrease of 22% while 
coots showed a 82% decrease. 

37 
Table B-16. California -- Estimated total nesting pairs and fall populations 
indices for the Suisan Marsh,®? 1975-78. 
ee oe, ee ee ee 
3 ee ee ee ee . 7 -_ 
~— ae ee_rlee eo 8 e-em we @ ow ee,» ewe = os oe 
Estimated total nesting pairs Fall population indices 


Species 1975 1976 1977 1978 1975 1976 1977 1978 
Dabblers 
Mallard 3,220 1,370 1,380 2,240 13,380 5,700 5,750 7,830 
Gadwall 620 160 330 560 3,460 800 1,670 2,800 
Cinnamon teal 630 240 330 460 2,330 900 1,250 1,690 
Shoveler 140 60 10 30 600 260 6) 130 
Pintail 160 60 30 110 620 220 100 410 
Subtotal 4,770 1,890 2,080 3,400 20,390 7,880 8,830 12,860 
Divers 
Redhead 
Ruddy duck 60 20 60 60 
Subtotal 60 20 60 60 
Miscellaneous 30 120 
Total ducks 4,860 1,890 2,080 3,420 20,570 7,880 8,830 12,920 
Coot 2,860 560 1,600 260 13,180 2,580 7,350 1,170 
—e. = - — eee we oe - ee 
rr rr = 
4Area--363 km? ; Type--Natural tidal marsh, gun clubs, managed refuges and 
agricultural land; Coverage--7.5% aerial transect; Remarks--The number of breeding 
pairs of ducks (1978) increased by 64% from 1977 while fall population increased 
46% from 1977. Coots decreased 84% over 1977. 

