TABLE B-8. North Dakota--1977 waterfowl breeding ground survey results. bo 
W EED R SURVEY TERFOWL PRODUCTION SURVE 
(NUMBERS IN THOUSANDS) (NUMBERS IN THOUSANDS) _, 
1977. % CHANGE 1967-1976 % CHANGE 1977 % CHANGE 1967-1976 % CHANGE 
FROM 1976 AVERAGE FROM AVERAGE FROM 1976 AVERAGE FROM AVERAGE 
MAY PONDS 339.5 -47 582.6 -42 JULY PONDS 175.0 -52 360.3 -51 
DUCK BROOD INDEX 29.9 +6 41.6 -28 
AVG. BROOD SIZE 4.892 -14 5.751 -15 
BREEDING POPULATION ESTIMATES LATE-NESTING INDEXES 
DUCKS: 
DABBLERS: 
MALLARD 374.6 -18 586.4 - 36 5.0 -48 15.9 -68 
BLACK DUCK 0.0 n.c. 0.0 nee. 0.0 n.c. 0.0 n.c. 
GADWALL 168.5 +4 292.5 -42 2.3 -44 13.0 -82 
AMERICAN WIGEON 97.1 -57 138.5 -30 6 -33 1.0 -40 
GREEN-WINGED TEAL 18.9 -57 67.9 -72 we -50 9 -78 
BLUE-WINGED TEAL 282.1 -45 905.4 -69 2.0 +43 10.0 -80 
NORTHERN SHOVELER 84.6 -22 254.8 -67 0.0 -100 4 -100 
PINTAIL 91.1 -56 527.7 -83 2.1 -46 2.3 -9 
SUBTOTAL 1,116.9 -35 2,773.2 -60 12.2 - 43 43.5 -72 
DIVERS: 
REDHEAD 36.8 -75 149.5 -75 5 n.c. 1.3 -62 
CANVASBACK 13.9 -9 33.1 -58 od 0.0 
SCAUP 17.4 -72 43.4 ~60 0.0 n.c. 4 -100 
RING-NECKED 9.3 +22 5.4 +72 0.0 n.c. 0.0 n.c. 
AMERICAN GOLDENEYE 0.0 n.c. | -100 0.0 n.c. 0.0 n.c. 
BUFFLEHEAD 0.0 -100 5 -100 0.0 n.c. 0.0 n.c. 
SUBTOTAL 77.4 -67 232.0 -67 8 +60 1.7 -53 
MISCELLANEOUS: 
OLDSQUAW 0.0 a 0.0 n.c. 0.0 no.c. 0.0 n.c. 
EIDER 0.0 Me Crs 0.0 n.c. 0.0 n.c. 0.0 n.c. 
SCOTER 0.0 nc. 0.0 Nee. 0.0 n.c. 0.0 n.c. 
RUDDY DUCK 20.5 -10 134.2 -85 7 -88 5.8 -88 
MERGANSER 0.0 n.c. 4 -100 0.0 n.c. 0.0 n.c. 
SUBTOTAL 20.5 -10 134.6 -85 7 -88 5.8 -88 
TOTAL DUCKS 1,214.8 -38 3,139.8 -61 13.7 -51 51.0 -73 
cooTSs 
AMERICAN COOT 91.8 -37 323.0 -72 
GRAND TOTAL 1,306.6 -38 3,462.8 -62 13.7 ~5] 51.0 -73 

TABLE B-9. South Dakota--1977 waterfowl breeding ground survey results. 
WATERFOWL BREEDING PAIR SURVEY a WATERFOWL PRODUCTION SURVEY 
(NUMBERS _IN THOUSANDS) : (NUMBERS _IN THOUSANDS) 
1977 % CHANGE 1967-1976 % CHANGE 1977 % CHANGE 1967-1976 % CHANGE 
FROM 1976 AVERAGE FROM AVERAGE FROM 1976 AVERAGE FROM AVERAGE 
MAY PONDS 276.1 +10 368.0 ~25 JULY PONDS 162.6 -20 255.7 - 36 
DUCK BROOD INDEX 20.7 +90 30.4 -32 
AVG. BROOD SIZE 4.936 +4 5.065 -2 
BREEDING POPULATION ESTIMATES LATE-NESTING INDEXES 
DUCKS: 
DABBLERS: 
MALLARD 267.2 -19 424.8 -37 5.3 -4 14.2 -63 
BLACK DUCK 0.0 n.c. 0.0 n.c. 0.0 n.c. 0.0 n..c 
GADWALL 69.7 -18 159.8 -56 1.8 -40 ried j -77 
AMERICAN WIGEON 55.8 -68 95.0 -4) 2.2 +83 2.1 +5 
GREEN-WINGED TEAL 24.5 -53 51.4 -52 0.0 -100 6 -100 
BLUE-WINGED TEAL 318.8 -34 663.5 -52 3.0 +173 6.3 -52 
NORTHERN SHOVELER 77.5 +13 148.2 -48 4 7 -43 
PINTAIL 130.8 +17 259.6 -50 1.1 -62 2.6 -58 
SUBTOTAL 944.3 -28 1,802.3 -48 13.8 -] 34.2 -60 
DIVERS: 
REDHEAD 12.8 +42 44.4 -71 0.0 n.c. 5 -100 
CANVASBACK 3.8 +6 8.4 -55 0.0 -100 a -100 
SCAUP 13.8 -76 30.6 -55 ae 2 n.c. 
RING-NECKED +5 -72 1.4 -64 0.0 n.c. 0.0 n.c. 
AMERICAN GOLDENEYE 0.0 nc, oa | -100 0.0 n.c. 0.0 Nace 
BUFFLEHEAD 0.0 n.c. 23 -100 0.0 nc. 0.0 n.c. 
SUBTOTAL 30.9 -57 85.3 -64 2 -33 8 -75 
MISCELLANEOUS: 
OLDSQUAW 0.0 n.c. 0.0 n.c. 0.0 n.c. 0.0 n.c. 
EIDER 0.0 n.c. 0.0 n.c. 026" .nses 0.0 n.c. 
SCOTER 0.0 n.c. 0.0 n.c. 0.0 n.c. 1 -100 
RUDDY DUCK 5.6 -10 61.2 -91 2 2.2 -9] 
MERGANSER 0.0 n.c. 0.0 n.c. 0.0 n.c. 0.0 nce 
SUBTOTAL 5.6 -10 61.2 -9] 22 2.3 -9] 
TOTAL DUCKS 980.8 -29 1,948.8 -50 14.2 on.c 37.3 -62 
cooTS 
AMERICAN COOT 108.1 +20 126.7 -15 
GRAND TOTAL 1,088.9 -26 2,075.5 -48 14.2 ~3n.c. 37.23 -62 
LZ 
