TABLE B—-7- MONTANA--1979 WATERFOWL BREEDING GROUND SURVEY RESULTS. 

WATERFOWL BREEDING PAIR SURVEY WATERFOWL PRODUCTION SURVEY 
(NUMBERS IN THOUSANDS) (NUMBERS IN THOUSANDS) 
1979 % CHANGE 1969-1978 % CHANGE 1979 % CHANGE 1968-19782! z CHANGE 
FROM 1978 AVERAGE FROM AVERAGE FROM 1978 AVERAGE FROM AVERAGE 
MAY PONDS 353.0 +67 256.3 +38 JULY PONDS 223.8 N.C. 187.9 +19 
DUCK BROOD INDEX 104.3 +44 48.5 +115 
AVG. BROOD SIZE 5.344 +3 5.223 +2 
BREEDING POPULATION ESTIMATES LATE-NESTING INDEXES 
DUCKS: 
DABBLERS: 
MALLARD 389.3 +38 385.7 +1 1.8 -51 7.9 -77 
BLACK DUCK 0.0 N.C. 0.0 N.C. 0.0 N-C. 0.0 N.C. 
GADWALL 125.5 -28 77.8 +61 1.2 -65 1.6 -25 
AMERICAN WIGEON 150.4 -4 169.9 -11 1.4 -30 3.7 -63 
GREEN-WINGED TEAL 114.3 +120 69.2 +65 0.0 N.C. 3 -100 
BLUE-WINGED TEAL 280.4 +199 141.7 +98 9 -36 1.3 -31 
NORTHERN SHOVELER 281.5 +57 86.9 +224 3 -6 -50 
PINTAIL 505.2 +45 235.5 +115 1.5 -6 2.2 -32 
SUBTOTAL 1,846.6 +43 1,166.7 +58 tok -41 17.6 -60 
DIVERS: 
REDHEAD 40.6 +110 7.3 +456 -1 -50 «1 N.C. 
CANVASBACK 12.5 +64 7.2 +74 0.0 N.C. 4 -100 
SCAUP 132.2 +83 50.3 +163 1.1 N.C. 1.1 N.C. 
RING-NECKED 0.0 -100 6 -100 0.0 N.C. «1 -100 
AMERICAN GOLDENEYE 1.2 1.4 -17 0.0 NeC. -1 -100 
BUFFLEHEAD 3.4 +183 8 +325 0.0 N.C. 0.0 N.C. 
SUBTOTAL 189.9 +88 67.6 +181 1.2 -8 1.8 -33 
MISCELLANEOUS: 
OLD SQUAW 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. 0.0 N.C. 0.0 N.C. 
SCOTER 0.9 N.C. 0.0 N.C. 0.0 N.C. 0.0 N.C. 
RUDDY DUCK 44.2 -12 19.5 +127 1 -83 “4 -75 
MERGANSER 2.6 +117 7 +271 0.0 N.C. fil -100 
SUBTOTAL 46.8 -9 20.2 +132 -1 -83 5 -80 
TOTAL DUCKS 2,083.3 +45 1,254.5 +66 8.4 -40 19.9 -58 
Coots 
AMERICAN COOT 367.2 +285 36.0 +920 
GRAND TOTAL 2,450.5 +59 1,290.5 +90 
D/No survey in 1971 

ee 
