TABLE F-20.--Waterfowl brood and late-nesting indexes by stratum compared to previous year and tung- 
term averages, North Dakota, South Dakota, and western Minnesota, 1963 
[ Index numbers in thousands ] 





Average Percent change 

é from-- 
Broods: 
Ducks brocd index----+----------- + 45 + 56 
Average brood size } ----------- : 
Coot brood index---+------------- + Pl] 
Late-nesting index: 2 
Dabblers: 
Mallard------------+----<--=--- -9 - 0.3 
Gadwal]1----------------------- is. + 48 
American widgeon-------------- 6 +119 
Green-winged teal------------- at +150 
Blue-winged teal-------------+ rai - 9 
Shoveler -----+-------2--0------ 5 =e 
Pintail------------+----------- 5 - ho 
Subtotal -------------------- 25 ee 
Divers: 
Redhead - ---------------------- = 39 + 55 
Canvasback-~------------------ i a 
Scaup-- ++ -----7- eee reer en nn ie ae 
Ring-necked duck-------------- as che, me 
Ruddy duck------+---<--------- + 95 + OT 
8.4 
8.0 
1.2 7 8. 
sinttadeneeeeenenennn ee x 
1 Class II and III broods only. 
2 As indicated by adult pairs and singles. 
148 
