TABLE E-23. --Waterfowl breeding population survey data, South 
Dakota, 1950-61 
Population index 





Number per 
square mile 

Ducks: 
1961: 
310, 500 


316,600 
saat se iets 550, 100 
4.30 
TABLE E-24. --Duck breeding population indexes, by stratum, Nebraska, 1960 and 1961 
Total 
1 Sand hills South-central 
Species j 
Percent Percent Percent 
1960 1961 change 1960 1961 change 1960 1961 ol a 
Dabblers: 7 
Pintail------------------ -30 
Mallard------------------ +14 
American wldgeon--------- +71 
Shoveler-~-------+--------+-+ -5 
Gadwall------------------ -12 
Blue-winged teal--------- =30 
Green-winged teal-------- -70 
Subtotal---------------- 133,500 169,100 -20 
Divers: 
Scaup----------~--------- 4,700 +111 
Canvasback--------------- No change 600 No change 
Redhead-----------~------ +22 2,600 +30 
Ring-necked duck--------- “= =e = 
Bufflehead-------+.------ _ -- as — = 
Ruddy duck---~----------- 
1,800 +94, 
+94, -- -- 
Subtotal----~----------- 21,200 2,500 12,700 | 22,600 | +78 
it ma ae 
a, Species composition based on ground observations. 

96 
