made to correct for late nesters by subtracting all pairs or lone drakes on 
territory during the last check, but this would not make allowance for incuba- 
ting hens where the drakes had deserted. 
Success on individual check areas ranged from 0.6 to 11.0 pairs per 
brood; the firet figure is due to an influx of broods to the check area from 
other areas. An analysis of the 11 most productive areas showed that all were 
surrounded for the most part by pasture or hayland. Seven of the areas were 
entirely open water, while fotr contained heavy stands of hardstemmed bulrush 
and cattail. 
Table 6. -- Production Data from Sample Areas 

Estimated Actual Pairs Species Composition 
North Dakota Breeding No. of per 
Pairs Broods Brood Pairs Broods 
Mallard 61 19 Z.e1 13.9 10.3 
Gadwall 51 19 2.70 11.6 10.3 
Bal dpate 20 6 3.83 5.2 3.e 
Fintail 5g 27 2.15 13.2 14.6 
Green-winged teal 5 0 - 1.2 0.0 
Blue-winged teal 135 70 1.93 30.8 37.8 
Shoveler 38 10 3, 80 8.6 5.4 
Redhead 16 33 2.00 3.6 4.3 
Canvasback 13 12 1.08 3.0 6.5 
Lesser scaup el 4 5.25 4.8 eal 
Ruddy duck _18 _10 1,80 4.1 5.4 
All species 437 1&5 2.36 
South Dakota 
Mallard 61 13 4,70 13.5 9.0 
Gadwall 58 13 4.46 12.8 9.0 
Baldpate 10 R 5,00 Zoe 1.4 
Pintail 72 13 5.54 15.8 9,0 
Green-winged teal 1 0 - 0.2 0.0 
Blue-winged teal 210 91 2. a0 46.5 63.2 : 
Shoveler 29 11 £2638 6.4 7.6 
Redhead 4 0 - 0.9 0.0 
Lesser scaup 6 0 - 1.3 0.0 
Ruddy duck P) 2h 1.00 0.2 0.7 
All species 452 144 3.14 
South Dakota 
Thirty sample areas were checked in South Dakota during the periods of: 
May 10 to 14; May 31 to June 9; and July 11 to 16. In South Dakota by far the: 
most successful breeder is the blue-winged teal. This fact is also borne out 
by the PN gai of blue-wing broods found on other broods counts (see 
Table 7). 
150 
