
Table 7.--Brood production on the Waubay study area, 1950 to 1953 
[No production for wood duck, cinnamon teal, or ringneck] 
PRODUCTION PRODUCTIVITY FOUR-YEAR AVERAGE 
broods per broods per Broods Percent 



- 
Produc= of 
square mile; tivity| broods 
square mile 100 pairs)? 

B-W Teal 
GadwaLl 
Mallard 
Pintail 
Shoveller 
Redhead 
Ruddy 
Lesser Scaup 
Baldpate 
Canvasback 
G-W Teal 
Unidentified: 
1 These figures may be multiplied by six to give a rough indication of the number 
of young ducks involved. Thus, there has been a 4-year average production of 
about 140 young ducks per square mile. 
WOW FO F ONO 
rw 
NNNF 
e 
FF ro Pw Ww 
* Not calculated for species with a breeding-population density of less than 2 
pairs per square mile, nor for the ruddy duck because of the difficulty in 
accurately censusing the breeding population. 
Table 8.--Fall duck populations (ducks per square mile) on the Waubay study area, 
Sept. 15 - Oct. 1, 1950 to 1953 








1950-53 
1950 1951 1952 1953 average 
Num- | Per- Num- | Per- Num=- | Per- Num | Per- Num- } Per- 
ber cent ber cent ber cent ber cent ber : 





Species 




B-W Teal 26 18 15 ho 22 79 20 
Gadwall 13 7 13 7 4 ho 11 
Mallard a4 22 25 36 19 gO 23 
Pintail a4 18 18 36 19 79 20 
Shoveller 3 mn 2 11 6 
Baldpate 9 30 ey ho 26 
Other 1 1 3 6 3 

All species 
25 
