TABLE F-21.--Long-term trend in July waterfowl brood and late-nesting indexes by species, 
North Dakota, South Dakota, and western Minnesota, 1963 
[ Index numbers in thousands |] 




Broods: 
Duck brood index-~-------------------+ 108.1 
Average brood size 1----------------- 5.2 
_ Coot brood indexX-----+--------------- - h, & 
Late=nesting index: 
Dabblers: 
Mallard -~-----+-+---9 er nner nnn nnn 30.8 
Gadwall-------+--- 22-220 n-ne -- 121 
American widgeon-------<----------+- 1.3 
Green-winged teal------------------ k 
Blue-winged teal-----------<------- 17.4 
Shove ler-----<- 2-20 es an enn eee nena -- 
Pintai l------+--+---=---- sere nce enna 3.3 
Subt otal ------4-- 2-2 wenn enn 63.3 
Divers: 
Redhead «~------------- 2 eee nen ene h.7 
Canvasback~----+-- w--2 een ene eee = 
SGCaUP 9 - -e ene tee er ee cere ren nm nnn -- 
Ring-necked duck------------<------- -- 
Ruddy duck--~-----------+-----=+---< 16.5 
Subtotal ----+---------------------- 21.2 
Total ----------2-se nner cre ncn renn- BLS 
1 Glass II and III broods only. 
2 As iM@scated by adult pairs and singles. 
TABLE F-22,--Waterfowl production and water indexes; North Dakota, 

1963 
Number of Number of 
Transects square miles water areas 
Test Run--------=---+-------- 7-5 
Antelope Lakes--------------- 8.3 
Drake -Anamoose --------------- 8.8 
Hurdsfield-Chaseley ---------- 8.0 
Cleveland-Woodworth --------- 7-0 
Medina-Gackle------+--------- 7-0 
Douglas --- ------------------- 8.2 
Snake Creek----=---2--"------ 7-0 
leeds Circuit---------------- TS 
Leeds ~Maza--~--+--~------------ 7.8 
Rugby , north------------------ TD 
Rugby, south----------------- 7.5 
Total sq----92--wennnn HH =- 2.1 
Brood index=<<--se8«-uesnn--2 
Water index------ se ccee sec ree 

149 
