42 
2, Breeding populations varied from 42.7 pairs to the square mile on Area I 
(open prairie), 100.2 on Area II (mixed prairie), 98.8 on Area III (open parkland) 
to 78.6 in Area IV (heavy parkland). Density of water areas varied also from 12.71 
ponds per square mile on the open prairie to the heaviest density of 54.06 on Area III 
where the most dense population was also recorded, 
3. Species composition of the areas differs as their vepetative types differ. 
In order of importance, the four most important species in each study area are listed 
as follows: Areal; pintail, mallard, shoveler, and widgeon; Area II; pintail, mallard, 
blue-winged teal and scaup; Area III; mallard, blue-winged teal, scaup and widgeon; 
Area IV; mallard, pintail, widgeon and blue-winged teal. 
4. Nesting data indicates a success of 47.4 percent on Area III, and 33.7 
percent on AreaIV. Avian and mammalian predators accounted for 53 percent on 
Area III and 66 percent on ArealV. 
= 
5. Brood success was generally low on all areas, 15 percent on Area II, 
35 percent on Area III, and 20 percent on ArealV, 
6. Aerial observations of study areas in four vegetative types indicate that 
91 percent of the breeding population was seen by the aerial observer on the bald, 
open prairie, 42.5 percent of the breeding population and 60 percent of the broods on 
the mixed prairie, 30 percent of the breeding pairs and 40 percent of the broods on > 
the open parklands, and 22 percent of the pairs and 27.6 percent of the broods in the 
heavy parklands. 
