Vol. 2*», Mo. h 
Page k 
Such changes in the waterfowl habitat in Illinois raise a variety of 
unanswered questions. Have waterfowl populations shifted in Illinois to adjust 
to changing conditions? Has the state experienced any overall decline in 
waterfowl numbers? Have some elements of the mallard population moved to the 
Central Flyway? 
By analyzing our spring, fall, and winter census records, we intend to 
determine whether duck populations in Illinois have shifted from such traditional 
areas as the Illinois and Mississippi river valleys to power plant cooling lakes 
or other newly created habitats. We will also compare the status of waterfowl 
in Illinois with that of the same species elsewhere on the continent and 
determine whether elements from the waterfowl population of the Mississippi 
Flyway have shifted to the eastern corridor of the Central Flyway. 
As we analyze census data on ducks, we also intend to evaluate trends in 
winter Canada goose populations since the establishment of refuges in the 
southern part of the state. 
To complete our evaluation of waterfowl populations in Illinois, we will 
examine the breeding numbers and their distribution for the fol owing species: 
wood duck, blue-winged teal, mallard, and giant Canada goose. Illinois is an 
important breeding area for wood ducks and a minor breeding area for mal ards, 
blue-winged teals, and rarely for other species of ducks. A Urge; feeding 
colony of giant Canada geese is becoming established in Fulton County and 
some other areas of Illinois. 
The examination of 
essential in developing 
population data for waterfowl in Illinois will 
future waterfowl management strategies. 
be 
