Vol. 23, No. 2 
Pag© 3 
Number of escape dens 
Number of nesting dens 
Percentage forested 
Percentage ravine 
Number of species less than 1‘ tall 
Table 2. Transformed Variables (DD = density of dominant, TO = total density, 
BA = basal area) 
1. High DD, TD and BA of basswood and sugar maple; large number of tree species; 
high percentage ravine. 
2. High DD, TD, and BA of black oak, white oak, and all trees combined; large 
number vines. 
3. High DD and TD for all trees combined; high DD, TD, and BA of shagbark and 
tight-bark hickories; large number of vines. 
4. High TD and BA of sassafras; high DD, TD, and BA of ash and tulip; high 
mean dbh of dominants. 
5 . High DD of shagbark hickory; high BA of honey locust; high DD, TD, and BA 
of elm; low percentage forested. 
6. High DD, TD, and BA of red oak and beech; large number of tree species and 
nesting dens; high percentage of ravine. 
7» High DD and BA of sassafras; high DD, TD, and BA of crabapple; high DD and 
TD of honeylocust; closer distance to edge; low percentage forested. 
8. High DD, TD, and BA of beech; fewer stems greater than l' tall; few stems 
greater than .5" and less than 5 41 dbh; fewer species less than P tall; 
few species greater than P and less than .5" dbh; few species greater than 
.5" and less than 3" dbh; high percentage ravine. 
9. High DD, TD, and BA of sycamore. 
10» High DD, TD, and BA of black walnut. 
Responses of Prairie Chickens to Habitat Manipulation - W- 66 -R R. L. Westemeier 
The density of prairie chicken nests (0.85 per 10 acres) on sanctuaries at 
Bogota rn 1979 exceeded nest densities of all other grassland birds except red¬ 
winged blackbirds ( 8.5 nests per 10 acres). Usually, on the sanctuaries, nest 
density for prairie chickens is less than nest density for eastern meadowlark 
and dickcissel. 
For 13 years ( 1966 - 78 ) the density of prairie chicken nests on the 
sanctuaries averaged 1.3 nests per 10 acres; hence the nest density of chickens 
in 1979 was 66 % of the mean. However, 8 other birds, the cottontail rabbit, and 
small mammals (Microtus and Synaptomys ) showed nest densities in 1979 that were 
