Vo 1. 5, No. 7 
Page 3 
of bobwhites and prairie chickens to respond to manipulation of agricultural habi¬ 
tat and to study the population responses of these species with respect to land- 
use practices. Initially, field work will be concerned with locating the remaining 
flocks of prairie chickens within the south-central counties of Jasper, Wayne, 
Marion, Effingham, Fayette, Richland, Clay, Clark, and others. These counties con¬ 
tain the majority of the remaining prairie chickens within the state. 
In order to study the population responses of these species to a management 
program, tracts of grassland or other potential nesting cover will be leased in a 
strategically located area, containing both bobwhites and prairie chickens, for 
the purpose of providing undisturbed nesting cover. A control or check area will 
also be selected for comparative study. 
6. Wi1dlife-Insecticide Relationships R. W. Lutz 
Roadside cock-crowing counts were conducted along a nine-stop route on the 
Donovan and Beaverville areas from March-July, 1960-62, and on the Iroquois area 
from March-July, 1961-62. 
The Donovan and Iroquois areas were treated with 2 pounds of aldrin per acre 
in the spring of 1960 and 19&1, respectively. The Beaverville area was not treated 
in I960, 1961, or 1962. 
The average number of two-syllable cock-calls heard per two-minute period dur¬ 
ing the months of greatest crowing activity (April-June) were used as an index to 
the abundance of territorial cocks on the study areas (Table 2). 
Table 2. —Pheasant crowing count indices on the Donovan, Beaverville, and 
Iroquois areas during 1962, with comparative data from i 960 and I 96 I. 
Area 
I960 
1961 
1962 
Index 
Index 
Index 
Change 
Percent 
Change 
Index 
1 ndex 
Change 
Percent 
Change 
Donovan 
6.4* 
6 . 9 * 
+0.5 
+ 7.8 
10.3 
+3.4 
+49.4 
Beavervi1le 
3.1 
6.0 
+2.9 
+93.5 
8.2 
+2.2 
+36.7 
1 roquois 
No data 
8.0* 
6-9+ 
-1.1 
- 13.8 
*Year of 
treatment 
fYear after treatment 
In I960, 
the Donovan 
index 
was 106.4 
percent greater 
than the 
Beavervilie in- 
dex. In 1961, 
however, although 
more than 
500 cocks were 
released 
on the 
Donovan 
area after the i 960 hunting season, the Donovan index had increased only 7*8 per¬ 
cent over the i 960 index. In comparison, the I 36 I index on the untreated Beaver¬ 
ville area was 93*5 percent greater than in i 960 . Further, the 1 96 1 Donovan index 
was only 13 percent greater than the l 96 1 Beaverville index, a decrease of 93*4 
percent from i 960 . 
These data suggest that in I 96 I, the relative abundance of territorial cocks 
