Table 2. Pate of increase equation. 
Vol. 25, No. 1 
Page 3 
X = SSA + SYR + SAD + IM + 
Q-o .5 
' TOTAL 
(prod ad ) 
*0-0.5 
(PR0D yr ) 
TOTAL 
where 
X = rate of change 
SSA ■ survival of subadults 
SYR =* survival of yearling 
SAD = survival of adults 
S => survival from birth to 0.5 years 
0-0.5 
PR0D Ar ■ adult natality 
PR00 vd * yearling natality 
Total = total fox squirrels 
Pxesponses , of_ Prairie 
Chickens to Habitat Han i pul at ion - W-66-R 
PwL. v, estemeier, 
J.E. Buhnerkempe 
Since 1065 53 prairie chicken nests were found on the sanctuaries at 
Since 53 prair acres). The sanctuaries were 
Bogota in a cumulative tota f *-y switchgrass, tndiangrass, and big bluestem). 
dominated by prairie r ( V . .',- 3 ) 9 t hat use of prairie grass was low for 
* pheasants compared with use of redtop, timothy, or 
bcome; type of grass management was not considered. 
Prairie grasses are managed between nest seasons by one or a combination of 
several methods. In winter they may be prescr.be-burned in m,d ^ 
be hayed, and in late summer they may be mowed for weed contro ♦ 
nesting, combined for seed, or left undistur . 
flowing to control weeds or enhance nesting and “* ln '"9 
in a tall (35-45 cm) stubble and a similar litter cepth. Data for mowing a 
combining were grouped and resulted in 1.5 established prairie chicken| nests per 
1 , ha (10'acres) and 0.8 hatched nest per a ha. llest f" 1 ° c ^ s "“gh as for 
Ito and burned (no nests) categories. 
Since 1969 21 pheasant nests have been found in a cumulative total of 685 
5K :L p n«i: 
mowed (0.1|/1| ha), and hayed (0.3/8 ha) prairie grass. ~P found, 
in prairie sods burned the previous winter, and no prairie cmcken nests were 
