Vol. 25, No. 8 
Page 2 
Ecology and Management of Squirre As - W-66-R 
C. M. Nixon, 
L. P. Hansen 
We anticipated that removal of adult squirrels would cause increased survival 
of the remanng young and adults on our study sites. Recapture rates of adult 
miles and femalls were consistently higher on the MRP male removal plot) ,end 
- £ S“ 
reported from unmanipulated fox squirrel populations in other stud e . 
We observed low recapture rates of adults on the TRP, ^om ^ich adult mal es 
had been removed, and unusually low recapture rates on the FRP and TRP. These 
observations suggest that adult survival rates may have been depressed where 
females were reeved rather than enhanced where males were removed. Depresse 
221TX-; females, ''possibly' resulting'inTncreasecTmovement 5, of the 
study plot. 
Yearling male and female survival, although seemingly positively affected by 
female removal, was not consistently Influenced by any treatment. We observed 
differences among plots, but inconsistencies in replicate samples suggested the 
differences were related to some factor other than treatment. 
(J-SA) male survival did not differ among treatments whereas J SA V 
rates were lowest on the FRP and TRP and highest on the control. This suggests 
there was a positive effect of adult females on survival of young females, 
with adult females, however, this may again relate to character! st, cso 
young rather than to the absence or presence of the adult ° ^ 
young females captured on the FRP were immigrants The young 
on the control and MRP may have been individuals born on the area t aroU DS 
disperse. Differences in recovery rates might be e ^ pecte ^ be ^ W ® e " , 9 of P * 
These results suggest that recovery rates may have been affected by remova ° 
adults, but indirectly—by changing the characteristics of the group of an.ma 
on which survival was being measured. 
Responses of Prairie Chickens to Habitat Manipulation - W-66-R 
R.L. Westemeier, 
J.E. Buhnerkempe 
Last month we discussed nest establishment rates for b !*» 
prairie grass according to a combination of prescribed b “ rn '??.®" d . 
management. In this report we look at nest success for 3 gall.form birds in 
prairie grass. 
Due to limited sample sizes of hatched nests for prairie rhickenspheasants, 
and quail in prairie grass, we could not show significant P > °;°5 ) d "erences 
for nest success relative to burning or other management conducted prior to nest 
“highest density of hatched prairie chicken nests was associated with 
post-burn > V (5th or later nest season since fire) and high mowing. Highest 
