Vo 1. 21, No. 8 
Page 2 
?7 A step w i S e multiple regression program was used to evaluate- the influence of 
27 weather parameters on production of hickory seed. Although the trends in Jeed 
production among species of hickories were similar for the Shears measured 
different weather factors accounted for most variability in each species. ' 
We found no correlation between minimum temperatures during the spring 
flowering period and subsequent seed production. For precipitation on v the 
amount of rainfall in September was positively correlated (P <0.05) 'wi tf/seed 
production the same fall. We are not sure whether this conation his biotooical 
meaning because we used only sound seed production, not total seed production 9 
predation n on U h'\° r ab ° rt , ed) ' Sa P tembe r rainfall may affect the degree of insect 
predation on hickory seed and, thus, vary the amount of seed produced. 
varialton^irh-^ 006 C °T° n 'f ather fact ° r that cou,d account for the annual 
larle latilbirt ° ry ' pr ° du ? tion in each species, partly because of the 
instfficilnt I rJT 9 treSS W ' thin 6aCh ^ Which made 6 V ears data 
addii-ion • r f any statistical conclusions about annual variation. In 
el’il l, US weather variables may influence hickory production 
and unmeasurable) V cha r nae 'T a ?,° ther faCt ° rS (internal and external, measurable 
unmeasurable) change. Finally, we may not be selecting the correct variables. 
Responses of Prairie Oickens to Habitat Manipulation R. L . Westemeier, 
D. R. Vance 
The search for nests on the Bogota Study Area in 1978 nrodurerl Hai-a +.u =t . 
::: ^ c e ri s ro o m f n “ h .V 
rhp cnr 1 * i .°^ Sanctuaries was the highest number ever found relative to 
34 6 peScent° P the t ' 0 r ’h le ' ,e f u° Cl< t ) i Althou 9 h hatch success amounted to only 
also hioh fnSkn hTu hat = hes 08) relative to the population level was 
level 75 So^ks) as ^ igyV^ ’ !" '9”, with essentially the same population 
sanctuaries of whl^ , Wei ? " eStS f ° Und on 371 acres ° f ‘ ha same 
fertile eggs per clutcMIl^) hed ChSd ' ' ? 78 ’ c ! utch size 02-5 eggs), 
average. 9 P ' M '3)i and hatched eggs per clutch ( 12 . 1 ) were all above 
found^ togoTthiHlSr T, ”***' ° f prairie "•»« 
proportion of hens in the ^go^ « ^ ^ "r. ,h TV n “" y high 
cn.cn c prn „Ji 0a y L hock. ine sex ratio appeared to be at least 
percent of ?he san^ the u breed > "9 population was concentrated on 23 
P rcent of the sanctuary acreage-where the search for nests was also concentrated. 
I?'* £***": ^T^r:“d«t f :^ re ti:: t i!°^ p tr t) 
s:£ —* 
previous 'years^opossum^were^considered^he^pMmary *"preda tors^i^nes ts! ~ 
