Vol. 21, No. 7 
Page 3 
Wi 1 1 
34 
9 
Ogle 
28 
10 
McHenry 
32 
11 
Livingston 
2 
12 
Boone 
27 
13 
Logan 
3 
14 
Ford 
1 
15 
2-5 
1.87 
3.0 
1-77 
2-5 
1.58 
25.2 
1.50 
3.1 
1.39 
20. 7 
1.36 
30.2 
1.28 
- 7 
- 25 
+ 50 
- 41 
- 26 
- 37 
- 24 
- 94 
+ 35 
- 55 
- 33 
- 93 
+ 3 
- 96 
The 1973 findings were published by Ronald F. Labisky in INHS Biological 
Notes No. 94, 1975. 
Ecology and Management of Squirrels 
C. 
L. 
M. Nixon, 
P. Hansen 
age o^Trte '^ affSCt trae Seed Potion, including climate, 
ge of tree, and inheritance (some trees never bear much seed). 
For 6 years we sampled seed production levels for forest-qrown shaabark 
mockernut, and pignut hickories. We found that seed production was variable’ 
ong years, species, and individual trees (MWRL 21(6):2). 
growth) ^bh'flr ^ effec ^ s °f growth rate (using most recent 10-year radial 
growth), dbh (d 1 ameter at breast height), crown surface area, and age on seed 
dependent "variable ^T' edtree5 - We “«<! simple linear correlation, the 
over^he 6-yeii p^iod? 9 ° f $OU " d 56ed P rod ^ b ^ eaab tr~ 
sianifir fl f nH d that ?"' y J T variables ’ dbh and crown surface area, were 
i .?P iied a y rhe r i with seed production. We were somewhat 
ir FF 
iree V bIsL t " ? r ° Wth rate ' Tbis P atter " was apparent in oui sampled 
jrs.- 
apply to most ? trees. ' S pattern he,d true for our hickories and seems to 
