Vo 1. 19, No. 12 
Page 2 
the early mowing index (MWRL 19(8):1, Table 2) suggests. The number of hatched 
roadside nests annually eliminated by early mowing will be considered in next 
month's newsletter. 
Table 1. Phenology of the hatch of pheasant nests on FCMU roadsides, 1973-76. 
June 
July 
7 
15 
21 
30 
7 15 21 
31 
Percentage of 
nests hatched 
by above date 
3.5 
12 . 1 
27.6 
48.3 
67.3 81.0 90.5 
96,6 
Table 2. Percentage of roadsides unmowed through 1 August and 
percentage of 
roadside nesting potential real 
1 ized, 
FCMU, 1970-76. 
Year 
1970 
1971 
1972 1973 
1974 
1975 
1976 
Percentage of roadsides 
unmowed th_rough 
1 August (X = 76.4) 7 I .9 
81.0 
78.4 89 .O 
87 .O 
63 .O 
64.4 
Percentage of nesting 
potentia 1 rea 1 ized — 
(X = 82.5) 38.3 
86.4 
83.6 93.4 
77-1 
72.8 
75.8 
a 
—Annual percentage of nesting potential realized equals the summation of 
the percentage of total nests hatched on roadsides during the period X the percentage 
of roadsides unmowed through the period for four periods ending 15 June, 30 June, 
15 July, and 31 July. 
Ecology and Management of Squir re 1s q . Nixon, 
S. P. Havera 
Food and the availability of sites for nesting are probably the most 
important limiting factors in a wild squirrel population. However, there are 
limits imposed on population size by the social relationships among members 
