Appendix A. Statistical results for the effects of endophyte treatment on tree abundance at the bottomland site.
Results of repeated-measures ANOVA examining the effects of the endophyte treatment (fixed), block (random), and year (repeated) on the total number of individual trees per plot and the number of each of the three most common species: box elder, silver maple, and red osier dogwood. P values < 0.05 appear in boldface type.
Total number
Box elder number
Silver maple number
Red osier dogwood number
Effect
df
F
P
F
P
F
P
F
P
Endophyte
1,12
12.3
0.004
9.6
0.009
5.9
0.032
6.2
0.028
Block
1,12
0.1
0.768
0.4
0.556
12.9
0.004
12.3
0.004
Endophyte × block
1,12
2.5
0.142
2.5
0.137
4.5
0.055
1.5
0.250
Year
1,12
17.3
0.001
6.7
0.024
0.0
0.882
1.1
0.309
Year × endophyte
1,12
0.4
0.540
0.4
0.526
25.8
<0.001
0.0
0.972
Year × block
1,12
18.1
0.001
7.6
0.017
0.2
0.645
0.6
0.451
Year × endophyte × block
1,12
5.7
0.035
0.2
0.664
16.1
0.002
0.0
0.972