Ecological Archives E088-026-A3

F. Leland Russell, Svata M. Louda, Tatyana A. Rand, and Steven D. Kachman. 2007. Variation in herbivore-mediated indirect effects of an invasive plant on a native plant. Ecology 88:413–423.

Appendix C. ANCOVA results for effects of Rhinocyllus conicus population size in the focal musk thistle patch and distance to the focal patch on R. conicus egg load on wavyleaf thistles.

Source Numerator df Denominator df
F
P
         
R. conicus population size
1
34.8
0.02
0.8901
Distance
3
90.3
23.35
<0.0001
R. conicus population size × distance
3
90.4
0.33
0.8061
Wavyleaf thistle size
1
1034
14.77
0.0001
Size × R. conicus population size
1
1033
0.20
0.6565
Size × distance
3
1030
1.93
0.1229
Size × R. conicus population size × distance
3
1030
0.77
0.5133

 

 
   FIG. C1. Mean number of Rhinocyllus conicus egg cases per wavyleaf thistle (Cirsium undulatum) flower head for sites with low vs. high adult R. conicus population size in focal musk thistle patches.


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